一种新型UHF RFID读写模块的研制

Development of a novel UHF RFID module

传统的超高频RFID读写模块一般都会对天线驻波比较敏感,当天线回波过大时将导致发射机输出功率泄漏到接收机中能量较多而引起阻塞现象,进而使读写器性能恶化。在此描述了一种新型超高频读写模块的电路设计,通过在天线与耦合器之间嵌入一种闭环可调谐匹配网络,有效解决了天线驻波失配情况下导致接收机性能蜕化的现象。实验结果证明采用这种新型模块的读写器无论从读写距离还是多标签处理性能上都获得了较大提升,达到了预期的效果。

Traditional UHF RFID read-write modules are usually sensitive to VSWR of antenna. When reflection wave is large, the receiver is blocked as a result of leakage of transmitter output power and the performance of RFID read-write module is deteriorated. In this paper, the design of a novel UHF RFID read-write module is described. By inserting a closed-loop adjust- able match network between antenna and coupler, the problem of receiver performance degeneration caused by antenna VSWR mismatching can be solved. Experiment result show that read-write range and multi-tag processing ability of this module can be improved greatly and desired result can be achieved.