Wireless Communications

Pub2

    2012

    1. Manteuffel, D. and Grimm, M. , "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 = {Manteuffel, D. and Grimm, M.},
        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. Martens, R. and Manteuffel, D. , "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 = {Martens, R. and Manteuffel, D.},
        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. Safin, E., Martens, R. and Manteuffel, D. , "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 = {Safin, E. and Martens, R. and Manteuffel, D.},
        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. Grimm, M. and Manteuffel, D. , "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 = {Grimm, M. and Manteuffel, D.},
        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}
      }

    2011

    1. Manteuffel, D. and Martens, R. , "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 = {Manteuffel, D. and Martens, R.},
        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. Manteuffel, D., Hoeher, P. and Mehdorn, M. , "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.
      [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 = {Manteuffel, D. and Hoeher, P.A. and Mehdorn, M.},
        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. Martens, R., Safin, E. and Manteuffel, D. , "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.
      [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 = {Martens, R. and Safin, E. and Manteuffel, D.},
        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. Grimm, M. and Manteuffel, D. , "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 = {Grimm, M. and Manteuffel, D.},
        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. Martens, R., Safin, E. and Manteuffel, D. , "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 = {Martens, R. and Safin, E. and Manteuffel, D.},
        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. Luxey, C. and Manteuffel, D. , "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 = {Luxey, C. and Manteuffel, D.},
        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. Martens, R. and Manteuffel, D. , "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.
      [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 = {Martens, R. and Manteuffel, D.},
        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. Grimm, M. and Manteuffel, D. , "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 = {Grimm, M. and Manteuffel, D.},
        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. Martens, R., Safin, E. and Manteuffel, D. , "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 = {Martens, R. and Safin, E. and Manteuffel, D.},
        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. Manteuffel, D., Grimm, M. and Martens, R. , "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 = {Manteuffel, D. and Grimm, M. and Martens, R.},
        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. Manteuffel, D., Ould, T. and Kempka, T. , "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 = {Manteuffel, D. and Ould, T. and Kempka, T.},
        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. Manteuffel, D., Arnold, M., Makris, Y. and Chen, Z.-N. , "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 = {Manteuffel, D. and Arnold, M. and Makris, Y. 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. Manteuffel, D. and Arnold, M. , "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.
      [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 = {Manteuffel, D. and Arnold, M.},
        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. Manteuffel, D. , "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 = {Manteuffel, D.},
        title = {MIMO antenna design challenges},
        booktitle = {Antennas Propagation Conference, 2009. LAPC 2009. Loughborough},
        year = {2009},
        pages = {50 -56},
        doi = {10.1109/LAPC.2009.5352587}
      }

    2008

    1. Manteuffel, D. and Arnold, M. , "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 = {Manteuffel, D. and Arnold, M.},
        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}
      }

    2. Arnold, M. and Manteuffel, D. , "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 = {Arnold, M. and Manteuffel, D.},
        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}
      }

    2007

    1. 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}
      }

    2. 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}
      }

    3. 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}
      }

    4. 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}
      }

    5. 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.
      [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}
      }

    6. 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.
      [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}
      }

    7. 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., Bucci, O., Wiesbeck, W., Mazanek, M., Sipus, Z., Hall, P. and Ibars, C. , "The European School of Antennas: Results and perspectives", In Applied Electromagnetics and Communications, 2007. ICECom 2007. 19th International Conference on., sept., 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{4544426,
        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 Bucci, 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 = {Applied Electromagnetics and Communications, 2007. ICECom 2007. 19th International Conference on},
        year = {2007},
        pages = {1 -6},
        doi = {10.1109/ICECOM.2007.4544426}
      }

    2006

    1. 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}
      }

    2. 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.
      [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}
      }

    2005

    1. 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}
      }

    2004

    1. 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}
      }

    2. 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}
      }

    3. 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}
      }

    2003

    1. 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}
      }

    2001

    1. 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}
      }

    2. 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}
      }

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