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International Journal of Antennas and Propagation
Volume 2013, Article ID 135203, 8 pages
Research Article

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

1The Key Laboratory of RF Circuits and System of Ministry of Education, Hangzhou Dianzi University, Hangzhou 310018, China
2Nokia Siemens Networks Technology (Beijing) Co., Ltd., Hangzhou 310053, China
3Shanghai TYD Electronic Technology Co., Ltd., Shanghai 200233, China

Received 29 August 2013; Accepted 9 October 2013

Academic Editor: Bing Liu

Copyright © 2013 Bin You et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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.