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Improving backscatter radio tag efficiency

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

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Year 2010
Type of Item Peer-Reviewed Journal Publication
Bibliographic Citation A. Bletsas, A.G. Dimitriou and J.N. Sahalos, "Improving Backscatter Radio Tag Efficiency", IEEE Transactions on Microwave Theory and Techniques (TMTT), vol. 58, no. 6, pp. 1502-1509, Jun. 2010. DOI: 10.1109/TMTT.2010.2047916
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This paper studies tag properties for optimized tag-to-reader backscatter communication. The latter is exploited in RF identification (RFID) systems and utilizes binary reflection coefficient change of the tag antenna-load circuit. It is shown that amplitude maximization of complex reflection coefficient difference between the two states is not sufficient for optimized tag-to-reader backscatter communication, contrary to what is commonly believed in the field. We provide a general tag load selection methodology that applies to any tag antenna, including minimum scattering antennas as a special case. The method is based on tag antenna structural mode closed-form calculation (given three values of tag radar cross section), employs simple antenna/communication theory, and applies to both passive, as well as semipassive RFID tags.