Title: Implementation of Tx/Rx isolation in an RFID reader

Authors: Katariina Penttila, Lauri Sydanheimo, Markku Kivikoski

Addresses: Rauma Research Unit, Institute of Electronics, Tampere University of Technology, Kalliokatu 2, Rauma FIN-26100, Finland. ' Rauma Research Unit, Institute of Electronics, Tampere University of Technology, Kalliokatu 2, Rauma FIN-26100, Finland. ' Rauma Research Unit, Institute of Electronics, Tampere University of Technology, Kalliokatu 2, Rauma FIN-26100, Finland

Abstract: This paper analyses three Tx/Rx isolation methods for an RFID reader: use of separate transmission and receiving antennas, use of a circulator and use of a directional coupler. With portable readers, directional couplers offer the most suitable performance owing to their small size, low cost and most often sufficient performance.

Keywords: passive backscattering; circulators; directional couplers; low costs; passive tags; radio frequency identification; RFID; separate antennas; transmission antennas; receiving antennas; Tx/Rx isolation; portable readers.

DOI: 10.1504/IJRFITA.2006.010708

International Journal of Radio Frequency Identification Technology and Applications, 2006 Vol.1 No.1, pp.74 - 89

Published online: 19 Aug 2006 *

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