偏置抛物面天线圆极化版图成形波束工程理论的研究
CONTOURED BEAM ANTENNAS OF OFFSET PARABOLOID REFLECTORCIRCULARLY POLARIZED FEED ARRAY
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摘要: 本文根据矩形波导中隔片式圆极化器传输波型的渐变过程,导出了圆极化馈源的辐射场公式,并利用R.Mittra等作者提出的物理光学辐射积分Jacobi-Bessel级数展开方法对偏置抛物面天线圆极化版图成形波束的工程理论进行了研究。它包括:圆极化馈源辐射场公式;偏置抛物面电流等效投影孔径布分;二次辐射场计算公式;版图成形波束等效各向同性辐射功率(EIRP)工程计算公式;天线坐标、版图经纬度坐标与卫星坐标之间的变换关系;给出了七元馈源阵成形的我国西部版图圆极化波束的数值结果,其EIRP等电平曲线是计算机自动打印的,本文研究的理论方法可作为研制版图成形波束天线各阶段的基本分析工具。
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关键词:
Abstract: The approach for the Jacobi-Bessel series expansion of the physical opties radiation integral studied by R. Mittra et al. is extended to the case of eireularly polarized illumination, and a computation technique for the eireularly polarized contoured beam of the offset reflector antennas is analysed. This paper deals with the following pro-blems: the mathematical model of eireularly polarized feed, the equivalent distribution of reflector projected aperture, the secondary radiation field formula of offset parabolid reflector and the EIRP computation formula of the contoured beam. The EIRP/W contour-plot for the western zone coverage of the territory of China is given (illumination by 7-element feed array). -
J. R. Ullman, Pattern Recognition Techniques, London Butterworth,(1973). 2 S. Silver, Microwave Antenna Theory and Design, New York, McGraw-Hill, 1949, pp. 142-144. -
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