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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design of Electromagnetically Coupled Small Broadband Monopole Antenna with Vertical Ground Plane

수직 접지면을 가지는 전자기적 결합 급전 소형 광대역 모노폴 안테나의 설계

  • Kim Myung-Bum (School of Electrical and Computer Engineering, Ajou University) ;
  • Jung Jong-Ho (School of Electrical and Computer Engineering, Ajou University) ;
  • Choo Hosung (School of Electronic and Electrical Engineering, Hongik University) ;
  • Park Ikmo (School of Electrical and Computer Engineering, Ajou University)
  • 김명범 (아주대학교 전자공학부) ;
  • 정종호 (아주대학교 전자공학부) ;
  • 추호성 (홍익대학교 전기전자공학부) ;
  • 박익모 (아주대학교 전자공학부)
  • Published : 2005.06.01
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Abstract

This paper presents a folded stripline-fed small broadband disk-loaded monopole antenna with vertical ground plane. The bandwidth of the proposed antenna can be enhanced by electromagnetic coupling between the shorted rectangular disk and the probe with folded strip line. The measured impedance bandwidth of the proposed antenna is $37.6\%$ for $VSWR\leq2$ with the center frequency at 2.313 GHz and has the physical dimensions of only $11mm\times11mm\times11mm$ which corresponds to the electrical length of $0.085\lambda_0\times0.085\lambda_0\times0.085\lambda_0$. For improving the radiation pattern characteristics, rectangular slits are inserted in the vertical ground plane. Rectangular slits affect the currents distribution on the ground plane, so that the antenna radiation in the direction of the ground plane is reduced more than 3 dBi. Gain of the antenna is approximately 2.6 dBi within the bandwidth.

본 논문에서는 수직한 접지 면에 연결된 단락된 사각 디스크와 폴디드 스트립 선로 급전을 전자기적으로 결합한 소형 광대역 디스크-로디드 모노폴 안테나를 제안하였다. 제안한 안테나는 단락된 사각 디스크 아래에 폴디드 스트립 선로를 위치시킴으로써 소형$(0.085\lambda_0\times0.085\lambda_0\times0.085\lambda_0)$으로 구현할 수 있으며, 단락된 사각 디스크의 공진과 사각 폴디드 스트립 선로 급전의 공진을 결합함으로써 중심 주파수 2.313 GHz에서 $VSWR\leq2$를 기준으로 약 $37.6\%$의 넓은 대역폭을 이룰 수 있다. 또한 수직한 접지면에 의한 복사 패턴의 왜곡 현상을 개선하기 위하여 접지면에 직사각형의 슬릿을 삽입함으로써 후방 복사를 3 dBi 이상 감소시켰다. 설계한 안테나는 일반적인 모노폴 안테나와 유사한 전방향성의 복사 패턴을 보이며 이득은 대역폭 내에서 약 2.6 dBi의 값을 가진다.

Keywords

References

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