Wireless Communications

Publications


Summary:


 

  • 6 Patents

 

  • 2 Books and 2 Chapters in Edited Books

 

  • 100 Papers in Journals or Conferences (more than 25 Invited Papers)

 


Patents:


 

  1. D. MANTEUFFEL, A. BAHR, J. BARO: Integrierte Antenne für Mobilfunktelefone. German Patent Office, File 100 22 107.6, München, 8. Mai 2000

  2. A. BAHR, D. MANTEUFFEL, J. BARO: Antennenanordnung für Mobiltelefone. German Patent Office, File 100 50 902.9, München, 13. Oktober 2000

  3. A. BAHR, D. MANTEUFFEL, J. BARO: Antennenanordnung für Mobilfunktelefone. German Patent Office, File 100 29 733.1, München, 23. Juni 2000

  4. D. MANTEUFFEL: Integrierte Dreiband Antenne. German Patent Office, File 101 37 946.3, München, 7. August 2001

  5. A. BAHR, D. MANTEUFFEL, J. BARO: Antenna arrangement for mobile radiotelephones. United States Patent US 6,542,126; Assignee: Alcatel; Filed: June 8, 2001; Published: April 1, 2003

  6. A. BAHR, D. MANTEUFFEL, J. BARO: Integrated antenna for mobile telefones. United States Patent US 6,473,044; Assignee: Alcatel; Filed: May 7, 2001; Published: October 29, 2002

 


Books:


 

  1. F. GUSTRAU, D. MANTEUFFEL: EM Modeling of Antennas and RF Components for Wireless Communication Systems – A Practical Guide. Series: Signals and Communication Technology, ISBN 3-540-28614, Springer, April 2006
  2. D. MANTEUFFEL: UWB Antenna Elements for Consumer Electronic Applications. Chaper in: E. Okon, B. Allen, W. Malik, D. Edwards, A. Brown (Editors): Ultra Wideband: Antennas and Propagation for Communication, Radar and Imaging. ISBN 0-470-03255-3, JOHN WILEY & SONS, LTD., September 2006 
  3. M. Grimm and D. Manteuffel, Antennas and Propagation for On-, Off- and In-Body Communications, in R.S. Thomä, H.I. Willms, T. Zwick, R. Knöchel, and J. Sachs, UKoLoS – Ultra-Wideband Radio Technologies for Communications, Localization and Sensor Applications, InTech, 2013, ch. 7

  4. D. Manteuffel, Netzwerkanalyse, LuLu Press, October 2013

 


Journal and Conference Papers:


 

2016

  1. D. Manteuffe and R. Martens, "Compact Multi Mode Element Antenna for Indoor UWB Massive MIMO," Antennas and Propagation, IEEE Transaction on, (under review), 2016.
    [Abstract]
     
    In this paper we present a concept for a compact ultra wideband multi element antenna for massive MIMO indoor base stations. The antenna concept is based on the simultaneous excitation of different Characteristic Modes on each element of the multi element antenna. This enables an effective 484 port antenna using only 121 physical antenna elements. Thereby a size reduction of 54 % compared to a generic multi element antenna based on crossed dipoles is achieved. The antenna operates in the ultra wide frequency band of 6 GHz – 8.5 GHz with a reflection coefficient of sii <  10dB and the inter element and intra element mutual coupling of the antenna ports is sji ≤ -20 dB.
    [BibTeX]
     
    @ARTICLE{6977911,
    
    
    author={D. Manteuffel and R. Martens},
    
      journal={Antennas and Propagation, IEEE Transactions on}, 
    
     title={Compact Multi Mode Element Antennas for Indoor UWB Massive MIMO}, 
    
      year={2016},
    
      month={Jun},
    
      volume={99},
    
      number={99},
    
      pages={1-2},
    
      keywords={},
    
      doi={},
    
      ISSN={},}

  2. E. Safin and D. Manteuffel, "Advanced Eigenvalue Tracking of Characteristic Modes," Antennas and Propagation, IEEE Transaction on, accepted for publication, 2016.
    [Abstract]
     

    Eigenvalue tracking is a serious issue in the calculation of characteristic modes over a wide frequency range. Two commonly used algorithms in this regard are investigated and the drawbacks that typically occur during eigenvalue tracking are explained. We discuss the effect of the degraded modes in detail. A new algorithm is presented, which overcomes these drawbacks in an innovative way. The new algorithm is explained in detail and investigated with respect to its numeric stability. A rectangular plate is used as a generic example to evaluate the tracking algorithms. Finally, a fractal antenna is evaluated as an advanced example.

    [BibTeX]
     
    @ARTICLE{6977911,
    
    
    author={E. Safin and D. Manteuffel},
    
      journal={Antennas and Propagation, IEEE Transactions on}, 
    
     title={Advanced Eigenvalue Tracking of Characteristic Modes}, 
    
      year={2016},
    
      month={Jun},
    
      volume={99},
    
      number={99},
    
      pages={1-2},
    
      keywords={Antenna theory; Eigenvalue and eigenfunctions; Tracking},
    
      doi={},
    
      ISSN={},}

  3. D. Manteuffel, N. Doose, and P. A. Hoeher, "Evaluation of a compact antenna concept for UWB massive MIMO," in Proc. German Microwave Conf. (GeMiC), accepted for publication, Bochum, Mar. 2016.

 

2015

  1. Y. Chen, R. Martens, R. Valkonen, and D. Manteuffel, "Evaluation of Adaptive Impedance Tuning for Reducing the Form Factor of Handset Antennas", Antennas and Propagation, IEEE Transactions on., vol.63, no.2, pp.703-710, Feb. 2015. [accepted versionDOI 
    [Abstract]
     
    In this paper, we evaluate adaptive impedance tuning in combination with intrinsically unmatched antennas in order to reduce the form factor of handset antennas. Thereby, we are able to shrink the size of an antenna element by a factor of four compared to an intrinsically broadband matched antenna while maintaining a similar total efficiency in usage scenarios. The antenna concept is based on an unmatched coupling element in order to obtain a flat impedance behavior, which is relatively insensitive to the user interaction. It enables a broadband adaptive matching by a tunable Pi -section network using varactors. The network takes into account the parasitic effects of the impedance detector and the ESD protection circuit.
    [BibTeX]
     
    @ARTICLE{6977911,
    
    
    author={Y. Chen, R. Martens, R. Valkonen, and D. Manteuffel},
    
      journal={Antennas and Propagation, IEEE Transactions on}, 
    
     title={Evaluation of Adaptive Impedance Tuning for Reducing the Form Factor of Handset Antennas}, 
    
      year={2015},
    
      month={Feb},
    
      volume={63},
    
      number={2},
    
      pages={703-710},
    
      keywords={Antenna measurements;Broadband antennas;Broadband 
    communication;Capacitors;Impedance;Inductors;Antenna form 
    factor;impedance matching;mobile antennas;user interaction},
    
      doi={10.1109/TAP.2014.2378288},
    
      ISSN={0018-926X},}
  2. D. Manteuffel, ”Characteristic Modes – An Intuitive Approach for Antenna Design”, Computational Electromagnetics (ICCEM), 2015 IEEE International Conference on, Hong Kong, pp.8-9, Feb. 2015.
  3. D. Manteuffel, ”Compact Multi Mode Massive MIMO Antennas”, Antenna Technology (iWAT), 2015 International Workshop on, Seoul, South Korea, March 2015.
  4. E. Safin, R. Valkonen, and D. Manteuffel, "Reconfigurable LTE MIMO Automotive AntennaSystem Based on the Characteristic Mode Analysis", in Antennas and Propagation (EUCAP), 2015 9th European Conference on., Lisbon, Portugal, April 12-17, 2015.
  5. R. Martens, and D. Manteuffel, "Optimal Placement of PCB-integrated Diversity Elements in a Compact Tunable Handset Antenna", in Antennas and Propagation (EUCAP), 2015 9th European Conference on., Lisbon, Portugal, April 12-17, 2015.
  6. T. Hadamik, R. Martens, and D. Manteuffel, "A Design Concept for Massive MIMO Indoor Base Stations using the Theory of Characteristic Modes", in Antennas and Propagation (EUCAP), 2015 9th European Conference on., Lisbon, Portugal, April 12-17, 2015.
  7. D. Manteuffel, ”Characteristic Mode based antenna design – a straight forward approach to small form factor antenna integration”, in Antennas and Propagation (EUCAP), 2015 9th European Conference on., Lisbon, Portugal, April 12-17, 2015.
  8. E. Safin, and D. Manteuffel, "Manipulation of Characteristic Wave Modes by Impedance Loading," Antennas and Propagation, IEEE Transactions on., vol.63, no.4, pp.1756-1764, April 2015. [accepted version] DOI 
    [Abstract]
     
    The influence of the antenna impedance loading on the characteristic wave modes is investigated and evaluated. It is shown that the eigenvalue behavior of the characteristic modes can be modified by impedance loading at specific positions on the antenna. Thereby, it is possible to manipulate certain modes such that they resonate in the desired frequency band. These modes can then effectively be excited to achieve the desired antenna performance. It is found that using characteristic wave modes leads to better intuitive insight compared to the entire current distribution. Furthermore, we present a definition of the modal efficiency of the characteristic modes, which can be used to take into account the effect of losses in the matching components or the load elements.
    [BibTeX]
     
    @ARTICLE{7035016,
    
    
    author={E. Safin and D. Manteuffel},
    
      journal={Antennas and Propagation, IEEE Transactions on}, 
    
     title={Manipulation of Characteristic Wave Modes by Impedance Loading}, 
    
      year={2015},
    
      month={April},
    
      volume={63},
    
      number={4},
    
      pages={1756-1764},
    
      keywords={antennas;eigenvalues and eigenfunctions;antenna 
    impedance loading;antenna performance;characteristic wave mode 
    manipulation;characteristic wave modes;eigenvalue behavior;frequency 
    band;impedance loading;load elements;Current distribution;Eigenvalues 
    and eigenfunctions;Impedance;Loaded antennas;Loading;Resonant 
    frequency;Surface impedance;Antenna theory},
    
      doi={10.1109/TAP.2015.2401586},
    
      ISSN={0018-926X},}
  9. M. Grimm and D. Manteuffel, "On-Body Far Field Description by two Equivalent Electric Sources", Antennas and Propagation Society International Symposium (APSURSI), 2015 IEEE, Vancouver, Canada, pp.1068-1069, 19-24 July 2015. DOI
  10. M. Grimm and D. Manteuffel, "On-Body Antenna Parameters," Antennas and Propagation, IEEE Transactions on, vol. 63, no. 12, pp. 5812-5821, September 2015. (accepted version DOI 
    [Abstract]
     

    Within the scope of on-body communications an approach is presented which is capable to describe the radiated on-body field of arbitrarily shaped antenna structures. The method is based on a segmentation of the excited current distribution on the antenna body by a finite number of small electric dipoles. To consider the presence of the human body, which affects the underlying radiation mechanism significantly, the model is implemented by the use of the Norton surface wave theory. Based thereon, a method is presented to model the onbody far field of an antenna by two equivalent electric dipoles, a TM and a TE source. Based on this assumption the directivity and the effective antenna area are defined for on-body propagation scenarios. The radiation characteristic of body worn antennas is discussed in terms of their radiation characteristic using the example of tilted half-wave dipoles and a planar inverted-F antenna. The last part of the study discusses a pathloss model which is calculated from the underlying antenna parameters. Numerical full-wave simulations, based on the FDTD method, and measurements in an anechoic chamber, verify the results.

