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一、前言对于卫星装载用天线来说,最有效的频率复用方法就是多波束天线。这种天线的设计方法有多种。本文旨在介绍由旋转对称的2枚反射镜及多个喇叭组成的多波束天线。该天线从中心轴离开镜面形状位置上的喇叭所产生的波束效率最大。本文也介绍了利用试制模型天线所测量的结果。二、波面偏离与镜面设计条件一般的卡塞格伦天线,在将喇叭辐射的球面波相位中心置于焦点上之情况下,其开口面上的波面形成平面,并且天线的效率最大。而在焦点附近放置几个喇叭构成多波束天线的情况下,随着喇叭离开焦点,使开口面上的波
I. INTRODUCTION For the satellite loading antenna, the most efficient method of frequency reuse is the multi-beam antenna. There are many ways to design this antenna. This article aims to introduce a multi-beam antenna consisting of two mirror-symmetrical mirrors and multiple speakers. The antenna produces the most efficient beam from the central axis at the mirror-shaped position of the horn. This article also describes the results measured with a trial model antenna. Second, the wavefront deviation and the mirror design conditions General Cassegrain antenna, the horn radiating spherical wave phase center placed in focus case, the open surface of the wave plane to form a plane, and the maximum efficiency of the antenna. In the case of placing several speakers near the focal point to form a multi-beam antenna, as the horn leaves the focus, the wave on the open face