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Compact diversity antenna for UHF RFID readers

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4 Author(s)
Ouattara, Y.B. ; Lab. ESYCOM, Univ. Paris-Est Marne-la-Vallee, Marne-la-vallée, France ; Hamouda, C. ; Poussot, B. ; Laheurte, J.M.

A diversity antenna combining four inverted-F antennas (IFAs) is evaluated for UHF RF identification (RFID) readers. Polarisation and pattern diversities are obtained for a sequentially rotated configuration of the IFAs. Mutual coupling between ports is minimised by etching quarter-wavelength slots into the ground plane. The resulting envelope correlation coefficient is less than 0.003 in the working band. A switching diversity scheme is then applied to evaluate the tags readability in a lab environment. It is shown that the antenna diversity enhances the reading range compared to a circularly or a linearly polarised antenna of the same size.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 16 )

Date of Publication:

August 2 2012

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