Considerations for the Design of UWB Antennas for Mobile and Consumer Equipment

Dirk Manteuffel

Abstract


This paper presents some considerations on the design, characterization and optimization of UWB (Ultra WideBand) antennas for consumer communication equipment. As a first step a method to extract the spatio-temporal UWB antenna characterization from a FDTD simulation is given. Thereafter, the shape of a planar monopole is optimized to provide broadband matching. This is followed by the integration of latter antenna into a model of a DVD player and the impact of this integration on the antenna performance is evaluated. Finally, the transfer function of the complete system is extracted and used for indoor propagation modeling in an exemplary living home environment. The results show that the antenna integration into the DVD-chassis results into a directive radiation pattern that shows a significant frequency dependency. When this antenna is used for the propagation modeling, a single frequency ray-tracing simulation shows significant variation in the radiated power distribution in the room as a result of the directive pattern. When the received power is averaged over a larger bandwidth, the coverage becomes more smooth mainly due to the frequency dependency of the radiation pattern and frequency dependent propagation effects. Indeed, comparing the results of the integrated antenna to the case of the ideal isotropic radiator, no major disadvantages can be discerned anymore.

Keywords


UWB, antennas, FDTD, transfer function, consumer equipment, propagation modeling.

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References


Federal Communications Commission (FCC): Revision of Part 15 of the communication’s rules regarding ultra wideband transmission systems. First report and order, ET Docket 98-153, FCC 02-48; Adopted: Feb. 14th, 2002; Released: Apr. 22nd, 2002.

D. Manteuffel, J. Kunisch: Efficient characterization of UWB antennas using the FDTD method. AP-S – International Symposium on Antennas and Propagation, Monterey (CA) USA, June 2004.

J. Kunisch, J. Pamp: UWB radio channel modeling considerations. In: Proc. Of ICEAA’03, Turin, Sep. 2003.

IMST GMBH: User and Reference Manual for the 3D EM Time Domain Simulator Empire. http://www.empire.de/empire.pdf, November 2003.

J. P. BERENGER: A perfectly matched layer for the absorption of electromagnetic waves. In: J. Comp. Phys., vol. 114, pp. 185-200, 1994. https://doi.org/10.1006/jcph.1994.1159

W. Sörgel, Ch. Waldschmidt, W. Wiesbeck: Transient response of Vivaldi antenna and logarithmic periodical dipole array for ultra wideband communication. In: AP-S – International Symposium on Antennas and Propagation, Proc. on CDROM, Columbus (Ohio) USA, 2003.

M. Cabedo-Fabrés, M. Ferrando-Bataller, A. Valero-Nogueira: Innovative wide-band planar monopole antennas for multi-service mobile systems. AP-S – International Symposium on Antennas and Propagation, Columbus (OH) USA, July 2003.

J. Romme, B. Kull: On the relation between bandwidth and robustness of indoor UWB communication. In: UWBST Conference, Reston, Nov. 2003.




DOI: http://dx.doi.org/10.5130/ajict.v1i1.25