Summary
International Symposium on Antennas and Propagation
2010
Session Number:3TC2
Session:
Number:3TC2-4
Influence of Source Antenna Beamwidth on Far-Field Measurement Method Using Numerical Compact Range
Ryo Yamaguchi, Kazuhiro Komiya, Keizo Cho,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
A cellular base station antenna has a narrow beamwidth in the vertical plane because the length of the antenna is longer than 10λ. While generally long distance measurements are needed to measure an electrically long antenna with high accuracy, some measurement methods in a short-range anechoic chamber have been used. For this purpose, the compact range method [1-2] and near-far field transformation method [3-6] are very popular. However, since additional hardware, which is large or expensive, is needed to employ these methods, it is difficult to measure the far-field pattern of an antenna compared to using conventional pattern measurement methods in an anechoic chamber. In order to overcome this problem, a far-field measurement method was proposed for electrically long antennas using a conventional pattern measurement system when the measurement distance is not sufficient in an anechoic chamber [7]. Since the employed source antenna is treated as a numerical compact range in this method, a virtual quasi-plane wave is generated around the antenna under test (AUT) to obtain the far-field pattern. We clarified the validity of the proposed method that the far-field can easily be obtained in a short range anechoic chamber without extra equipment. Although the half-power beamwidth of the source antenna is treated as isotropic [7], in this paper, which further investigates the proposed method, the influence of the beamwidth is shown in order to clarify the condition for the source antenna.