    [BibTeX]
     
    @ARTICLE{7277023,
    
    
    author={M. Grimm and D. Manteuffel},
    
      journal={Antennas and Propagation, IEEE Transactions on}, 
    
     title={On-Body Antenna Parameters}, 
    
      year={2015},
    
      volume={63},
    
      number={12},
    
      pages={5812-5821},
    
      keywords={Antenna theory;Dipole antennas;Mathematical 
    model;Optical surface waves;Surface impedance;Surface waves;Body area 
    networks;antenna theory;on-body directivity;on-body propagation;wearable
     antennas},
    
      doi={10.1109/TAP.2015.2482499},
    
      ISSN={0018-926X},
    
      month={},}

 

2014

  1. M. Grimm and D. Manteuffel, "Norton Surface Waves in the Scope of Body Area Networks," Antennas and Propagation, IEEE Transactions on, vol.62, no.5, pp.2616-2623, May 2014. [accepted version DOI 
    [Abstract]
     
    This paper presents an evaluation on how Norton surface waves can be used to analytically model the on-body propagation in wireless body area networks. Based on a brief review of the Norton surface wave theory the general problem as defined for terrestrial propagation by Sommerfeld is unified taking into account the further extensions by Norton and Bannister which motivates its evaluation for on-body propagations. A discussion of Sommerfeld's numerical distance reveals useful properties to evaluate the capability of a certain configuration to excite Norton surface waves in specific on-body scenarios. Based thereon antenna design guidelines for on-body propagation links can be derived. All investigations are carried out for human muscle, skin and fat tissues in the frequency range from 0.4 GHz to 60 GHz. A comparison of the simplified model consisting of a planar homogeneous ground to a realistic inhomogeneous human body model shows good results for the attenuation of the electric field strength along the on-body path.
    [BibTeX]
     
    @ARTICLE{6746004,
    
    
    author={M. Grimm and D. Manteuffel},
    
      journal={Antennas and Propagation, IEEE Transactions on}, 
    
     title={Norton Surface Waves in the Scope of Body Area Networks}, 
    
      year={2014},
    
      month={May},
    
      volume={62},
    
      number={5},
    
      pages={2616-2623},
    
      doi={10.1109/TAP.2014.2307347},
    
      ISSN={0018-926X},}
  2. D. Manteuffel, "Towards Analytic Path Loss Models in On-Body Wireless Communications", Antenna Technology (iWAT), 2014 International Workshop on, pp. 296-296, 4-6 March 2014.
  3. R. Martens and D. Manteuffel, "Systematic Design Method of a Mobile Multiple Antenna System Using the Theory of Characteristic Modes," IET Microwaves, Antennas & Propagation, Volume 8, Issue 12, 16. Sept. 2014, pp. 887 – 893. DOI
    [Abstract]
     
    In this study, the authors present a systematic design method of a three-port multiple-input–multiple-output antenna system for small terminals, such as smart phones based on the selective excitation of orthogonal chassis modes. The underlying idea is based on the theory of characteristic modes (TCM). Selective excitation of these modes is realised by sets of non-resonant inductive coupling elements integrated at predefined positions into the printed circuit board (PCB) layout. Stripline feed networks also integrated within the multi-layer PCB layout care for a good impedance match to 50 Ω. The design method of this antenna system is a straight forward application of the TCM and is therefore of general interest for the design of small terminal antennas. Furthermore, owing to the electrically small couplers that require only limited area at the outer edge of the PCB the method represents an interesting solution with the clear potential to be extended to more ports. The realised prototype resembles the predicted performance very well and therefore proves the applicability of the proposed method.
    [BibTeX]
     
    @ARTICLE{6898908,
    
    
    author={R. Martens and D. Manteuffel},
    
      journal={Microwaves, Antennas   Propagation, IET}, 
    
     title={Systematic design method of a mobile multiple antenna system using the theory of characteristic modes}, 
    
      year={2014},
    
      month={Sept},
    
      volume={8},
    
      number={12},
    
      pages={887-893},
    
      doi={10.1049/iet-map.2013.0534},
    
      ISSN={1751-8725},}
  4. Y. Chen, R. Martens, R. Valkonen, and D. Manteuffel, "A Varactor-Based Tunable Matching Network for a Non-Resonant Mobile Terminal Antenna", in Antennas and Propagation (EUCAP), 2014 8th European Conference on., The Hague, The Netherlands, April 6-11, 2014, pp. 2225-2229.
  5. E. Safin and D. Manteuffel, "Influence of the Impedance Matching on the Characteristic Wave Modes", in Antennas and Propagation (EUCAP), 2014 8th European Conference on., The Hague, The Netherlands, April 6-11, 2014, pp. 1323-1327.
  6. M. Grimm and D. Manteuffel, "Far Field Modeling of Body Worn Antennas by the Superposition of Equivalent Electric Sources", in Antennas and Propagation (EUCAP), 2014 8th European Conference on., The Hague, The Netherlands, April 6-11, 2014, pp. 1754-1755
  7. R. Valkonen, A. Lehtovuori, and D. Manteuffel, "Capacitive coupling elements – changing the way of designing antennas," in Antennas and Propagation (EUCAP), 2014 8th European Conference on., The Hague, The Netherlands, April 6-11, 2014, pp. 209-213.
  8. R. Martens and D. Manteuffel, "Mobile LTE-A Handset Antenna Using a Hybrid Coupling Element", Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE, Memphis, US, July 2014, pp. 1419-1420.
  9. T. Hadamik, R. Martens, and D. Manteuffel, „Systematic Broadband Multiport Antenna Design based on a Characteristic Mode Analysis," COST IC1102, 6. WG Meeting & Technical Workshop 2014, Madrid, October 2014.
  10. M. Grimm and D. Manteuffel, "Body Worn Antenna Systems for Health Care related On- and Off-body Communications", 4th International Conference von Wireless Mobile Communication and Healthcare, Athens, Greece, pp. 203-206, 3-5 Nov. 2014. DOI
  11. R. Martens, Y. Chen, and D. Manteuffel, "Tunability Comparsion of a Capacitive Coupling Element and a Planar Inverted-F Antenna," LAPC 2014 - Loughborough Antennas and Propagation Conference, Loughborough University, UK, November 2014, pp. 667-668.

 

2013

  1. Y. Chen and D. Manteuffel, "Miniaturizing of a Distributed MEMS Impedance Matching Network,", Antenna Technology (iWAT), 2013 International Workshop on , vol., no., pp.303,306, 4-6 March 2013. DOI 
    [Abstract]
     
    This paper shows a Micro-Electro-Mechanical-Systems (MEMS) impedance matching network based on a distributed MEMS transmission line (DMTL) for wireless communication devices operating in the frequency range from 1.8 GHz to 3.6 GHz. In the proposed design, the capacitive MEMS switches are periodically located on a meandered slow-wave (SW) structure, whose slow wave effect is analytically calculated to reduce the minimum operating frequency of the network. Using this demonstrated transmission line, the size of the impedance matching network is minimized while providing a good impedance matching performance in terms of impedance coverage on the Smith chart.
    [BibTeX]
     
    @INPROCEEDINGS{6518353,
    author={Y. Chen and D. Manteuffel},
    booktitle={Antenna Technology (iWAT), 2013 International Workshop on},
    title={Miniaturizing of a distributed MEMS impedance matching network},
    year={2013},
    pages={303-306},
    keywords={impedance matching;microswitches;radiocommunication;
    slow wave structures;transmission lines;DMTL;SW structure;
    Smith chart;capacitive MEMS switches;distributed MEMS impedance matching network;
    distributed MEMS transmission line;frequency 1.8 GHz to 3.6 GHz;
    impedance coverage;impedance matching performance;
    meandered slow-wave structure;microelectro-mechanical-system;
    slow wave effect;wireless communication device},
    doi={10.1109/IWAT.2013.6518353},
    }

  2. E. Safin and D. Manteuffel, "Resonance Behaviour of Characteristic Modes Due to the Presence of Dielectric Objects", In Antennas and Propagation (EUCAP), 2013 7th European Conference on., April 2013.
    [Abstract]
     
    In this paper we present a modal analysis of dielectric bodies of arbitrary shape. The problem of a dielectric body is reformulated into equivalent electric and magnetic surface currents. Using the weighed eigenvalue equation the characteristic modes of the equivalent problem are calculated. A physical interpretation of the eigenvalue of the dielectric characteristic modes is presented and discussed.

  3. M. Grimm and D. Manteuffel, "Discussion of Body Worn Dipole Antennas Based on an Improved De-embedding Approach", In Antennas and Propagation (EUCAP), 2013 7th European Conference on., April 2013.
    [Abstract]
     
    This paper presents a structured analyses of the radiation characteristic of body worn antennas. Based on a given de-embedding approach the theory is analyzed and extended in terms of arbitrary antenna orientations. In conjunction with this theory the applied far field model is verified and the on-body directivity is discussed as function of frequency, effective height and polarization.

  4.  R. Martens and D. Manteuffel, "Improved Radiation Pattern Measurements of MIMO Handheld Mobile Terminals", In Antennas and Propagation (EUCAP), 2013 7th European Conference on., April 2013.
    [Abstract]
     
    In this paper we report on our experience made when measuring different radiation patterns of a multi-antenna handheld terminal. In order to avoid unwanted effects from surface waves on a connecting cable we equipped the terminal with a programmable wireless transmit module. Parasitic effects due to the presence of the device holder of the positioner in the anechoic chamber are analyzed by numerical simulations resulting in recommendations for optimal positioning. }

  5. E. Safin and D. Manteuffel, "Reconstruction of the Characteristic Modes on an Antenna Based on the Radiated Far Field,", Antennas and Propagation, IEEE Transactions on , vol.61, no.6, pp.2964-2971, June 2013. [accepted versionDOI 
    [Abstract]
     
    In this paper, we present a method to reconstruct the modal current distribution on an antenna from the radiated far field and general knowledge about the modes involved. The method leads to good results if the radiation mechanism of the antenna can be approximated by the current distribution on a simplified structure. The current distribution of the simplified structure is decomposed into its characteristic modes and the related modal far field is calculated. Assuming that the far field of the actual antenna contains the same modes, their weighting coefficients are calculated by comparing the far field of the actual antenna to the modal far field of the simplified structure. It can be shown that the weighting coefficients of all significant modes can be reconstructed with good accuracy even for complex real structures such as mobile phones.
    [BibTeX]
     
    @ARTICLE{6473830,
    author={E. Safin and D. Manteuffel},
    journal={Antennas and Propagation, IEEE Transactions on},
    title={Reconstruction of the Characteristic Modes on an Antenna Based on the Radiated Far Field},
    year={2013},
    volume={61},
    number={6},
    pages={2964-2971},
    abstract={In this paper, we present a method to reconstruct the modal current distribution on an antenna from the radiated far field and general knowledge about the modes involved. The method leads to good results if the radiation mechanism of the antenna can be approximated by the current distribution on a simplified structure. The current distribution of the simplified structure is decomposed into its characteristic modes and the related modal far field is calculated. Assuming that the far field of the actual antenna contains the same modes, their weighting coefficients are calculated by comparing the far field of the actual antenna to the modal far field of the simplified structure. It can be shown that the weighting coefficients of all significant modes can be reconstructed with good accuracy even for complex real structures such as mobile phones.},
    keywords={Antennas;Correlation;Current distribution;Eigenvalues and eigenfunctions;Equations;Mathematical model;Surface impedance;Antenna radiation pattern;antenna theory;eigenvalues and eigenfunctions;mobile antennas;numerical analysis},
    doi={10.1109/TAP.2013.2251312},
    ISSN={0018-926X},},
    }

  6. E. Safin, R. Martens, M. Capek, J. Eichler, P. Hazdra, D. Manteuffel, and M. Mazanek, "Discussion and Evaluation of Modal and Radiation Q-Factors for MIMO Antennas Based on Theory of Characteristic Modes", COST IC1102, 3. WG Meeting & Technical Workshop 2013, Thessaloniki, June, 2013. DOI
    [Abstract]
     
    The effort to integrate one or more antennas (e.g. for the realization of a MIMO antenna systems) in a small terminal is a challenge that is barely to cope. Due to the spatial limited structure some antenna performance measures, such as the Q-factor is affected by the integration impairments of the small terminal. The TCM (Theory of Characteristic Modes) provides one possible approach in order to understand the impact of the small terminal and the effects on the overall radiation. The experiences of CAU (Kiel) are related to the selective excitation of modes concerning MIMO applications and CTU Prague has a fundamental knowledge on the Q-factor calculation. Both participants (CAU and CTU Prague) have developed different in-house tools to calculate the characteristic modes of a radiating structure. The combination of both inhouse tools can be used to characterize the entire performance (Q-factor) of the MIMO antennas based on the TCM.
    [BibTeX]
     
    author={E. Safin, R. Martens, M. Capek, J. Eichler, P. Hazdra, D. Manteuffel, and M. Mazanek},
      booktitle={COST IC1102, 3. WG Meeting & Technical Workshop 2013},  
      title={Discussion and Evaluation of Modal and Radiation Q-Factors for MIMO Antennas Based on Theory of Characteristic Modes},
      year={2013},
      month={June},
      volume={},
      number={},
      pages={},
      keywords={},
      doi={},
      ISSN={},}

