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 Study on Adjustable Base Station Antenna Based on Electrical Tilt for Null Steering

전기적 빔 조향기반의 기지국 안테나에 관한 연구

  • Lee, Vea-O (Department of Wireless Communication Engineering, Kwangwoon University) ;
  • Cheon, Chang-Yul (Department of Radio Science & Engineering, University of Seoul) ;
  • Chung, Young Seek (Department of Wireless Communication Engineering, Kwangwoon University)
  • 이비오 (광운대학교 전파공학과) ;
  • 천창율 (서울시립대학교 전기전자컴퓨터공학부) ;
  • 정용식 (광운대학교 전파공학과)
  • Received : 2012.06.05
  • Accepted : 2012.09.05
  • Published : 2012.10.31
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Abstract

In this paper, we propose an electrically tilting system based on a null-steering in order to solve the problem of the shadowing loss caused by the mechanically tilted antenna system in mobile services. Especially, we improve the downward shadowing loss by eliminating or moving the vertical beampattern nulls between $-30^{\circ}{\sim}0^{\circ}$ to be able to tilt the downward beampattern between $-10^{\circ}{\sim}0^{\circ}$. The antenna has 14.5 dBi gain and side lobe level (SLL) is lower than -18 dB within downward tilting range. The isolation of polarization is greater than 30 dB when running in electric tilt down to $-10^{\circ}$. To verify this paper, we made the base-station antenna for W-CDMA and beam tilting devices, and verified the performances.

본 연구에서는 기존의 기계적 조향 방식에 의한 이동 통신 서비스 음영 지역 문제점을 개선하기 위해서 배열 안테나 빔 패턴의 null-steering 기법에 기반한 전기적 빔 조향 장치를 연구하였다. 특히, 하향 $-10^{\circ}{\sim}0^{\circ}$ 이내에서 빔 조향이 가변될 수 있도록 기지국 안테나 수직 빔 패턴의 $-30^{\circ}{\sim}0^{\circ}$ 범위에 존재하는 null을 제거하여 하향 방향에서 전파 음영을 개선하였다. 이때 안테나의 요구 사양은 하향 조향각 조절 범위 내에서 14.5 dBi의 이득과 부엽 세기는 -18 dB 이하로 억제되어야 한다. 또한, 편파의 격리도는 30 dB 이상을 나타내어야 한다. 본 연구의 타당성을 보이기 위해 W-CDMA용 기지국 안테나 및 빔 조향 장치를 설계 제작하여 그 유용성을 보였다.

Keywords

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