Design of Miniaturized Multi-Protocol UHF RFID Reader Module

An UHF RFID reader module is designed in this paper, which supports the international standard ISO/IEC 18000-6C and the Chinese standard GB/T 29768-2013. High isolation is achieved by a directional coupler based double-tuning RF transmit-receive circuit with a compact structure, which alleviates the linearity requirements of the receiver front-end. The designed reader module working in 920~925 MHz band with a saturate output power of 29.6 dBm, and the inventory range is larger than 15 m for both the international and the Chinese standard tags. The miniaturization of the reader module is realized by using the compact transmit-receive isolation circuit and sandwich-stack packaging of the printed circuit boards, and the volume is only 70×60×15 mm
³
.