摘要
密集布放标签时,UHF RFID标签之间存在耦合,导致系统性能的下降。标签接收到的阅读器发射功率小于耦合标签的激活功率,或者阅读器接收不到标签的反射信号,阅读器和标签之间不能正常通信。本文首先从理论上推导出了标签耦合时前后向链路的性能,并仿真了标签耦合时的增益以及散射面积等因素,然后用前后向链路最大读取距离比值法分析判断出了RFID的受限链路,最后用天线探针的实验方法证明了结论。该结论对阅读器天线的选取、正确摆放标签的位置以及提高RFID系统的读取性能有着重要意义。
When laying intensive tags,there is a coupling between the UHF RFID tags.It causes the system performance degradation.If the power one tag received from reader is less than the activation power of coupling tags,or the reader can＇t receive the reflected signal of coupling tags,then the reader can＇t be normal communication with the coupling tags.Firstly,in this paper,the performance of the forward link and the reverse link theoretically derived from the coupling tags.And this paper also simulated the gain and scattering area when many tags are put together.Then the ratio of the maximum reading distance of forward and reverse link analysis and figures out RFID restricted link.Finally,the experiment of antenna probe proves this thesis conclusion.The conclusion for the reader antenna selection,proper placement position of tags and improve RFID tag read performance system is of great significance.
出处
《电子测量技术》
2016年第1期9-13,共5页
Electronic Measurement Technology
基金
上海市科学技术委员会重点支撑项目(12510500600)
关键词
RFID
链路
密集布放
射频识别
耦合
RFID
link
intensive laying
radio frequency identification
coupling
