Radio frequency identification (RFID) tags produce electromagnetic (EM) coupling when stacked together, causing performance degradation of RFID systems. This problem is different from the well-known RFID collision problem. This paper first obtains the connection between the tag’s reading power and antenna gain of both forward link and reverse link by theoretical derivation. The tag antenna gain is simulated when two tags are close to each other. By comparing with the reading power of two tags measured in the experiment, the following conclusions are made. Performance of RFID systems is limited by the forward link when tags are stacked. Antenna gain and power transmission coefficient of stacked tags are key factors that influence tags reading rate. Conclusions can provide a reference for developing high performance tags in dense tag environment.
XIAO Fang-xin, ZHANG Xue-fan, LI Shuai, PENG Zhang-you, ZHAI Xu-ping, REN Xiu-fang, MENG Chun-yang
. RFID Limited System Link Analysis of Stacked Tags[J]. Journal of Shanghai University, 2014
, 20(5)
: 624
-632
.
DOI: 10.3969/j.issn.1007-2861.2013.07.048
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