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

被引:9
|
作者
Zhang, Qi [1 ]
Crisp, Michael. J. [1 ]
Penty, Richard V. [1 ]
White, Ian H. [1 ]
机构
[1] Univ Cambridge, Elect Engn Div, Cambridge CB3 0FA, England
基金
英国工程与自然科学研究理事会;
关键词
Circularly polarized tag; close proximity; passive ultra high frequency (UHF); polarization diversity; radio frequency identification (RFID); tag pairs;
D O I
10.1109/TAP.2015.2403875
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A new technique that enables passive ultra high frequency (UHF) radio frequency identification (RFID) tags to be read when they are placed in close proximity in an array is presented. This paper demonstrates that, in a linear tag array with a tag separation of 1 cm, the interaction between the backscattered waves and incident wave causes a significant degradation in tag sensitivity. It is found that the use of tags that have polarization diversity can improve the read performance when they are placed in close proximity to one another compared with conventional linear tags. Two ways of achieving polarization diversity are studied in this paper, namely: 1) using a circularly polarized tag and 2) 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 2.6-dB increase in read power margin for a 57-tag array with 1 cm separation compared with using conventional linearly polarized tags.
引用
收藏
页码:2264 / 2271
页数:8
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