Implementation of Low-Cost UHF RFID Reader Front-Ends with Carrier Leakage Suppression Circuit

摘要

A new ultrahigh frequency radio frequency identification (UHF RFID) reader's front-end circuit which is based on zero-IF, single antenna structure and composed of discrete components has been designed. The proposed design brings a significant improvement of the reading performance by adopting a carrier leakage suppression (CLS) circuit instead of a circulator which is utilized by most of the conventional RF front-end circuit Experimental results show that the proposed design improves both the sensitivity and detection range compared to the conventional designs.