  7. T. Hadamik, R. Martens, and D. Manteuffel, "Comparison of Two Matching Networks for a LTE2600 Handset Antenna," LAPC 2013 - Loughborough, Antennas and Propagation Conference, Loughborough University, UK, November 2013. DOI
    [Abstract]
     
    In this paper two different concepts of matching networks for a LTE2600 handset antenna based on non-resonant coupling elements are investigated. The matching circuits are realized in stripline and lumped element technology. A comparison shows that both concepts offer similar results in terms of the power gain. However the realization using lumped elements offers advantages with respect to the complexity and the small form factor.
    [BibTeX]
     
    author={T. Hadamik, R. Martens, and D. Manteuffel},
      booktitle={LAPC 2013 - Loughborough Antennas and Propagation Conference},  
      title={Discussion and Evaluation of Modal and Radiation Q-Factors for MIMO Antennas Based on Theory of Characteristic Modes},
      year={2013},
      month={November},
      volume={},
      number={},
      pages={},
      keywords={},
      doi={},
      ISSN={},}
  8. R. Martens, J. Holopainen, E. Safin, and D. Manteuffel, "Small Terminal Multi-Antenna System Based on Two Different Types of Non-Resonant Coupling Elements", COST IC1102, 4. WG Meeting & Technical Workshop 2013, Ghent, Sept. 2013. DOI
    [Abstract]
     
    This paper introduces a 2.6-GHz MIMO antenna system for mobile terminals. The antenna
    structures consists of a broadband main antenna (operation frequencies 0.7-0.96 and 1.7-3.5 GHz),
    and a secondary 2.6-GHz MIMO antenna. The main antenna consists of a traditional monopole-type
    capacitive coupling element (CCE) placed at the end of the terminal, and the secondary MIMO
    antenna consists of two out-of-phase fed inductive coupling elements (ICE) placed on the long edges
    of the chassis.
    A Characteristic Mode [1] analysis using an in-house software [2] shows that the operation of the CCE
    at the low-band is based on the effective excitation of the lowest-order (half-wave) characteristic
    wavemode of the chassis, which radiates more than 90% of the total radiation of the main antenna
    below 1 GHz. Furthermore, the location of the feeding pin was optimized in such a way that it creates
    two self-resonances at the higher band. Then, the secondary MIMO antenna is designed in such a way
    that it does not excite effectively the dominant wavemodes of the main antenna structure. Five of the
    most dominant characteristic wavemodes excited by the main antenna at 2.6 GHz. Those five modes
    are responsible for up to 80% of the total radiation of the main antenna. The remaining 20% is
    radiated by the "minor" characteristic modes, from which the sixth mode radiates 6%, the seventh 3%,
    the eighth 1%, and the rest modes less than 1% each. As a general finding it can be concluded that the
    characteristic modes of the chassis are significantly affected by the loading caused by the different
    coupling elements and has to be taken into account in the optimization of the overall sytem.
    Both coupling elements require additional matching networks to be matched to 50 Ω in the desired
    frequency bands. In addition the set of inductive couplers requires a feed network combining its
    elements and adjusting their phased excitation. The impedance matching for the main (CCE) antenna
    is implemented with the help of a dual-resonant matching circuitry for the low-band operation (LB),
    and with the combination of the L-section matching circuitry and self-resonances for the high-band
    operation (HB).
    Low antenna-to-antenna coupling as well as a low envelope correlation of the antenna trasfer
    functions can be obtained due to the concept based on orthogonal wave mode excitation. However,
    the matching networks degrade the radiation efficiency of the antennas. It can be observed that this is
    less severe for the capacitive coupling element using low cost SMD elements.
    [BibTeX]
     
    author={R. Martens, J. Holopainen, E. Safin, and D. Manteuffel},
      booktitle={COST IC1102, 4. WG Meeting & Technical Workshop 2013},  
      title={Small Terminal Multi-Antenna System Based on Two Different Types of Non-Resonant Coupling Elements},
      year={2013},
      month={Sept.},
      volume={},
      number={},
      pages={},
      keywords={},
      doi={},
      ISSN={},}
  9. R. Martens, D. Manteuffel, and P. A. Höher, "Ultra Wideband Communications based on Massive MIMO and Multi-mode Antennas Suitable for Handheld Devices - A Project Outlock", Workshop Proceedings of the 43. European Microwave Conference, "Ultra High Speed Wireless Communications: Approaches and Ideas to Achieve Wireless 100Gb/s Communication", EuMW 2013, Nuremberg, Oct. 2013. DOI
    [Abstract]
     

    Ultra-high-speed wireless communications with peak data rates of 100 Gbps and beyond, as targeted in the DFG research focus area SPP 1655, requires an ultra-wide signal bandwidth in conjunction with suitable antennas and advanced baseband processing techniques to increase spectral efficiency and power efficiency simultaneously. In this project proposal, additional constraints arise as our focus is on low-cost low-complexity miniature consumer electronic devices, such as ultrabooks, tablet PCs or smart phones. Both downlink and uplink will be studied, and limited mobility shall be supported. Emphasis is on indoor scenarios.

    In order to achieve these goals, interdisciplinary research shall be conducted in the area of antenna design and baseband processing. We concentrate on the frequency range of 6.0 - 8.5 GHz, where the spectral mask is most relaxed in Europe (-41.3 dBm/MHz EIRP). Hence, a spectral efficiency of at least 40 bps/Hz must be achieved, with is a rather challenging goal with respect to miniature devices.

    There are two main key concepts to achieve this goal: A novel antenna design and an advanced signal processing concept called massive MIMO.  Concerning the antenna design, the new feature is that multiple modes can be activated per antenna element.  Each mode owns an individual antenna port. Hence, many antenna ports can be realized given just a few antenna elements. This concept can be integrated well into miniature devices and it is easily reconfigurable.

    Concerning baseband processing, the main focus is on a transmitter design supporting the flexibility offered by the antennas, as well as an advanced, highly parallel receiver design enabling low-cost implementation.  The limited EIRP, the demanding bandwidth efficiency, as well as the small size and limited computational complexity of the mobile terminal are among the biggest challenges. In massive MIMO, the access point (AP) is equipped with a vast number of antenna elements, whereas the terminal is equipped with a single antenna, preferably.

    UWB massive-MIMO MB-OFDM with transmitter-side beamforming shall be addressed for the downlink. Assuming for example an array with 5 x 5 antenna elements as a design guideline, each supporting 5 modes, 125 antenna ports will result at the AP. In the uplink, UWB massive-MIMO MB-OFDM with diversity reception shall be investigated. On the terminal side, one antenna element with 5 modes will result in 5 antenna ports. In this interdisciplinary approach targeting ultra-high bandwidth efficiencies, the first three project years will focus on fundamental questions.
  10. T. Metzger, T. Ebefors, M. Pudas, A. Haapalinna, R. Martens, T. Lisec, "RF Solutions for Future Generation Mobile Phones," European Nanoelectronics Forum, Barcelona, November 2013. DOI
  11. R. Martens, J. Holopainen, E. Safin, J. Ilvonen, and D. Manteuffel, "Optimal Dual-Antenna Design in a Small Terminal Multi-Antenna System," Antennas and Wireless Propagation Letters, IEEE , vol.12, no., pp.1700-1703, Dec. 2013. DOI 
    [Abstract]
     
    This letter introduces a novel 2.6-GHz multiple-input and multiple-output (MIMO) antenna system for mobile terminals. The antenna structures consist of a broadband main antenna covering most of the LTE-A bands, and a narrowband second antenna operating at the 2.6 GHz band. The main antenna is a traditional monopole-type capacitive coupling element (CCE) placed on the short edge of the terminal. The second antenna consists of two - out-of-phase fed inductive coupling elements (ICE) placed on the long edges of the chassis. The main purpose of the paper is to demonstrate that this kind of antenna system offers good performance in terms of electromagnetic (EM) isolation and envelope correlation between the antennas. This has been experimentally verified and is originated on the fact that both antennas excite effectively different orthogonal wavemodes, which is studied with the help of the theory of characteristic wavemodes.
    [BibTeX]
     
    @null{6692896,
    author={R. Martens, and J. Holopainen, and E. Safin, J. Ilvonen, and D. Manteuffel},
    journal={Antennas and Wireless Propagation Letters, IEEE}, 
    title={Optimal Dual-Antenna Design in a Small Terminal Multi-Antenna System}, 
    year={2014},
    volume={PP},
    number={99},
    pages={1-1},
    abstract={This letter introduces a novel 2.6-GHz multipleinput and
    multiple-output (MIMO) antenna system for mobile terminals. The antenna
    structures consist of a broadband main antenna covering most of the 
    LTE-A bands, and a narrowband second antenna operating at the 2.6 GHz 
    band. The main antenna is a traditional monopole-type capacitive 
    coupling element (CCE) placed on the short edge of the terminal. The 
    second antenna consists of two - out-of-phase fed inductive coupling 
    elements (ICE) placed on the long edges of the chassis. The main purpose
    of the paper is to demonstrate that this kind of antenna system offers 
    good performance in terms of electromagnetic (EM) isolation and envelope
    correlation between the antennas. This has been experimentally verified
    and is originated on the fact that both antennas excite effectively 
    different orthogonal wavemodes, which is studied with the help of the 
    theory of characteristic wavemodes.},
    keywords={Capacitive coupling element;MIMO;characteristic modes theory;inductive coupling element;mobile antennas;multi-antenna system},
    doi={10.1109/LAWP.2013.2296147},
    ISSN={1536-1225},}

2012

  1. D. Manteuffel and M. Grimm, "Localization of a functional capsule for wireless neuro-endoscopy", In Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS), 2012 IEEE Topical Conference on., jan., 2012. , pp. 61 -64. DOI
    [Abstract]
     
    In this paper we present a numerical evaluation of a RF localization system to determine the position of a functional radio capsule released in the ventricular system of the brain. The concept is based on an AoA estimation using short UWB pulses. Although first results are quite stimulating, the initial localization accuracy is too poor for practical applications. It has been shown that this is mainly cause by NLoS waves reaching certain reference stations faster than waves travelling along the desired LoS path due to significant higher phase velocities in the cranial bone or the sinus cavities compared to the different types of brain matter.
    [BibTeX]
     
    @inproceedings{6172735,
      author = {D. Manteuffel and M. Grimm},
      title = {Localization of a functional capsule for wireless neuro-endoscopy},
      booktitle = {Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS), 2012 IEEE Topical Conference on},
      year = {2012},
      pages = {61 -64},
      doi = {10.1109/BioWireless.2012.6172735}
    }

  2. R. Martens and D. Manteuffel, "A feed network for the selective excitation of specific characteristic modes on small terminals", In Antennas and Propagation (EUCAP), 2012 6th European Conference on., march, 2012. , pp. 1842 -1846. DOI
    [Abstract]
     
    We investigate different strategies to realize a feed network for a set of ICEs (Inductive Coupling Elements) on a small terminal for the selective excitation of characteristic modes. The inductive excitation is realized by embedding small rectangular loops into the PCB (Printed Circuit Board) of the terminal. Due to the small dimensions of the ICEs the input impedance of the elements is highly reactive. Therefore, additional matching networks are required. The trade-offs of lumped elements versus distributed transmission lines to match and combine the elements of each set of couplers are investigated. An important result obtained is that the feed network with double-stub tuning offers advantages compared to the feed network with lumped SMD (Surface Mountable Device) components with respect to the efficiency of the entire antenna systems.
    [BibTeX]
     
    @inproceedings{6205813,
      author = {R. Martens and D. Manteuffel},
      title = {A feed network for the selective excitation of specific characteristic modes on small terminals},
      booktitle = {Antennas and Propagation (EUCAP), 2012 6th European Conference on},
      year = {2012},
      pages = {1842 -1846},
      doi = {10.1109/EuCAP.2012.6205813}
    }

  3. E. Safin, R. Martens, and D. Manteuffel, "Modal source reconstruction based on radiated far-field for antenna design", In Antennas and Propagation (EUCAP), 2012 6th European Conference on., march, 2012. , pp. 1645 -1649. DOI
    [Abstract]
     
    We present a mathematical technique to reconstruct the modal current distribution on arbitrary antennas from the radiated far-field and general knowledge about the modes involved. The method leads to good results if the radiation mechanism of the actual antenna can be approximated by the current distribution on a simplified structure. The current distribution of the simplified structure is decomposed into its characteristic modes and the related modal far-field is calculated. Assuming that the far-field of the actual antenna contains the same modes, their weighting coefficients are calculated by comparing the far-field of the actual antenna to the modal far-field of the simplified structure. It can be shown that the weighting coefficients of all significant modes can be reconstructed with good accuracy.
    [BibTeX]
     
