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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/C781E308-0411-4C6B-BF9E-0DD82222C45B | ||
| Year | 2011 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | 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 | ||
| Appears in Collections |
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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