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http://dx.doi.org/10.5370/KIEE.2011.60.2.370

RFID Antenna Module with High Isolation Characteristic between Tx and Rx  

Park, Dong-Hoon (서울시립대 전자전기컴퓨터공학부)
Kim, Gui-Sung (서울시립대 전자전기컴퓨터공학부)
Kim, Hyung-Eun (서울시립대 전자전기컴퓨터공학부)
Park, Hye-Mi (서울시립대 전자전기컴퓨터공학부)
Wei, Kai (서울시립대 전자전기컴퓨터공학부)
Lim, Eun-Cheon (서울시립대 전자전기컴퓨터공학부)
Lee, Moon-Que (서울시립대학교 전자전기컴퓨터공학부)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.60, no.2, 2011 , pp. 370-375 More about this Journal
Abstract
In this paper, we propose an antenna module with high isolation between Tx and Rx in RFID reader module. The proposed module consists of a quadrafilar antenna and a directional coupler with a switchable dummy load to improve the directivity. The proposed module achieves the isolation higher than 20 dB between Tx and Rx. To show the validity of the proposed scheme, we have performed the measurement of tagging range and multi-tagging ability. The experiment results show that the detecting range and multi-tagging ability are enhanced by 81% and 200%, respectively.
Keywords
RFID; RFID Front-End; Tx-Rx isolation; Directional coupler; Tx leakage; Tagging range; Multi tagging;
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