    @inproceedings{6205814,
      author = {E. Safin, R. Martens, and D. Manteuffel},
      title = {Modal source reconstruction based on radiated far-field for antenna design},
      booktitle = {Antennas and Propagation (EUCAP), 2012 6th European Conference on},
      year = {2012},
      pages = {1645 -1649},
      doi = {10.1109/EuCAP.2012.6205814}
    }

  4. M. Grimm and D. Manteuffel, "Evaluation of the Norton equations for the development of body-centric propagation models", In Antennas and Propagation (EUCAP), 2012 6th European Conference on., march, 2012. , pp. 311 -315. DOI
    [Abstract]
     
    This paper presents a structured evaluation of the Norton equations to describe the propagation of electromagnetic waves along the human body surface. In conjunction with this theory an antenna de-embedding of dipole antennas is proposed and a simple pathloss channel model for a vertical and horizontal orientated half-wave dipole in close proximity to a homogeneous phantom is developed. Furthermore the influence of the air-phantom boundary is verified to show different physical propagation conditions which should be considered for future antenna design approaches.
    [BibTeX]
     
    @inproceedings{6206051,
      author = {M. Grimm and D. Manteuffel},
      title = {Evaluation of the Norton equations for the development of body-centric propagation models},
      booktitle = {Antennas and Propagation (EUCAP), 2012 6th European Conference on},
      year = {2012},
      pages = {311 -315},
      doi = {10.1109/EuCAP.2012.6206051}
    }

  5. D. Manteuffel and M. Grimm, "On- and in-body path loss models based on antenna de-embedding", In International Conference on Electromagnetics in Advanced Applications - Antennas and Propagation in Wireless Communications 2012 (ICEAA-IEEE APWC 2012). Cape Town, South Africa, September, 2012.
    [BibTeX]
     
    @inproceedings{,
      author = {D. Manteuffel and M. Grimm},
      title = {On- and in-body path loss models based on antenna de-embedding},
      booktitle = {International Conference on Electromagnetics in Advanced Applications - Antennas and Propagation in Wireless Communications 2012 (ICEAA-IEEE APWC 2012)},
      year = {2012},
      note = {publication}
    }

  6. R. Martens  and D. Manteuffel, "3-Port MIMO Antenna based on the Selective Excitation of Characteristic Modes on Small Terminals", COST IC1102, 2. WG Meeting & Technical Workshop 2012. Istanbul, September, 2012. DOI
    [Abstract]
     
    This contribution presents a 3-port MIMO (Multiple Input Multiple Output) antenna concept for small terminals, such as smart phones based on the selective excitation of orthogonal chassis modes. The underlying idea is based on the TCM (Theory of Characteristic Modes). Selective excitation of these modes is realized by sets of non-resonant inductive coupling elements integrated at predefined positions into the PCB (Printed Circuit Board) layout. Stripline feed networks, also integrated within the multi-layer PCB layout care for a good impedance match to 50 Ω. The concept presents a straight forward application of the TCM and is therefore of general interest for the design of small terminal antennas. Furthermore, due to the electrically small couplers that require only limited area at the outer edge of the PCB the concept represents an interesting solution with the clear potential to be extended to more ports. The realized prototype resembles the predicted performance very well and therefore proves the applicability of the proposed concept.
    [BibTeX]
     
    @INPROCEEDINGS{6393889,
    author={R. Martens and D. Manteuffel},
      booktitle={COST IC1102, 2. WG Meeting & Technical Workshop 2012},  
      title={3-Port MIMO Antenna based on the Selective Excitation of Characteristic Modes on Small Terminals},
      year={2012},
      month={Sept.},
      volume={},
      number={},
      pages={},
      keywords={},
      doi={},
      ISSN={},}
  7. D. Manteuffel and R. Martens, "Multiple Antenna Integration in Small Terminals", In ISAP 2012 - International Symposium on Antennas and Propagation 2012., pp. 211 - 224  Oct/Nov, 2012. DOI
    [Abstract]
     
    The Theory of Characteristic Modes (TCM) can be effectively used for the realization of both, multistandard antennas and multiport antenna systems on small terminal platforms. For multistandard applications simultaneous excitation of multiple modes is desired while multiport antenna systems for MIMO require the selective excitation of orthogonal modes. Both cases require different coupling strategies. Capacitive couplers enable the simultaneous excitation of modes while inductive coupling elements provide advantages with respect to the selective excitation.
    [BibTeX]
     
    @INPROCEEDINGS{6393889,
    author={D. Manteuffel and R. Martens},
      booktitle={Antennas and Propagation (ISAP), 2012 International 
    Symposium on},  title={Multiple antenna integration in small terminals},
      year={2012},
      month={29 2012-nov. 2},
      volume={},
      number={},
      pages={211 -214},
      keywords={Couplings;Eigenvalues and eigenfunctions;Mobile antennas;Mobile communication;Standards;},
      doi={},
      ISSN={},}
  8. D. Manteuffel, "Small Terminal Antenna Concepts for Reconfigurable MIMO Handsets", Antennas and Propagation (APCAP), 2012 IEEE Asia-Pacific Conference on , vol., no., pp.15,16, 27-29 Aug. 2012 DOI
    [Abstract]
     
    This paper presents a concept for reconfigurable MIMO antennas for future mobile handsets. The concept is based on the excitation of characteristic modes on the terminal chassis. Thereby it enables a compact antenna solution that utilizes the entire chassis as the antenna. Two types of coupling structures for either selective or combined excitation of different modes are discussed. Reconfigurable tuning networks enable multi-mode and multi-standard applications.
    [BibTeX]
     
    @INPROCEEDINGS{6333125,
    author={D. Manteuffel},
    booktitle={Antennas and Propagation (APCAP), 2012 IEEE Asia-Pacific Conference on},
    title={Small terminal antenna concepts for reconfigurable MIMO handsets},
    year={2012},
    pages={15-16},
    keywords={MIMO communication;antenna arrays;mobile handsets;characteristic excitation mode;compact antenna solution;coupling structure;multimode application;multistandard application;reconfigurable MIMO antenna;reconfigurable MIMO handset;reconfigurable tuning network;small terminal antenna concept;terminal chassis;Couplings;MIMO;Mobile antennas;Mobile handsets;Characteristic Modes;LTE;MIMO;Small terminal antenna},
    doi={10.1109/APCAP.2012.6333125},}

  9. R. Martens and D. Manteuffel, "2-Port Antenna Based on the Selective Excitation of Characteristic Modes", Antennas and Propagation Society International Symposium (APSURSI), 2012 IEEE , vol., no., pp.1-2, 8-14 July 2012. DOI
    [Abstract]
     
    In this paper we present a two-port MIMO (Multiple Input Multiple Output) - antenna based on the selective excitation of two orthogonal modes on a small terminal. The concept applies the TCM (Theory of Characteristic Modes). The excitation of the chassis modes are realized by two sets of ICEJn (Inductive Coupling Elements) at predefined positions on a commonly used PCB. Feed Networks (FNJn) care for a good impedance match to 50 Ohm with double-stub tuning and phase shifters realized in stripline technology. Numerical results show a good de-correlation of the antenna ports and a high quality of mode excitation.
    [BibTeX]
     
    @inproceedings{,
      author = {R. Martens and D. Manteuffel},
      title = {2-Port Antenna Based on the Selective Excitation of Characteristic Modes},
      booktitle = {APS 2012 - IEEE International Symposium on Antennas and Propagation 2012},
      year = {2012},
      note = {accepted for Publication}
    }

  10. Y. Chen and D. Manteuffel, "Distributed MEMS Impedance Matching Network Using a SW-DGS Technique", In Antennas and Propagation Conference (LAPC), 2011 Loughborough., nov., 2011. , pp. 1 -4. DOI 
    [Abstract]
     
    A novel distributed Micro-Electro-Mechanical-Systems (MEMS) impedance matching network is presented in this paper. This impedance matching network is based on DMTL (Distributed MEMS transmission line) having periodically loaded MEMS switches on a coplanar waveguide (CPW) transmission line. In order to miniaturize the physical size of the DMTL, a combination of a slow-wave (SW) structure and defect-ground-structure (DGS) is utilized. As a result, the distribution of the impedance coverage on the Smith chart can be improved for the limited physical length or reducing its size for a certain desired impedance distribution can be achieved. The parameter values of the equivalent circuit of the proposed structure are extracted from numerical simulation results using the FDTD simulator EMPIRE and are implemented for the calculation the uniformity factor to describe the uniformity of the impedance distribution on the Smith chart.
    [BibTeX]
     
    @INPROCEEDINGS{6402950,
    author={Y. Chen and D. Manteuffel},
      booktitle={Antennas and Propagation Conference (LAPC), 2012 
    Loughborough},  title={Distributed MEMS impedance matching network using
     a SW-DGS technique}, 
      year={2012},
      month={nov.},
      volume={},
      number={},
      pages={1 -4},
      keywords={DGS;DMTL;Impedance matching network;MEMS;SW line;SW-DGS-DMTL;SW-DMTL;},
      doi={10.1109/LAPC.2012.6402950},
      ISSN={},}

2011

  1. D. Manteuffel and R. Martens, "A concept for MIMO antennas on small terminals based on characteristic modes", In Antenna Technology (iWAT), 2011 International Workshop on., march, 2011. , pp. 17 -20. DOI
    [Abstract]
     
    In this paper, we present a concept for a MIMO antenna system on a small terminal platform. The concept is based on the selective excitation of different orthogonal characteristic modes on the chassis of the small terminal. Thereby the chassis of the mobile terminal itself can be effectively used as the MIMO antenna similar to the concept commonly applied to single port (single mode) antennas on mobile terminals. The different modes generate orthogonal radiation patters and are therefore suited to radiate de-correlated signals fed to the different antenna ports. Such modes can be excited selectively by certain sets of couplers distributed around the outer edges of the chassis. First stage numerical investigations show that coupling between the modes is low.
    [BibTeX]
     
    @inproceedings{5752386,
      author = {D. Manteuffel and R. Martens},
      title = {A concept for MIMO antennas on small terminals based on characteristic modes},
      booktitle = {Antenna Technology (iWAT), 2011 International Workshop on},
      year = {2011},
      pages = {17 -20},
      doi = {10.1109/IWAT.2011.5752386}
    }

  2. D. Manteuffel, P. A.  Hoeher, and M. Mehdorn, "Evaluation of RF localization for deep brain implants", In Antennas and Propagation (EUCAP), Proceedings of the 5th European Conference on., april, 2011. , pp. 2372 -2376. DOI
    [Abstract]
     
    This paper presents first results of an advanced study based on numerical simulations concerning the applicability of RF techniques for the localization of functional medical probes located in the ventricular system of the brain. The functional implant contains a dipole antenna that transmits short pulses in the frequency range of 3.1 lt;; f[GHz] lt;; 5.1. The localization concept is based on angle of arrival determination at several reference stations located around the skull of the phantom. The investigation of three test cases shows that the accuracy is significantly impaired if the spherical wave front is overlapped by a guided wave in the bone layer of the skull. Reasonable localization accuracy can be achieved if the reference stations are located at positions where the skull bone is thin.
    [BibTeX]
     
    @inproceedings{5781910,
      author = {D. Manteuffel, P.A. Hoeher, and M. Mehdorn},
      title = {Evaluation of RF localization for deep brain implants},
      booktitle = {Antennas and Propagation (EUCAP), Proceedings of the 5th European Conference on},
      year = {2011},
      pages = {2372 -2376}
    }

  3. R. Martens, E. Safin, and D. Manteuffel, "Selective excitation of characteristic modes on small terminals", In Antennas and Propagation (EUCAP), Proceedings of the 5th European Conference on., april, 2011. , pp. 2492 -2496. DOI
    [Abstract]
     
    In this paper we present a concept for the selective excitation of different orthogonal modes of a small terminal chassis. The concept can be used to realize an efficient multi port antenna system in order to enable MIMO (Multiple Input Multiple Output) for small terminals. The idea is based on the TCM (Theory of Characteristic Modes). The selective excitation of these modes is achieved by sets of couplers that are located at specific positions on the terminals' PCB (Printed Circuit Board). Passive matching circuits care for a good impedance match to 50 #x03A9;. As a result it is demonstrated that nearly perfect de-correlation of the ports of the multi antenna system can be achieved.
    [BibTeX]
     
