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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Hybrid Reader Antenna for Near- and Far-Field RFID in UHF Band

근거리장 및 원거리장용 하이브리드 RFID 리더 안테나

  • Lee, Chu-Yong (School of Electronic and Electrical Engineering, Hongik University) ;
  • Han, Wone-Keun (Department of Physics, Hongik University) ;
  • Park, Ik-Mo (School of Electrical and Computer Engineering, Ajou University) ;
  • Choo, Ho-Sung (School of Electronic and Electrical Engineering, Hongik University)
  • 이주용 (홍익대학교 전자전기공학부) ;
  • 한원근 (홍익대학교 물리학과) ;
  • 박익모 (아주대학교 전자공학부) ;
  • 추호성 (홍익대학교 전자전기공학부)
  • Published : 2009.02.28
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Abstract

In this paper, we propose a novel hybrid reader antenna using a triangular and rectangular sub-patch for near- and far-field RFID reader in UHF band. The antenna operates at 912 MHz, and the low-cost mass-production is available, since the antenna can be built by printing on a FR-4 substrate. The triangular patch is designed to produce a circularly polarized radiation along the bore-sight direction and the rectangular sub-patch is designed to generate a strong magnetic field over the antenna aperture. The measurement shows Hz field greater than -25 dBA/m(3 cm above the antenna aperture), and exhibits circularly polarized radiation(AR<3 dB) with a radiation gain of 6 dBi.

본 논문에서는 삼각형 패치와 서브 패치를 이용하여 국내 UHF RFID 대역에서 근거리장 영역과 원거리장 영역을 겸용하여 사용할 수 있는 안테나를 제안하였다. 제안된 안테나는 FR-4 기판에 마이크로스트립 패치로 인쇄되어 대량생산이 용이한 평면 구조이며, UHF RFID 주파수 대역(912 MHz)에서 동작하도록 설계하였다. 삼각형 패치를 이용하여 정면방향에서 원형편파 특성을 가지고 동작하며 서브 패치를 삽입하여 근거리장 영역에서 강하고 균일한 수직 자계를 형성 할 수 있도록 하였다. 측정 결과 제작된 안테나는 개구면에서 3 cm 떨어진 근거리장 영역에서 -25 dBA/m 이상의 수직 자계를 형성하며, 정면방향 원거리장에서 AR<3 dB의 원형편파를 복사하며 6 dBi의 복사 이득을 보였다.

Keywords

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