Reduction of Proximity Effects on UHF Passive RFID Systems by Using Tags With Polarization Diversity


A brand new technique that permits passive ultra high frequency (UHF) radio frequency identification (RFID) tags to be read once they are placed in close proximity in an array is presented. This paper demonstrates that, during a linear tag array with a tag separation of 1 cm, the interaction between the backscattered waves and incident wave causes a vital degradation in tag sensitivity. It is found that the utilization of tags that have polarization diversity will improve the scan performance after they are placed in close proximity to at least one another compared with typical linear tags. 2 ways of achieving polarization diversity are studied during this paper, namely: one) employing a circularly polarized tag and a pair of) using a cross-polarized tag pair. Both methods show an improvement in close proximity read performance and it is experimentally demonstrated that by using cross-polarized tag pairs in an array, one achieves on average a a pair of.half-dozen-dB increase in scan power margin for a 57-tag array with 1 cm separation compared with using conventional linearly polarized tags.

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