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Room-coverage improvements in UHF RFID with commodity hardware

Bletsas Aggelos, Sahalos, J.N., Dimitriou Antonis G.

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URI: http://purl.tuc.gr/dl/dias/C781E308-0411-4C6B-BF9E-0DD82222C45B
Έτος 2011
Τύπος Δημοσίευση σε Περιοδικό με Κριτές
Άδεια Χρήσης
Λεπτομέρειες
Βιβλιογραφική Αναφορά A.G. Dimitriou, A. Bletsas and J.N. Sahalos, "Room Coverage Improvements in UHF RFID with Commodity Hardware", IEEE Antennas & Propagation Magazine, vol. 53, no. 1, Feb. 2011. DOI: 10.1109/MAP.2011.5773609 https://doi.org/10.1109/MAP.2011.5773609
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Περίληψη

This work studies the three-dimensional (3D) identification performance of UHF RFID systems with commodity hardware. Detailed three-dimensional propagation modeling is developed, with ray-tracing that allows examination of tag- as well as reader-antenna diversity. It is shown that multipath can enhance identification performance compared to free-space conditions. Furthermore, it is found that tag diversity can enhance identification performance on the order of 10%. Reader-antenna diversity becomes beneficial only when special attention is given to controlling the destructive summation of the transmitted fields and simple, general antenna-installation rules are provided. Performance can be further enhanced with the introduction of a phase shifter or appropriate transmission scheduling, and various examples are discussed. Measurements inside a room with a dense three-dimensional grid of passive RFID tags confirmed the results. Finally, a method to perform power-measurements with commodity RFID hardware that exploits the sensitivity-during-read threshold of each tag is put forth.

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