偏置拋物面天線圓極化版圖成形波束工程理論的研究
CONTOURED BEAM ANTENNAS OF OFFSET PARABOLOID REFLECTORCIRCULARLY POLARIZED FEED ARRAY
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摘要: 本文根據(jù)矩形波導(dǎo)中隔片式圓極化器傳輸波型的漸變過程,導(dǎo)出了圓極化饋源的輻射場公式,并利用R.Mittra等作者提出的物理光學(xué)輻射積分Jacobi-Bessel級數(shù)展開方法對偏置拋物面天線圓極化版圖成形波束的工程理論進(jìn)行了研究。它包括:圓極化饋源輻射場公式;偏置拋物面電流等效投影孔徑布分;二次輻射場計(jì)算公式;版圖成形波束等效各向同性輻射功率(EIRP)工程計(jì)算公式;天線坐標(biāo)、版圖經(jīng)緯度坐標(biāo)與衛(wèi)星坐標(biāo)之間的變換關(guān)系;給出了七元饋源陣成形的我國西部版圖圓極化波束的數(shù)值結(jié)果,其EIRP等電平曲線是計(jì)算機(jī)自動(dòng)打印的,本文研究的理論方法可作為研制版圖成形波束天線各階段的基本分析工具。
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關(guān)鍵詞:
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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