论文标题
孔型天线的天线效率的分解：梁耦合和两个溢出物
Factorization of Antenna Efficiency of Aperture-type antenna: Beam Coupling and Two Spillovers
论文作者
论文摘要
天线效率是射电望远镜的最重要人物之一，尤其是在毫米波长或较短波长下，即使对于多冰射电望远镜也是如此。为了分析具有梁波导的系统，在标量波近似的框架内考虑了由两个孔组成的无损天线。我们发现，可以通过第二个光圈上的场分布来评估天线效率，并且天线效率分为三个因素：束耦合，透射溢出和接收溢出的效率。该分解适用于带有梁波导的一般孔径天线，并且可以将光圈效率与瞳孔函数相关联。我们通过光学仿真来数字确认我们的分解。该评估使我们能够管理畸变，并在设计多台射电望远镜的设计中很有用。
Antenna efficiency is one of the most important figures-of-merit of a radio telescope for observations especially at millimeter wavelengths or shorter wavelengths, even for a multibeam radio telescope. To analyze a system with a beam waveguide, a lossless antenna consisting of two apertures in series is considered in the frame of the scalar wave approximation. We found that the antenna efficiency can be evaluated with the field distribution over the second aperture, and that the antenna efficiency is factorized into three factors: efficiencies of beam coupling, transmission spillover, and reception spillover. The factorization is applicable to general aperture-type antennas with beam waveguides, and can relate the aperture efficiency to the pupil function. We numerically confirmed our factorization with an optical simulation. This evaluation enables us to manage the aberrations and is useful in design of multibeam radio telescopes.
