物联网中UHF频段RFID读写器设计

基于物联网中数据采集的需要，设计了一个UHF频段便携式RFID读写器。介绍了读写器的工作原理，重点阐述了射频前端电路的设计。用专用芯片AS3992及其外围电路完戍射频信号的收发，用STM32系列单片机完成基带信号处理和控制。还简单介绍了系统的软件工作流程以及低功耗设计的细节。测试结果表明：该读写器支持ISO／IEC18000—6B／6C协议，具备小型化、远距离、低功耗、易扩展等特点，能满足智能物联网的实际需要。

Design of UHF RFID reader in IOT

A portable UHF RFID （radio frequency identification） reader is designed to meet the needs of data acquisition in lOT （internet of things）.The working principle of the system is given,the RF front-end circuit is taken as the focal point,the RF signals are transceived by special chip AS3992 and its peripheral circuit,the process and control of baseband signal are completed by MCU STM32 series.It is also briefly introduced that the software flow of system and details for low power design. Practice shows the RFID reader implemented in this paper has achieved high-speed identification of ISO/IEC 18000-6B/6C RFID tags.It is so small, long-distance, low-power, easy to expand and so on,which can meet the practical needs of intelligent IOT.