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1、前言近年来,随着数字卫星通信技术的进步,以及星载天线和转发器性能的日益提高,各方面都在计划利用天线口径为2米以下的超小型地球站(以下称微型终端)的各种卫星通信系统;其中一部分已付诸实用。本文首先介绍微型终端的现状与所要求的性能;而后设想需要低旁瓣的天线的情况,叙述波动的镜面修整方法,展示镜面修整偏置格里高利天线的设计例子和所试制模型天线的辐射特性。
1. Introduction In recent years, with the advancement of digital satellite communications technology and the increasing performance of satellite-based antennas and transponders, all parties are planning to utilize ultra-miniature earth stations (hereinafter referred to as miniature terminals) with an antenna diameter of 2 meters or less, Of the various satellite communications systems; some of which have been put into practical use. This article first introduces the current state and required performance of the micro-terminal; then, the case of an antenna requiring a low sidelobe is conceived, a method of mirroring the fluctuation is described, a design example of the mirror-trimmed biased Gregorian antenna and the radiation of the prototype antenna characteristic.