전기학회논문지 (The Transactions of The Korean Institute of Electrical Engineers)

  • 제60권2호
  • /
  • Pages.370-375
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  • 2011
  • /
  • 1975-8359(pISSN)
  • /
  • 2287-4364(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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송.수신 격리 특성을 개선한 RFID 안테나 모듈

RFID Antenna Module with High Isolation Characteristic between Tx and Rx

  • 박동훈 (서울시립대 전자전기컴퓨터공학부) ;
  • 김귀성 (서울시립대 전자전기컴퓨터공학부) ;
  • 김형은 (서울시립대 전자전기컴퓨터공학부) ;
  • 박혜미 (서울시립대 전자전기컴퓨터공학부) ;
  • 위개 (서울시립대 전자전기컴퓨터공학부) ;
  • 임은천 (서울시립대 전자전기컴퓨터공학부) ;
  • 이문규 (서울시립대학교 전자전기컴퓨터공학부)
  • 투고 : 2010.09.13
  • 심사 : 2010.12.17
  • 발행 : 2011.02.01
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초록

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.

키워드

참고문헌

  1. Daniel M. Dobkin, The RF in RFID : passive UHF RFID in practice, Newnesl, 2007.
  2. K. Penttil, L. Sydnheimo, and M. Kivikoski, "Implementation of Tx/Rx isolation in an RFID reader," Int. J. Radio Freq. Identification Technol. Appl, Vol. 1, No. 1, pp.74-79, 2006. https://doi.org/10.1504/IJRFITA.2006.010708
  3. Won-Gyu Lim, Seo-Young Park, Wang-Ik Son, Moon-Que Lee, and Jong-Won Yu, "RFID Reader Front-End Having Robust Tx Leakage Canceller for Load Variation," IEEE Trans. Microwave theory and Techniques, Vol. 57, No. 5, pp.1348-1355, May 2009. https://doi.org/10.1109/TMTT.2009.2017308
  4. Won-Gyu Lim, and Jong-Won Yu, "Balanced Circulator Structure with Enhanced Isolation Characteristics," Microwave and Optical Technology Letters, Vol. 50, No. 9, pp.2389-2391, September 2008. https://doi.org/10.1002/mop.23696
  5. Hyeong-Seok Jang, Won-Gyu Lim, and Jong-Won Yu, "UHF RFID Reader Front-end Having Wideband and Stable Tx/Rx Isolation Characteristic," Microwave and Optical Technology Letters, Vol. 52, No. 11, pp.2467-2473, November 2010. https://doi.org/10.1002/mop.25501
  6. Behazad Razavi, RF Microelectronics, Prentice-Hall, 1998.
  7. Moon-Que Lee,"Lumped directional coupler with a varactor tuned reflector for RFID applications," IEICE Electronics Express, Vol.6, No.2, pp.129-134, January 2009. https://doi.org/10.1587/elex.6.129
  8. David M. Pozar, Microwave Engineering, Jhon Wiley and Sons. Inc 3rd Edition, 2005.
  9. 나원, 이문규, "UHF 대역 RFID를 위한 우수한 신호분리 특성을 가진, 송수신 분리 방향성 결합기", 제2회 RFID/USN 연구논문 공모 수상작, pp.1-5, 2006.