多径传播环境下的无源UHF RFID系统电波传播模型

摘要

针对自由空间模型在预测射频识别系统识别距离时存在的偏差，综合考虑射频识别系统应用的多径传播环境，建立一种无源超高频射频识别系统电波传播模型，并重点分析了前向链路路径损耗的主要影响因素及其计算方法。基于该电波传播模型，探索性地提出实际环境下的无源超高频射频识别应用模拟思路。仿真和测量结果表明，该模型在预测无源超高频射频识别系统识别距离时更为准确。%There is a deviation in predicting identification distance of the radio frequency identification system for free-space model, a radio propagation model for passive UHF RFID systems is proposed by taking into full consideration to the application of RFID system in multipath propagation environment. Main affecting factors and its calculation methods of path loss are analyzed emphatically for the forward link of passive UHF RFID systems. Furthermore, a simulated method of passive UHF RFID applications in the actual environment is presented based on the proposed propagation model. The simulated and measured results show that the identification distance of passive UHF RFID is predicted more accurately by using the proposed model.