Novel small-size directional antenna for UWB WBAN/WPAN applications

M Klemm, Istvan Z Kovacs, Gert F Pedersen, Gerhard Troster

Research output: Contribution to journalArticle (Academic Journal)peer-review

182 Citations (Scopus)
893 Downloads (Pure)


This paper presents a novel small-size directional antenna design for ultrawide-band wireless body area networks/wireless personal area networks applications. The design is based on a typical slot antenna structure with an added reflector in order to achieve directionality. The effects of different antenna parameters and human body proximity on the radiation characteristics are analyzed. Antenna measurements with an optic RF setup were performed in order to characterize the small-size antenna far field radiation pattern. The different structural antenna parameters were optimized via extensive numerical simulations. Results show that for frequencies above 3.5 GHz, where the power front-to-back ratio of the directional antenna is greater than 10 dB, its impedance is nearly the same as in the free space. It is not the case neither for the omnidirectional slot antenna nor the monopole antenna next to the body. Between 3 and 6 GHz performance of the novel directional antenna, in terms of radiation efficiency and SAR values, is significantly improved compared to omnidirectional antenna designs.
Translated title of the contributionNovel small-size directional antenna for UWB WBAN/WPAN applications
Original languageEnglish
Pages (from-to)3884 - 3896
Number of pages13
JournalIEEE Transactions on Antennas and Propagation
Issue number12
Publication statusPublished - Dec 2005

Bibliographical note

Publisher: IEEE
Rose publication type: Journal article

Terms of use: Copyright © 2005 IEEE. Reprinted from IEEE Transactions on Antennas and Propagation.

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