一种RFID读写器载波泄露消除的技术-《集美大学学报（自然科学版）》

文章信息/Info

Author(s):: ZHAO Jingyu; CAO Yang; MA Zhonghua; (School of Information Engineering,Jimei University,Xiamen 361021,China)

Keywords:: circulator; carrier leakage; radio frequency identification; phase shift; carrier suppression ratio

摘要:: 为了消除接收回路的泄露载波，提出采用接收机输入端泄露载波对消的方法。在读写器电路中加入衰减器和移相器电路，由接收信号强度检测电路控制单片机来调整相应衰减量和相移量以消除在接收机输入端泄露的载波。在工作频带内，仿真的泄露载波抑制度达到了91 dB，提高了读写器接收灵敏度，增加了读写距离。

Abstract:: In order to suppress the influence of the leaking carrier,a leaking carrier cancellation method using in the input of the receiver is proposed in this paper.The attenuator and the phase shifter circuits are added to the reader circuit,which can be adjusted to cancel the leaking carrier at the input port of the receiver by the received signal strength detection circuit controls the microcontroller unit （MCU).The simulated leaking carrier of the receiver can be suppressed by 91 dB in the operating frequency band.After the leaking carrier cancellation,the sensitivity of the RFID system is improved and the reading distance is increased.