    @inproceedings{5782054,
      author = {R. Martens, E. Safin, and D. Manteuffel},
      title = {Selective excitation of characteristic modes on small terminals},
      booktitle = {Antennas and Propagation (EUCAP), Proceedings of the 5th European Conference on},
      year = {2011},
      pages = {2492 -2496}
    }

  4. M. Grimm and D. Manteuffel, "Characterization of electromagnetic propagation effects in the human head and its application to Deep Brain Implants", In Antennas and Propagation in Wireless Communications (APWC), 2011 IEEE-APS Topical Conference on., sept., 2011. , pp. 674 -677. DOI
    [Abstract]
     
    This paper discusses the characterization of electromagnetic propagation effects in the human head by means of the FDTD method and analytical models. The findings are used to describe and improve the RF localization of Deep Brain Implants. Despite the inhomogeneous tissue distribution in the brain the propagation in the inner brain structure can be approximated by a spherical wave. On the other hand the transition into the airy material of the skull bone and the sinus leads to reflections and perturbation of the spherical wave front. A guided wave is excited that travels along the skull bone and causes inaccuracies for the Angle of Arrival estimation at the outer reference stations.
    [BibTeX]
     
    @inproceedings{6046792,
      author = {M. Grimm and D. Manteuffel},
      title = {Characterization of electromagnetic propagation effects in the human head and its application to Deep Brain Implants},
      booktitle = {Antennas and Propagation in Wireless Communications (APWC), 2011 IEEE-APS Topical Conference on},
      year = {2011},
      pages = {674 -677},
      doi = {10.1109/APWC.2011.6046792}
    }

  5. R. Martens, E. Safin, and D. Manteuffel, "Inductive and capacitive excitation of the characteristic modes of small terminals", In Antennas and Propagation Conference (LAPC), 2011 Loughborough., nov., 2011. , pp. 1 -4. DOI
    [Abstract]
     
    In this paper we present concepts for the selective excitation of orthogonal modes of small terminals by inductive and capacitive coupling elements. The concepts can be used to implement an efficient MIMO (Multiple Input Multiple Output) antenna system based on the TCM (Theory of Characteristic Modes). Both coupling concepts are discussed with respect to their ability to excite specific modes separately. An important result obtained is that inductive couplers offer advantages over capacitive couplers in exciting the desired modes purely even when they are not close to their modal resonance.
    [BibTeX]
     
    @inproceedings{6114141,
      author = {R. Martens, E. Safin, and D. Manteuffel},
      title = {Inductive and capacitive excitation of the characteristic modes of small terminals},
      booktitle = {Antennas and Propagation Conference (LAPC), 2011 Loughborough},
      year = {2011},
      pages = {1 -4},
      doi = {10.1109/LAPC.2011.6114141}
    }

2010

  1. C. Luxey and D. Manteuffel, "Highly-efficient multiple antenna-systems for small MIMO devices", In Antenna Technology (iWAT), 2010 International Workshop on., march, 2010. , pp. 1 -6. DOI
    [Abstract]
     
    In this paper, we focus on highly-efficient multiple antenna-systems for small MIMO communicating devices. First, we perform a state-of-the art review of the best solutions developed by various researchers. Then we consider some fundamental aspects involved when integrating multiple antennas in a small terminal. Thereafter, we present several multiple antenna-systems designed at the LEAT of the University of Nice-Sophia Antipolis since 2004. We especially describe our neutralization technique dedicated to enhance the total efficiency of several radiators when they are closely placed over the same small ground plane. Last, we try to identify promising solutions and future trends.
    [BibTeX]
     
    @inproceedings{5464856,
      author = {C. Luxey and D. Manteuffel},
      title = {Highly-efficient multiple antenna-systems for small MIMO devices},
      booktitle = {Antenna Technology (iWAT), 2010 International Workshop on},
      year = {2010},
      pages = {1 -6},
      doi = {10.1109/IWAT.2010.5464856}
    }

  2. R. Martens and D. Manteuffel, "Element correlation of MIMO antennas on small terminals", In Antennas and Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference on., april, 2010. , pp. 1 -5. DOI
    [Abstract]
     
    This paper aims at investigating some significant integration aspects involved in daily practical mobile terminal design and their impact on the correlation coefficient of multiple antenna elements. While the antenna elements itself are kept as simple as possible the influence of its location on the terminal platform is investigated systematically. The investigations show, that the influence of the integration is significant on the one hand. On the other hand the general physical behaviour can be easily estimated and can also be used to find simple design rules for closely spaced de-correlated antennas on small terminals.
    [BibTeX]
     
    @inproceedings{5505858,
      author = {R. Martens and D. Manteuffel},
      title = {Element correlation of MIMO antennas on small terminals},
      booktitle = {Antennas and Propagation (EuCAP), 2010 Proceedings of the Fourth European Conference on},
      year = {2010},
      pages = {1 -5}
    }

  3. M. Grimm and D. Manteuffel, "Electromagnetic wave propagation on human trunk models excited by half-wavelength dipoles", In Antennas and Propagation Conference (LAPC), 2010 Loughborough., nov., 2010. , pp. 493 -496. DOI
    [Abstract]
     
    This paper presents a numerical analysis (FDTD) of the electromagnetic wave propagation mechanism at f = 2.45 GHz around the human trunk. Different body models starting from planar models, to cylindrical models up to realistic trunk models are considered. In addition homogeneous and inhomogeneous model structures are compared with each other. For excitation a half-wavelength dipole in close proximity to the models is used in both tangential and normal orientation to the body. As a result of reflection and diffraction of the model the main propagation mechanism can be shown to be a surface wave which can be more effectively excited by a dipole in normal orientation to the body than in tangential orientation. In case of the curved trunk model the surface wave can be used to illuminate the non line of sight region e.g. in the back of the human body. However, the superposition of the two waves creeping from both sides around the body can lead to a standing wave profile in this region.
    [BibTeX]
     
    @inproceedings{5666198,
      author = {M. Grimm and D. Manteuffel},
      title = {Electromagnetic wave propagation on human trunk models excited by half-wavelength dipoles},
      booktitle = {Antennas and Propagation Conference (LAPC), 2010 Loughborough},
      year = {2010},
      pages = {493 -496},
      doi = {10.1109/LAPC.2010.5666198}
    }

  4. R. Martens, E. Safin, and D. Manteuffel, "On the relation between the element correlation of antennas on small terminals and the characteristic modes of the chassis", In Antennas and Propagation Conference (LAPC), 2010 Loughborough., nov., 2010. , pp. 457 -460. DOI
    [Abstract]
     
    In this paper we present some basic investigations to show the relation between the element correlation of antennas on a common small terminal and the characteristic modes on the chassis excited by those antennas. The results show, that the characteristic of an antenna array is heavily affected by the weighted characteristic current modes of the chassis. The actual mode and its weight, however, depend on the dimensions of the chassis and the locations of the antenna elements for a given frequency. In case of a two antenna systems the effect of the common ground plate on the element correlation can be minimized by locating the antennas in such a way that both excite the same mode 180 #x00B0; out of phase.
    [BibTeX]
     
    @inproceedings{5666206,
      author = {R. Martens, E. Safin, and D. Manteuffel},
      title = {On the relation between the element correlation of antennas on small terminals and the characteristic modes of the chassis},
      booktitle = {Antennas and Propagation Conference (LAPC), 2010 Loughborough},
      year = {2010},
      pages = {457 -460},
      doi = {10.1109/LAPC.2010.5666206}
    }

  5. D. Manteuffel, M. Grimm, and R. Martens, "Optimization of ultrawideband bow-tie antennas for cable based operation", In Antennas and Propagation Conference (LAPC), 2010 Loughborough., nov., 2010. , pp. 585 -588. DOI
    [Abstract]
     
    In this paper we present the design and optimization of an ultrawideband bow-tie antenna for the operations on top of a coaxial cable. The shape of the antenna is derived from canonical analytic equations. In order to reduce parasitic currents on the shielding of the cable caused by the unbalanced transition between the unsymmetric coaxial feed and the symmetric planar radiator the lower plate of the bow-tie is designed to operate as a sleeve in addition. The antenna is shown to be less sensitive to the coaxial cable compared to simple configurations without the sleeve. The study is based on numerical simulations using the FDTD simulator EMPIRETM.
    [BibTeX]
     
    @inproceedings{5666903,
      author = {D. Manteuffel, M. Grimm, and R. Martens},
      title = {Optimization of ultrawideband bow-tie antennas for cable based operation},
      booktitle = {Antennas and Propagation Conference (LAPC), 2010 Loughborough},
      year = {2010},
      pages = {585 -588},
      doi = {10.1109/LAPC.2010.5666903}
    }

  6. D. Manteuffel, T. Ould, and T. Kempka, "Antenna and propagation impairments of a UWB localization system integrated into an aircraft cabin", In Antennas and Propagation Conference (LAPC), 2010 Loughborough., nov., 2010. , pp. 589 -592. DOI
    [Abstract]
     
    In this paper we discuss some antenna and propagation aspects involved with the development of a localization system based on Ultra WideBand (UWB) technology intended for the integration into an aircraft cabin. The reference station consists of a pair of UWB monopoles that are integrated into the ceiling of the cabin. The integration is realized in a way to generate a directive down-tilted antenna pattern in order to illuminate the aisle of the cabin. The UWB radio channel of the cabin is characterized using a commercial ray tracing software. The influence of the antennas and the channel on the received pulse shape at the reference station launched by a mobile transmitter in the aisle of the cabin is investigated.
    [BibTeX]
     
    @inproceedings{5666904,
      author = {D. Manteuffel, T. Ould, and T. Kempka},
      title = {Antenna and propagation impairments of a UWB localization system integrated into an aircraft cabin},
      booktitle = {Antennas and Propagation Conference (LAPC), 2010 Loughborough},
      year = {2010},
      pages = {589 -592},
      doi = {10.1109/LAPC.2010.5666904}
    }

2009

  1. D. Manteuffel, M. Arnold, Y. Makris, and Z.-N. Chen, "Concepts for future multistandard and ultra wideband mobile terminal antennas using multilayer LTCC technology", In Antenna Technology, 2009. iWAT 2009. IEEE International Workshop on., march, 2009. , pp. 1 -4. DOI
    [Abstract]
     
    Some key aspects of two different concepts of configurable antennas for future mobile terminal have been addressed in this paper. It has been shown that a coupling element in combination with a configurable tuning circuit can be used to excite the chassis of the mobile terminal to act as the entire antenna in many different frequency bands. However, when both the coupling element and the tuneable circuit elements are combined in a compact LTCC antenna component the achievable antenna efficiency is quite weak. A different concept that allows for broadband matching and better efficiency has been designed for UWB. The antenna is capable of retuning the antenna to different platforms of a mobile terminal just by slightly changing the footprint of the antenna component on the PCB. Future work will focus e.g. on evaluating how electronic switching (either pin diodes or MEMS switches) can be used to make the antenna concepts reconfigurable.
    [BibTeX]
     
    @inproceedings{4906972,
      author = {D. Manteuffel, M. Arnold, Y. Makris, and Zhi-Ning Chen},
      title = {Concepts for future multistandard and ultra wideband mobile terminal antennas using multilayer LTCC technology},
      booktitle = {Antenna Technology, 2009. iWAT 2009. IEEE International Workshop on},
      year = {2009},
      pages = {1 -4},
      doi = {10.1109/IWAT.2009.4906972}
    }

  2. D. Manteuffel and M. Arnold, "Considerations on configurable multi-standard antennas for mobile terminals realized in LTCC technology", In Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on., march, 2009. , pp. 2541 -2545. DOI
    [Abstract]
     
    In this paper we present part of a long term research project that aims on designing a (re-)configurable multistandard antenna element for 4G (4^th Generation) mobile terminals based on LTCC (low temperature co-fired ceramic) technology. The antenna itself is a coupling element that efficiently excites the chassis of the mobile terminal to radiate as an entire antenna. Coupling is optimized by a reactive tuning circuit. Several of these tuning circuits are realized in a single LTCC component and can be multiplexed to the antenna by a SPnT (single pole n thru) antenna switch integrated into the LTCC component. The coils and capacitor in the LTCC component are configurable on the top-layer of the component. Thus, the component is configurable according to different mobile terminal chassis configurations and multiple bands.
    [BibTeX]
     
