Journal of the Korea Convergence Society (한국융합학회논문지)

Korea Convergence Society (한국융합학회)
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A Design of a circularly polarized small UHF RFID antenna

소형 원형편파 UHF RFID 대역 융합형 안테나 설계

  • Chae, Gyoo-Soo (Division of Information & Communication Eng., Baekseok University)
  • Received : 2014.12.04
  • Accepted : 2015.02.20
  • Published : 2015.02.28
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Abstract

A circularly polarized small UHF RFID reader antenna is presented. The antenna is composed of four elements and printed on the plastic substrate(${\varepsilon}_r=2.2$, t=5mm). Each element is fed by a probe which is sequentially connected to the feed line. The feed line is manufactured on the FR-4 substrate(t=1.0mm, ${\varepsilon}_r=4.7$). The simulation results shows that the antenna can be achieved a return loss of 12dB, gain of 3.46dBic over the UHF band of 902-928MHz. According to our simulation results, two prototype antennas are manufactured and measured. The obtained antennas operate in UHF RFID bands and can be adapted for various portable applications. In addition, a parametric study is conducted to facilitate the design and optimization processes.

본 논문에서는 UHF 대역의 RFID 리더기에 적용 가능한 소형 융합형 원형편파 안테나가 제시되었다. 안테나는 플라스틱 재질의 지지구조물(${\varepsilon}_r=2.2$, 두께=5mm)에 방사용 도전체를 표면에 인쇄하는 방법으로 제작 되었다. 안테나의 급전 부는 FR-4 기판(t=1.0mm, ${\varepsilon}_r=4.7$)을 사용하여 제작하였다. 안테나와 급전부에 대한 시뮬레이션이 CST를 이용해서 이루어졌고, 이 결과에 따라 안테나와 급전부가 제작되었다. 동작 주파수 대역에서 안테나 특성은 -12dB 궤환 손실을 얻었고, 3.46dBic의 방사이득이 예측되었다. 시뮬레이션 결과를 바탕으로 2개의 안테나 샘플이 제작되었고, 이를 이용해서 안테나 특성을 측정하였다. 측정된 결과는 제안된 안테나가 소형기기에 적용하기에 적합할 것으로 예상되며, 향후 안테나 파라미터 최적화 과정을 거쳐 상용제품에 적용 가능한 융합형 안테나가 설계될 것이다.

Keywords

References

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