Abstract
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° ～ 0° to be able to tilt the downward beampattern between — 10° ～ 0°. 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°. To verify this paper, we made the base-station antenna for W-CDMA and beam tilting devices, and verified the performances.Key words : Null-Steering, Electrical Tilt, Base Station Antenna, Phased Array, W-CDMA 「이논문은2011년도광운대학교교내학술연구비지원에의해연구되었음.」 광운대학교전파공학과(Department of Wireless Communication Engineering, Kwangwoon University) *서울시립대학교전기전자컴퓨터공학부(Department of Radio Science & Engineering, University of Seoul)․Manuscript received June 5, 2012 ; Revised August 27, 2012 ; Accepted September 5, 2012. (ID No. 20120605-068)․Corresponding Author : Young Seek Chung (e-mail : yschung@kw.ac.kr)
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