    @inproceedings{5068132,
      author = {D. Manteuffel and M. Arnold},
      title = {Considerations on configurable multi-standard antennas for mobile terminals realized in LTCC technology},
      booktitle = {Antennas and Propagation, 2009. EuCAP 2009. 3rd European Conference on},
      year = {2009},
      pages = {2541 -2545}
    }

  3. D. Manteuffel, "MIMO antenna design challenges", In Antennas Propagation Conference, 2009. LAPC 2009. Loughborough., nov., 2009. , pp. 50 -56. DOI
    [Abstract]
     
    This paper provides a brief introductions into the challenges involved when designing antenna for MIMO (Multiple Input Multiple Output) systems on small terminals. The investigation is based on the fundamental parameter of cross-correlation of the antenna transfer functions. Some considerations on the correlation of antennas implemented on small terminals are undertaken. It is shown that the correlation of the elements of a multiple antenna system which is implemented on a small terminal is significantly affected by the integration impairments and the platform itself.
    [BibTeX]
     
    @inproceedings{5352587,
      author = {D. Manteuffel},
      title = {MIMO antenna design challenges},
      booktitle = {Antennas Propagation Conference, 2009. LAPC 2009. Loughborough},
      year = {2009},
      pages = {50 -56},
      doi = {10.1109/LAPC.2009.5352587}
    }

  4. P. Uhlig, M. Geissler, S. Holzwarth, J. Leiss, D. Manteuffel, and M. Martinez-Vauzquez, "Antenna Concepts for Ceramic Multilayer Modules", In IMAPS/ACerS 5th International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies (CICMT). Denver, Colorado, USA, April, 2009.
    [BibTeX]
     
    @inproceedings{,
      author = {P. Uhlig, M. Geissler, S. Holzwarth, J. Leiss, D. Manteuffel, and M. Martinez-Vauzquez},
      title = {Antenna Concepts for Ceramic Multilayer Modules},
      booktitle = {IMAPS/ACerS 5th International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies (CICMT)},
      year = {2009}
    }

1997 - 2008

 
  1. P. Uhlig, D. Manteuffel, and S. Malkmus: “High Layer Count in LTCC Dual Band Antenna for Galileo GNSS“ IMAPS/ACerS 4th International Conference and Exhibition on Ceramic Interconnect and Ceramic Microsystems Technologies (CICMT) Munich, April 21 - 24, 2008.

  2. M. Arnold and D. Manteuffel, "Method to optimize a tuning network for mobile terminal antennas", In Antennas and Propagation Conference, 2008. LAPC 2008. Loughborough., march, 2008. , pp. 237 -240. DOI
    [Abstract]
     
    In this paper we present a method to optimize a tuning circuit for an electrically small antenna with regard to the total efficiency (matching and losses) of the entire system consisting of antenna and tuning network. The method aims on optimizing the throughput through the tuning network rather than optimizing only the matching to the 50 Omega transceiver module. This is especially important for small antennas with a small radiation resistance which might be in the order of the parasitic loss components of the lumped SMA tuning elements. Furthermore, the proposed method is developed in a way that does not require measurements of the radiated power of the antenna after each optimization step in order derive the radiated efficiency of the entire system. The method is validated and tested in designing a FM radio antenna integrated into a mobile terminal. Regarding the fact that this is a paper which is about fundamentals we use a 50 Omega source at FM radio frequencies.
    [BibTeX]
     
    @inproceedings{4516910,
      author = {M. Arnold and D. Manteuffel},
      title = {Method to optimize a tuning network for mobile terminal antennas},
      booktitle = {Antennas and Propagation Conference, 2008. LAPC 2008. Loughborough},
      year = {2008},
      pages = {237 -240},
      doi = {10.1109/LAPC.2008.4516910}
    }


  3. D. Manteuffel and M. Arnold, "Considerations for Reconfigurable Multi-Standard Antennas for Mobile Terminals", In Antenna Technology: Small Antennas and Novel Metamaterials, 2008. iWAT 2008. International Workshop on., march, 2008. , pp. 231 -234. DOI
    [Abstract]
     
    Tomorrows mobile terminals shall be multi-standard platforms for various kinds of wireless applications. So far, nowadays mobiles consist of a combination of different separated modules e.g. for GSM, for Bluetooth, WLAN, etc.. Along with these different modules typically separated antennas are use, such as one for GSM/UMTS and another one for Bluetooth and yet another one for FM radio. Currently the design is heading towards multi-standard RF modules that combine several standards or operate on the principle of a software defined radio. Hence, an ubiquitous antenna module that can be attached to such a multi-standard module is required. However, different to the software algorithms and the integrated circuitries, an antenna is still bound to its physical size in terms of wavelength in order to operate efficiently. As the operating frequency of the applications under discussion range from approx. 100 MHz to 2.5 GHz standard antenna concepts for mobile terminals cannot be use because of the large bandwidth and the physical antenna size at low frequencies. The research presented in this paper intends to analyze basic requirements for such an antenna module to operate sufficiently and to propose an applicable concept under the typical constraints of consumer electronic applications and mass production issues.
    [BibTeX]
     
    @inproceedings{4511325,
      author = {D. Manteuffel and M. Arnold},
      title = {Considerations for Reconfigurable Multi-Standard Antennas for Mobile Terminals},
      booktitle = {Antenna Technology: Small Antennas and Novel Metamaterials, 2008. iWAT 2008. International Workshop on},
      year = {2008},
      pages = {231 -234},
      doi = {10.1109/IWAT.2008.4511325}
    }


  4. Maci, S., Lindmark, B., Freni, A., Breinbjerg, O., Raisanen, A., Laheurte, J.-M., Mahdjoubi, K., Frezza, F., Vecchi, G., Jofre, L., Perez, M., Ferrando, M., Kildal, P., Skrivervik, A., Gerini, G., Dubard, J., Casali, B., Manteuffel, D., Bucciu, O., Wiesbeck, W., Mazanek, M., Sipus, Z., Hall, P. and Ibars, C. , "The European School of Antennas: Results and Perspectives", In Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on., nov., 2007. , pp. 1 -6. DOI
    [Abstract]
     
    The European School of Antennas (ESoA) is a new model of geographically-distributed school that has the objective to reinforce the European training and research in antennas and relevant applications. This paper presents the objective and perspectives of ESoA and the results obtained in 2006 and the first part of 2007 in terms of flow of students and teachers.
    [BibTeX]
     
    @inproceedings{4458248,
      author = {Maci, S. and Lindmark, B. and Freni, A. and Breinbjerg, O. and Raisanen, A. and Laheurte, J.-M. and Mahdjoubi, K. and Frezza, F. and Vecchi, G. and Jofre, L. and Perez, M.S. and Ferrando, M. and Kildal, P.S. and Skrivervik, A. and Gerini, G. and Dubard, J.L. and Casali, B. and Manteuffel, D. and Bucciu, O. and Wiesbeck, W. and Mazanek, M. and Sipus, Z. and Hall, P. and Ibars, C.},
      title = {The European School of Antennas: Results and Perspectives},
      booktitle = {Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on},
      year = {2007},
      pages = {1 -6}
    }


  5. Makris, I., Manteuffel, D. and Seager, R. , "Miniaturized reconfigurable UWB antennas for the integration into consumer electronic products", In Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on., nov., 2007. , pp. 1 -6. DOI
    [Abstract]
     
    The emphasis of this research was to reduce the development cost of an antenna by investigating simple minimal cost external adjustments [5] to the antenna, in order to target a range of integration scenarios. The antenna integration is critical for low cost production as the antenna characteristics are hugely affected by its environment. The key point for low cost antenna integration is to make the antenna as insensitive as possible to its environment. This research reports cost effective techniques to reconfigure external UWB antennas when it is necessary. Embedding UWB antennas in packages using technologies like Low Temperature Co-fired Ceramic (LTCC) can provide advantage in reaching this goal. The main technological advantage of this approach is the ability to include lumped elements in the multilayer structure that allow simple, low cost, realistic reconfigurable antennas (easy tuning or re-tuning the antenna) for different applications (PDA, DVD player, etc). This yields a UWB antenna which is volume efficient and is, effectively, insensitive to its environment when integrated into different consumer electronic products.
    [BibTeX]
     
    @inproceedings{4458966,
      author = {Makris, I. and Manteuffel, D. and Seager, R.D.},
      title = {Miniaturized reconfigurable UWB antennas for the integration into consumer electronic products},
      booktitle = {Antennas and Propagation, 2007. EuCAP 2007. The Second European Conference on},
      year = {2007},
      pages = {1 -6}
    }


  6. Timmermann, J., Manteuffel, D. and Wiesbeck, W. , "Simulation of the Impact of Antennas and Indoor Channels on UWB Transmission by Ray Tracing and Measured Antenna Patterns", In Ultra-Wideband, 2007. ICUWB 2007. IEEE International Conference on., sept., 2007. , pp. 194 -197. DOI
    [Abstract]
     
    During the development stage of a UWB system, system simulations are helpful to evaluate the system performance. System simulations demand for accurate description and modeling of the entire system, whereas the computation time must be small. In many cases, system simulators are based on idealized assumptions and neglect effects of non-ideal hardware. In reality however, real UWB antennas can corrupt signal transmission. This paper presents a system simulator that can deal with non-ideal, measured complex antenna patterns. It is shown how antenna patterns impact signal transmission in typical indoor scenarios. To describe multipath propagation within small computation time, full-wave solutions of Maxwell's equations cannot be performed. Instead, a UWB Ray Tracing tool developed at the Institut fur Hochstfrequenztechnik und Elektronik is used and expanded by complex pattern information to take into account the influence of antennas. The system simulator determines the distorted signal and reconstructs the bit sequence by a conventional correlation receiver.
    [BibTeX]
     
    @inproceedings{4380940,
      author = {Timmermann, J. and Manteuffel, D. and Wiesbeck, W.},
      title = {Simulation of the Impact of Antennas and Indoor Channels on UWB Transmission by Ray Tracing and Measured Antenna Patterns},
      booktitle = {Ultra-Wideband, 2007. ICUWB 2007. IEEE International Conference on},
      year = {2007},
      pages = {194 -197},
      doi = {10.1109/ICUWB.2007.4380940}
    }


  7. Manteuffel, D., Ould-Mohamed, T.-A. and Romme, J. , "Impact of Integration in Consumer Electronics on the performance of MB-OFDM UWB", In Electromagnetics in Advanced Applications, 2007. ICEAA 2007. International Conference on., sept., 2007. , pp. 911 -914. DOI
    [Abstract]
     
    In this paper the effect of antenna integration in typical UWB consumer electronic products on the entire system performance is evaluated for a system model based on MB-OFDM. The antenna in its specific integration scenario is characterized by the full wave FDTD method. Different deterministic indoor channels are characterized using ray-tracing simulation. Based on the analysis the channel transfer function, including the antennas can be derived in terms of S-parameters. From the transfer function of the antennas and the channels different antenna and channel related measures like RMS delay spread or frequency depended radiation pattern are derived. In order to evaluate the impact on the entire link performance a MatLab Simulink model of a UWB system is used to model the entire system. The system related parameters like BER (Bit Error Rate) are evaluated with reference to different antenna integrations and link scenarios.
    [BibTeX]
     
    @inproceedings{4387453,
      author = {Manteuffel, D. and Ould-Mohamed, T.-A. and Romme, J.},
      title = {Impact of Integration in Consumer Electronics on the performance of MB-OFDM UWB},
      booktitle = {Electromagnetics in Advanced Applications, 2007. ICEAA 2007. International Conference on},
      year = {2007},
      pages = {911 -914},
      doi = {10.1109/ICEAA.2007.4387453}
    }


  8. Makris, I., Manteuffel, D., Seager, R. and Vardaxoglou, J. , "Modified Designs for UWB Planar Monopole Antennas", In Antennas and Propagation Conference, 2007. LAPC 2007. Loughborough., april, 2007. , pp. 249 -252. DOI
    [Abstract]
     
