The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Impedance Evaluation Method of UHF RFID Tag Chip for Maximum Read Range

UHF RFID 태그의 최대 인식 거리를 얻기 위한 태그 칩의 임피던스 산출 방법

  • Sim, Yong-Seog (Graduate School of Information & Communication, Daegu University) ;
  • Yang, Jeen-Mo (School of Electronic & Electrical Engineering, Daegu University)
  • 심용석 (대구대학교 정보통신공학과) ;
  • 양진모 (대구대학교 전자전기공학부)
  • Received : 2013.10.10
  • Accepted : 2013.11.26
  • Published : 2013.12.31
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Abstract

In a passive UHF RFID system, the impedance matching between tag antenna and chip as well as the protocol parameter settings in a reader plays important role in determination of the maximum read-range. Almost no paper, however, has dealt with the above issues in relation with the maximum read range. In this paper, two known methods (of using the value from data sheets and proprietary RFID tester) and our proposing method in chip impedance evaluation are compared in terms of maximum read range. The read range of tags whose antenna impedance is conjugate matched with the chip impedance obtained from the proposed method is improved maximum 73 % more than that of tags from the other methods.

수동형 UHF RFID 시스템에서 태그의 최대 인식 거리는 태그 칩과 안테나 사이의 임피던스 정합과 리더의 프로토콜 파라미터 설정에 따라 직접적인 영향을 받는다. 하지만 칩 임피던스 산출 방법과 프로토콜 파라미터가 최대 인식 거리에 미치는 영향에 대한 연구는 전무한 실정이다. 따라서 본 논문에서는 기존 방법(데이터 시트와 전용 RFID 테스터를 이용)과 제안된 방법(상용 리더를 이용)으로 칩의 임피던스를 산출한 후 이 값으로 태그를 제작해 인식 거리를 비교함으로써, 인식 거리를 극대화하는 칩 임피던스 산출 방법에 대한 비교분석을 하였다. 제안된 방법으로 산출된 임피던스에 공액 정합된 태그가 상용리더를 이용한 인식 거리 측정 실험에서 기존 방법과 비교하여 최대 73 % 인식 거리의 개선을 보였다.

Keywords

References

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