本文在介绍射频电路设计理论的基础上，对UHF RFID的协议及频谱规范进行深入研究整理，系统的论述了射频前端从方案提出、电路实现到性能测试的整个过程，并创新性地研究了射频前端中的许多关键技术。-This paper describes the theory of RF circuit design basis, and the spectrum UHF RFID of Xie Yi Shen Ru norms of order, the system of paper Le RF front-e

维格纳-威尔分布三维图面图，跳频信号的stft，跳频信号的维格纳-威尔分布的频谱图-Wigner- Will the distribution of three-dimensional surface maps, frequency hopping signal stft, frequency hopping signal Wigner- Will the distribution of spectrum