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A dual frequency antenna for RSSI-based DOA estimation - from theory to prototype

: Hartmann, M.; Wohler, M.; Schühler, M.; Weisgerber, L.; Thielecke, J.; Heuberger, A.


Motygin, O.V. ; Institute of Electrical and Electronics Engineers -IEEE-:
International Conference Days of Diffraction 2016. Proceedings : June 27-July 1, 2016, St. Petersburg, Russia
Piscataway, NJ: IEEE, 2016
ISBN: 978-1-5090-5800-6
ISBN: 978-1-5090-5801-3
International Conference "Days of Diffraction" (DD) <2016, St. Petersburg>
Conference Paper
Fraunhofer IIS ()

Wildlife monitoring, e.g. tracking bats, is one of many emerging applications applying wireless sensor networks. In this paper, a dual band antenna for field strength-based direction finding is presented. The complete design process including theoretical considerations and simulations towards a working prototype is shown. To meet the networks crucial requirements of robustness and low-cost fabrication, the design of the antenna pursues a passive approach to realize a set of two orthogonal radiation patterns without side-lobes. The antenna is influenced by the small element separation, i.e. additional side-lobes and impedance transformation. The effects are compensated by an optimized element arrangement, as well as a dual-band matching and decoupling of the antenna elements. The proposed directional antenna array provides a gain pattern suitable for precise field strength-based direction of arrival estimation.