    This paper reports a theoretical study of a planar monopole antenna for use in the 3.1 GHz-10.6 GHz UWB band for later integration into consumer electronic products. Therefore the emphasis of the research is related to minimizing the size of the monopole while maintaining the matching in the desired frequency range. Simulations, using the Empire Software Suite, show that the impedance matched bandwidth (RL gt;10 dB) can be significantly increased by bevelling the bottom edge of the monopole and also the impedance match at the lower end of the band can be improved by judicious placement of a shorting pin. The use of a 1 mm wide shorting pin yields a structure that resembles a PIFA antenna. It is possible to treat the monopole antenna as a modified PIFA and apply transmission line theory to predicting the resonant frequencies and the return loss. A combination of shorting pin with bevel shows significant promise in the size reduction of the UWB antennas. The key point is the careful position of the shorting pin (with the bevel) on the monopole that to give a very good match through out the UWB band. This paper reports an investigation of the effect of the antenna dimensions (height, bevel angle and position of shorting pin) on its broad band response. The results of this study show that it is possible to reduce the size of the antenna elements significantly below lambda_max /4, when additional shorting pins are used on the antenna. The distributed shorting pins can be understood to work as a matching network for the antenna.
    [BibTeX]
     
    @inproceedings{4218511,
      author = {Makris, I. and Manteuffel, D. and Seager, R.D. and Vardaxoglou, J.C.},
      title = {Modified Designs for UWB Planar Monopole Antennas},
      booktitle = {Antennas and Propagation Conference, 2007. LAPC 2007. Loughborough},
      year = {2007},
      pages = {249 -252},
      doi = {10.1109/LAPC.2007.367476}
    }


  9. Manteuffel, D. , "Modelling and Visualisation of the Communication Link for UWB Consumer Applications", In Antennas and Propagation Conference, 2007. LAPC 2007. Loughborough., april, 2007. , pp. 33 -38. DOI
    [Abstract]
     
    This paper aims on visualising of the communication link for UWB consumer electronic applications. It is intended to introduce the aspects involved especially with the integration of the antenna into the chassis of the applications to the designers of the consumer electronic application that are typically not used to rf and antenna terminology. The complete chain of the communication link is modelled using numerical simulation. This includes the antenna functionality inside the chassis of the application and the wave propagation in a typical indoor environment. The use of numerical simulations provides the advantage of visualising the electromagnetic fields and offers often better insight into the behaviour of antennas and other rf components without detailed knowledge about electromagnetic theory.
    [BibTeX]
     
    @inproceedings{4218462,
      author = {Manteuffel, D.},
      title = {Modelling and Visualisation of the Communication Link for UWB Consumer Applications},
      booktitle = {Antennas and Propagation Conference, 2007. LAPC 2007. Loughborough},
      year = {2007},
      pages = {33 -38},
      doi = {10.1109/LAPC.2007.367427}
    }

  10. Manteuffel, D. , "Radio Link Characterization using Real Antenna Integration Scenarios for UWB Consumer Electronic Applications", In Ultra Wideband Systems, Technologies and Applications, 2006. The Institution of Engineering and Technology Seminar on., april, 2006. , pp. 123 -130. DOI
    [Abstract]
     
    The radio link performance of short range but high data rate UWB systems is affected by both the antennas and the channel. Both aspects have been widely investigated in related literature. With respect to the antenna it is often the goal to minimize the ringing to affect less the impulse radiation. Unfortunately, in most studies the antenna integration into the chassis of the specific application is not taken into account. Investigations in this paper show that the integration significantly affects e.g. the ringing of the antenna. In order to investigate the impact of this degradation on the radio link between different applications like DVD player and PDA in a typical indoor environment propagation modeling is performed. The results show that the delay spread of the channel dominates the performance of the entire radio link. The increased ringing due to the antenna integration adds only minor to the overall performance.
    [BibTeX]
     
    @inproceedings{4123627,
      author = {Manteuffel, D.},
      title = {Radio Link Characterization using Real Antenna Integration Scenarios for UWB Consumer Electronic Applications},
      booktitle = {Ultra Wideband Systems, Technologies and Applications, 2006. The Institution of Engineering and Technology Seminar on},
      year = {2006},
      pages = {123 -130}
    }


  11. D. MANTEUFFEL: Considerations on antennas and propagation aspects for UWB consumer applications. INVITED PAPER in: LAPC 2006 – Loughborough Antennas and Propagation Conference, Loughborough University, UK, April 2006.

  12. D. MANTEUFFEL: On the influence of antenna integration on the radio link of UWB systems for consumer equipment. In: AusWireless’06 Conference - First IEEE International Conference on Wireless Broadband and Ultra Wideband Communications, Sydney, Australia, March 2006.

  13. D. MANTEUFFEL: Analyse und Synthese von integrierten Antennen für Mobiltelefone. In der Rubrik: Ausgezeichnete Dissertationen der Zeitschrift: it- Information Technology Jahrgang 48 (2006) Heft 1, S. 60-64. Oldenburg Wissenschaftsverlag GmbH, München, ISSN 1611-2776.

  14. Beard, B., Kainz, W., Onishi, T., Iyama, T., Watanabe, S., Fujiwara, O., Wang, J., Bit-Babik, G., Faraone, A., Wiart, J., Christ, A., Kuster, N., Lee, A.-K., Kroeze, H., Siegbahn, M., Keshvari, J., Abrishamkar, H., Simon, W., Manteuffel, D. and Nikoloski, N. , "Comparisons of computed mobile phone induced SAR in the SAM phantom to that in anatomically correct models of the human head", Electromagnetic Compatibility, IEEE Transactions on., may, 2006. Vol. 48(2), pp. 397 - 407. DOI
    [Abstract]
     
    The specific absorption rates (SAR) determined computationally in the specific anthropomorphic mannequin (SAM) and anatomically correct models of the human head when exposed to a mobile phone model are compared as part of a study organized by IEEE Standards Coordinating Committee 34, Sub-Committee 2, and Working Group 2, and carried out by an international task force comprising 14 government, academic, and industrial research institutions. The detailed study protocol defined the computational head and mobile phone models. The participants used different finite-difference time-domain software and independently positioned the mobile phone and head models in accordance with the protocol. The results show that when the pinna SAR is calculated separately from the head SAR, SAM produced a higher SAR in the head than the anatomically correct head models. Also the larger (adult) head produced a statistically significant higher peak SAR for both the 1- and 10-g averages than did the smaller (child) head for all conditions of frequency and position.
    [BibTeX]
     
    @article{1634754,
      author = {Beard, B.B. and Kainz, W. and Onishi, T. and Iyama, T. and Watanabe, S. and Fujiwara, O. and Jianqing Wang and Bit-Babik, G. and Faraone, A. and Wiart, J. and Christ, A. and Kuster, N. and Ae-Kyoung Lee and Kroeze, H. and Siegbahn, M. and Keshvari, J. and Abrishamkar, H. and Simon, W. and Manteuffel, D. and Nikoloski, N.},
      title = {Comparisons of computed mobile phone induced SAR in the SAM phantom to that in anatomically correct models of the human head},
      journal = {Electromagnetic Compatibility, IEEE Transactions on},
      year = {2006},
      volume = {48},
      number = {2},
      pages = { 397 - 407},
      doi = {10.1109/TEMC.2006.873870}
    }


  15. D. MANTEUFFEL: Design and Optimization of UWB antennas integrated into the chassis of a DVD player. In: ANTEM 2005 - 11th Internationnal Symposium on Antenna Technology and Apply Electromagnetics, St. Malo, France, June 2005

  16. D. MANTEUFFEL: Considerations for the Design of UWB Antennas for Mobile and Consumer Equipment. INVITED PAPER in: ICT 2005 - 12th International Conference on Telecommunications, Cape Town, South Africa, Mai 2005. Reprint invited to the African Journal of ICT (AJICT), http://epress.lib.uts.edu.au/journals/ajict/, September 2005.

  17. M. ARNOLD, O. LITSCHKE, D. MANTEUFFEL: A Comparison of Three Methods to Determine the Efficiency of Terminal Antennas. LAPC 2005 – Loughborough Antennas and Propagation Conference, Loughborough University, UK, April 2005.

  18. D. MANTEUFFEL, W. SIMON: FDTD calculation of the SAR induced in the human head by mobile phones – new standards and procedures for the numerical assessment. INVITED PAPER in: IWAT2005 - IEEE International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, Singapore, March 2005.

  19. Manteuffel, D. , "FDTD characterization of UWB antennas for home-entertainment equipment with special emphasis on the specific integration scenario", In Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on., march, 2005. , pp. 351 - 354. DOI
    [Abstract]
     
    In this paper, a method for the efficient characterization of UWB antennas based on a combination of FDTD simulation and the Lorentz reciprocity principle is presented. In order to obtain a complete spatio-temporal characterization, the transmit transfer function (TF) of the antenna is first determined using an FDTD simulation of the nearfield scenario followed by a nearfield-to-farfield transformation. The application of the Lorentz reciprocity theorem then yields the receive TF. The TFs of the antenna allow the calculation of all quality measures of interest either in the frequency domain or the time domain (e.g. ringing or effective gain). Furthermore, as the TFs characterize completely the spatio-temporal behavior of the antenna they can be used as input data for propagation investigations in order to investigate the link between a transmitting and a receiving UWB system. The method is applied to a realistic example of a monocone antenna integrated in a canonical model of a DVD player. In addition, the link between the DVD player and a Vivaldi antenna is calculated for a simplified indoor scenario.
    [BibTeX]
     
    @inproceedings{1461089,
      author = {Manteuffel, D.},
      title = {FDTD characterization of UWB antennas for home-entertainment equipment with special emphasis on the specific integration scenario},
      booktitle = {Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on},
      year = {2005},
      pages = { 351 - 354},
      doi = {10.1109/IWAT.2005.1461089}
    }


  20. D. HEBERLING, D. MANTEUFFEL, M. MARTÍNEZ-VÁZQUEZ, M. GEISSLER, O. LITSCHKE: Small Antennas for Mobile and Ultra-Wideband Communication. INVITED PAPER in: JINA2004 – 13th International Symposium on Antennas, Nizza, Frankreich, November 2004.

  21. W. SIMON, A. LAUER, D. MANTEUFFEL, A. WIEN, I. WOLFF: Efficient FDTD Parallel Processing on Modern PC CPUs. INVITED PAPER in: EuroEM 2004 Conference, Magdeburg Germany, July 2004. Abstract in: Book of Abstracts p. 152; Full paper in 7th Ultra Wide Band – Short Pulse Electromagnetics Book (UWB SP 7), Chapter 16, pp. 131 – 134, ISBN 978-0-387-37728-5.

  22. D. MANTEUFFEL, J. KUNISCH, W. SIMON: Characterisation of UWB antennas by their spatio temporal transfer function based on FDTD simulations. INVITED PAPER in: EuroEM 2004 Conference, Magdeburg Germany, July 2004. Abstract in: Book of Abstracts pp. 177 – 178; Full paper in 7th Ultra Wide Band – Short Pulse Electromagnetics Book (UWB SP 7), Chapter 42, pp. 380 – 390, ISBN 978-0-387-37728-5.

  23. D. Manteuffel, F. Gustrau : EM Feldsimulationen in der Ingenieurausbildung und zur Entwicklung von Komponenten der Mobilfunktechnik. Eingeladener Beitrag zur: 9. ITG Fachtagung „Mobilfunk – Stand der Technik und Zukunftsperspektiven, Osnabrück, Juni 2004.

