半球壳型介质输出窗辐射图研究
Radiation investigation of Gauss feed covered by a hemispherical-shell microwave windows
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摘要: 利用球矢量波函数的线性组合导出了球壳并矢格林函数;使用并矢格林函数方法，取5阶、球面波半张角8°、口面半径0.2 m、频率为10 GHz的高斯场，分析了半球壳型输出窗在束腰分别取0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8情况下对高斯口面场远场辐射图的影响。分析表明:当束腰较小时（取0.3,0.2），半球壳型输出窗对高斯口面场的辐射图影响较小；当束腰较大时(取0.8,0.7,0.6)，辐射图的旁瓣升高，主瓣变窄，反射场对口面场的影响较大。半球壳型输出窗适用于束腰较小的高斯馈源，对于束腰较大的高斯馈源则不适用。Abstract: The Dyadic Green’s function about spherical-shell microwave windows is presented in this paper, with which the influence on radiation pattern caused by the hemispherical-shell microwave windows is analyzed. The results show that the effect on the radiation pattern is prominent with the enhanced side lobe and the narrowed main lobe when the beam waist of Gauss distribution field is large, while the effect weakens as the beam waist decreases, thus it is concluded that the hemispherical-shell microwave windows are fit for the Gauss feed with small beam waist but unfit for the feed with large beam waist.
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Key words:
- microwave windows /
- dyadic green’s functions /
- radiation pattern /
- beam waist /
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