基于RCS的无源超高频RFID标签识别距离研究*

通过对无源超高频RFID系统中标签功率的获取、传递以及反射的研究，提出了一种基于雷达散射截面(RCS)对标签识别距离进行计算的新方法。采用高频电磁场仿真软件FEKO对不同标签天线进行建模与仿真，计算标签天线在不同负载下的RCS；再结合识别距离表达式计算该标签的最大识别距离，与标签已有的实测参数进行比较，计算结果与实际参数吻合。研究结果证实了该方法对研究标签识别性能具有很好的借鉴意义。

Analysis of identification distance of passive UHF RFID tag based on RCS

Through studying the power collected,transmitted and reflected by the tag in a passive ultra high frequency(UHF) RFID system,this paper presented a new method to calculate the identification distance of the tag based on radar cross section(RCS).By using the high frequency electromagnetic simulation software FEKO on modeling and simulating of the tag antenna to compute the RCS of the tag antenna with different loads,and combining with the expression of identification distance, found the maximum identification distance. Then compared to measured parameters, the results coincided with the actual parameters. It has provided good reference to the identification performance of the tag.