无源射频识别系统中的雷达截面分析与计算

基于无源射频识别技术原理和天线散射理论，导出了不同负载情况下的雷达截面计算方法，并结合雷达截面和电磁传播环境分析了无源射频识别系统的识别距离.通过测量标签天线不同负载情况下的反向散射功率，再结合该计算方法，从而得出雷达截面.理论分析与实验测量结果保持一致.研究结果对优化无源射频识别系统的标签性能有益. 关键词： 射频识别 天线 雷达截面 识别距离

Analysis and calculation of radar cross section in passive RFID systems

Based on the theory of passive RFID technology and antenna scattering, some computation methods for radar cross-section of tag antennas with different loads are derived, and by integrating the radar cross-section with electromagnetic propagation environment, the identification range of passive radio frequency identification is theoretically analyzed. Furthermore, by measuring backscattered power in the case of different loads, and then combined with the calculating methods, radar cross-section of the tag is also found. Theoretical analysis results are found to be in good agreement with experimental data. The results obtained are useful for optimizing tag performance in passive RFID systems.