  24. Manteuffel, D. , "Numerical dosimetry", In Antenna Measurements and SAR, 2004. AMS 2004. IEE., may, 2004. , pp. 59 - 62. DOI
    [Abstract]
     
    Different European and international standards (e.g., ICNIRP guidelines, ANSI C95.1 standard, European Council Recommendation) define basic restrictions and reference levels for human safety in electromagnetic fields. In order to check compliance between electronic equipment and basic restrictions in human safety standards, additional standards exist that specify more detailed requirements for the testing. Most of these standards are based on measurements, e.g. the European standard EN 50361 for safety of mobile phones. However, there is a growing number of standards that specify requirements for numerical methods, e.g. the European standard EN 50357 for devices used in radiofrequency identification, electronic article surveillance and similar applications. The paper lists today's possibilities and limitations in numerical dosimetric assessment by showing a variety of applications. Since numerical dosimetric assessment that can be used is at a very early stage of development, the examples are not limited to strict compliance testing, but can also be used to get a better insight into physical phenomena such as coupling mechanisms between the electronic device and the user. Special attention is given to the validation of the software and the phantom models of the human body and their influence on the results.
    [BibTeX]
     
    @inproceedings{1514893,
      author = { Manteuffel, D.},
      title = {Numerical dosimetry},
      booktitle = {Antenna Measurements and SAR, 2004. AMS 2004. IEE},
      year = {2004},
      pages = { 59 - 62},
      doi = {10.1049/ic:20040077}
    }


  25. Manteuffel, D. , "A concept to minimize the user interaction of mobile phones", In Antenna Measurements and SAR, 2004. AMS 2004. IEE., may, 2004. , pp. 1 - 4. DOI
    [Abstract]
     
    In this paper, a practical concept to minimize the user interaction of mobile phones is presented. The concept takes into account that the SAR (specific absorption rate) generated in the user's head is mainly due to currents on the PCB of the mobile phone. In order to influence the nearfield generated by these currents in the region of the head, additional metallic strips are attached to the front face of the mobile. The contact points of these strips to the PCB are designed in a way to excite a current distribution on the strips that lowers the nearfield in the region of the head of the user. The investigations are either based on numerical simulations using the FDTD (finite difference time domain) field solver EMPIRE trade; by IMST and experimental investigations using the measurement system DASY (dosimetric assessment system) by Schmid Partner Engineering.
    [BibTeX]
     
    @inproceedings{1514881,
      author = { Manteuffel, D.},
      title = {A concept to minimize the user interaction of mobile phones},
      booktitle = {Antenna Measurements and SAR, 2004. AMS 2004. IEE},
      year = {2004},
      pages = { 1 - 4},
      doi = {10.1049/ic:20040065}
    }


  26. Manteuffel, D. and Kunisch, J. , "Efficient characterization of UWB antennas using the FDTD method", In Antennas and Propagation Society International Symposium, 2004. IEEE., june, 2004. Vol. 2, pp. 1752 - 1755 Vol.2. DOI
    [Abstract]
     
    In this paper, we present a method for the efficient characterization of UWB antennas based on a combination of FDTD simulation and the Lorentz reciprocity principle. In order to obtain a complete spatio-temporal characterization it is sufficient to determine the transmit transfer function by using first a single numerical simulation of the antenna in transmit mode, in only a small nearfield region, followed by a nearfield to farfield transformation. The application of the Lorentz reciprocity theorem then yields the receive transfer function from the transmit transfer function. The transfer functions of the antenna allows the calculation of all quality measures of interest either in the frequency domain or the time domain. The proposed method is validated by a comparison of its results with an EMPIRE trade; FDTD simulation of an entire two antenna system.
    [BibTeX]
     
    @inproceedings{1330536,
      author = {Manteuffel, D. and Kunisch, J.},
      title = {Efficient characterization of UWB antennas using the FDTD method},
      booktitle = {Antennas and Propagation Society International Symposium, 2004. IEEE},
      year = {2004},
      volume = {2},
      pages = { 1752 - 1755 Vol.2},
      doi = {10.1109/APS.2004.1330536}
    }


  27. M. MARTINEZ-VAZQUEZ, D. MANTEUFFEL, O. LITSCHKE: Performance of multiband handset antennas in the presence of a human user. INVITED PAPER in: 2004 URSI International Symposium on Electromagnetic Theory, Pisa (Italy), May 2004.

  28. D. MANTEUFFEL, M. MARTINEZ-VAZQUEZ: Conception d’antennes et simulation électromagnétique à l’IMST. INVITED PAPER in: Réunion du G.T. 4 Antennes et circuits ‘Antennes miniatures multistandards’, Paris, November 2003.

  29. D. MANTEUFFEL, F. GUSTRAU, W. SIMON: Numerical Dosimetric Assessment using the FDTD Method. In: INICA ITG Conference on Antennas, Berlin, 2003

  30. D. MANTEUFFEL, D. HEBERLING, I. WOLFF: EM User Interaction – Consideration for the Design of Mobile Phones. In: INICA ITG Conference on Antennas, Berlin, 2003.

  31. Manteuffel, D. , "Design of multiband antennas for the integration in mobile phones with optimized SAR", In Antennas and Propagation Society International Symposium, 2003. IEEE., june, 2003. Vol. 3, pp. 66 - 69 vol.3. DOI
    [Abstract]
     
    In this paper, the design of a tripleband antenna for the space efficient integration into mobile phones is presented. The antenna is matched to operate at GSM900/GSM1800/GSM1900 standards. In order to minimize the SAR value (specific absorption rate), mainly in the GSM900 frequency range, the current distribution on the casing of the mobile is split by additional metal strips. The investigations are based on numerical simulations using the FDTD (finite difference time domain) field solver EMPIRET trade; by IMST.
    [BibTeX]
     
    @inproceedings{1219790,
      author = {Manteuffel, D.},
      title = {Design of multiband antennas for the integration in mobile phones with optimized SAR},
      booktitle = {Antennas and Propagation Society International Symposium, 2003. IEEE},
      year = {2003},
      volume = {3},
      pages = { 66 - 69 vol.3},
      doi = {10.1109/APS.2003.1219790}
    }


  32. D. MANTEUFFEL, D. HEBERLING: Innovationen in der Antennenentwicklung für Mobiltelefone unter Berücksichtigung des Benutzereinflusses. Eingeladener Beitrag zur: 8. ITG Fachtagung „Mobilfunk – Stand der Technik und Zukunftsperspektiven, pp. 131-136, Osnabrück, 2003.

  33. A. BAHR, F. GUSTRAU, D. MANTEUFFEL, T. M. SCHÜLLER: Occupational Sefety in Electromagnetic Fields of GSM900 Base Station Antennas. In: IEE AMS-2002 – Technical Seminar on Antenna Measurement and SAR, pp. 13/1-13/4, Loughborough UK, 2002.

  34. D. MANTEUFFEL, A. BAHR, CHR. BORNKESSEL, F. GUSTRAU, I. WOLFF: Fundamental aspects for the design of low-SAR mobile phones. In: IEE AMS-2002 – Technical Seminar on Antenna Measurement and SAR, pp. 25/1-25/5, Loughborough UK, 2002.

  35. Manteuffel, D., Bahr, A., Waldow, P. and Wolff, I. , "Numerical analysis of absorption mechanisms for mobile phones with integrated multiband antennas", In Antennas and Propagation Society International Symposium, 2001. IEEE. Vol. 3, pp. 82 -85 vol.3. DOI
    [Abstract]
     
    The absorption mechanism in the human tissue for mobile phones equipped with integrated antennas is analyzed by means of numerical simulations based on the FDTD (finite difference time domain) method. Single-band antennas for 900 MHz and 1800 MHz respectively are situated on realistic models of mobile phones which vary in length. The SAR (specific absorption rate) in a flat-phantom filled with tissue simulating material is observed when the mobiles are situated above. It is shown that there is a strong effect of the PCB (printed circuit board) of the mobile, which acts as the counterpart to the antenna module, on the SAR distribution in the phantom. The investigation shows that especially for 900 MHz the SAR generated by currents on the PCB is dominant in all configurations. Based on the above analysis an integrated multiband antenna for GSM/DCS/PCS is investigated with respect to the SAR distribution in a flat-phantom
    [BibTeX]
     
    @inproceedings{960036,
      author = {Manteuffel, D. and Bahr, A. and Waldow, P. and Wolff, I.},
      title = {Numerical analysis of absorption mechanisms for mobile phones with integrated multiband antennas},
      booktitle = {Antennas and Propagation Society International Symposium, 2001. IEEE},
      year = {2001},
      volume = {3},
      pages = {82 -85 vol.3},
      doi = {10.1109/APS.2001.960036}
    }


  36. Manteuffel, D., Bahr, A., Heberling, D. and Wolff, I. , "Design considerations for integrated mobile phone antennas", In Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480). Vol. 1, pp. 252 -256 vol.1. DOI
    [Abstract]
     
    Based on the investigation of the board effect on the bandwidth of integrated antennas for mobile phones a concept for a tripleband antenna suitable for GSM/DCS/PCS is developed. The antenna concept comprises a parasitic element to enlarge the bandwidth. The performance of the antenna is analyzed by means of numerical simulations based on the FDTD method
    [BibTeX]
     
    @inproceedings{927656,
      author = {Manteuffel, D. and Bahr, A. and Heberling, D. and Wolff, I.},
      title = {Design considerations for integrated mobile phone antennas},
      booktitle = {Antennas and Propagation, 2001. Eleventh International Conference on (IEE Conf. Publ. No. 480)},
      year = {2001},
      volume = {1},
      pages = {252 -256 vol.1},
      doi = {10.1049/cp:20010281}
    }


  37. P. KRALICEK, W. JOHN, D. MANTEUFFEL, F. GUSTRAU, J. BRÜCKNER: Elektromagnetische Abstrahlung von IC und OnChip/OffChip Kopplung. In: 10. E.I.S-Workshop Entwurf integrierter Schaltungen und Systeme, pp. 87-92, Dresden, 2001.

  38. D. MANTEUFFEL, F. GUSTRAU: Charakterisierung des Nahfeldes von Chip/Multichipmodulen mittels Feldsondenmesstechnik. In: 10. E.I.S-Workshop Entwurf integrierter Schaltungen und Systeme, Posterbeitrag, Dresden, 2001

  39. M. GEISSLER, M. MARTINEZ-VAZQUEZ, D. MANTEUFFEL, D. HEBERLING, I. WOLFF: Bandbreitenuntersuchungen an integrierten Handyantennen. In: ITG Diskussionssitzung über Antennen für Mobile Systeme, pp. 73-76, Starnberg, 2000.

  40. D. MANTEUFFEL, A. BAHR, D. HEBERLING, I. WOLFF: Wirkung der Gehäuseabmessungen auf integrierte Antennen in kleinen Mobilfunktelefonen. In: ITG Diskussionssitzung über Antennen für Mobile Systeme, pp. 77-80, Starnberg, 2000.

  41. A. BAHR, D. MANTEUFFEL, D. GERHARDT, K. MENZEL: Occupational safety in the near field of GSM base stations. In: AP2000 – Conference on Antennas and Propagation, Proc. on CDROM, Davos, 2000.

  42. A. BAHR, M. SCHNEIDER, D. MANTEUFFEL, D. HEBERLING: Recent trends for mobile phone antennas with special emphasis to interaction with the user. In: AP2000 – Conference on Antennas and Propagation, Proc. on CDROM, Davos, 2000.

  43. D. MANTEUFFEL, A. BAHR, I. WOLFF: Investigation on integrated antennas for GSM mobile phones. In: AP2000 – Conference on Antennas and Propagation, Proc. on CDROM, Davos 2000
  44. .
  45. D. Manteuffel, Y. Gao, F. Gustrau, I. Wolff: Konzeptionierung eines Feld¬sonden¬messplatzes zum EMV-gerechten Design von Chip/Multichipmodulen. In: ANALOG 99, 5. ITG/GMM Diskussionssitzung Entwicklung von Analogschaltungen mit CAE-Methoden, pp. 455-462, München, 1999.

  46. S. GONZALEZ, L. BAGGEN, D. MANTEUFFEL, D. HEBERLING: Study of coplanar fed antennas using the FDTD method. In: Proc. PIERS, p. 45, Nantes, 1998.

  47. S. GONZALEZ GARCIA, L. BAGGEN, D. MANTEUFFEL, D. HEBERLING: Study of coplanar waveguide-fed antennas using the FDTD method. In: Microwave Opt. Tech. Lett., vol.19, no. 3, pp. 173-176, 1998.

  48. L. BAGGEN, D. MANTEUFFEL, S. GONZALEZ GARCIA, D. HEBERLING: Antennendesign und FDTD-Simulationen: Theorie und Messung. In: ITG Fachtagung Antennen, pp. 123-128, München, 1998.

  49. D. MANTEUFFEL: Entwicklung integrierter Antennen auf keramischer Basis für Mobilfunktelefon. Diplomarbeit im Fachgebiet Allgemeine und Theoretische Elektrotechnik der Gerhard-Mercator-Universität Duisburg, 1998.

  50. D. MANTEUFFEL, H. RÖSMANN: Entwicklung einer Inverted-F-Antenne für Transponderanwendungen mit dem FDTD-Verfahren. In: Seminarunterlagen 1. Öffentliches Statusseminar „Energieautarke Mikrosysteme“ AUTARK, Kamp-Lintfort, 1997.

  51. D. MANTEUFFEL: FDTD Simulationen von Antennenstrukturen für GSM Anwendungen und Ident Systeme. Studienarbeit im Fachgebiet Allgemeine und Theoretische Elektrotechnik der Gerhard-Mercator-Universität Duisburg, 1997.