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1.前言在卫星通信中为满足多样化的要求,希望实现能共用多个频段的卫星。然而,星载天线在重量和尺寸方面受到限制。因此,用一块主反射镜能够共用多个频段这是最理想的。一般就卫星通信来讲,在上行和下行线路中使用一对频段(例如6/4千兆赫频段),但这里所讲的多频段是意味着使用两对以上即四个频段以上。组成多频段共用天线认为有下述三种方法,①使用单一的初级辐射器,通过使该辐射器具有群分波机能来实现多频段共用的天线。此种天线中有喇叭反射器形天线;使用双重
1. Introduction In order to meet the diverse requirements of satellite communications, it is hoped that satellites that share multiple bands will be realized. However, spaceborne antennas are limited in weight and size. Therefore, the use of a main reflector can share multiple bands which is ideal. In general, for satellite communications, a pair of frequency bands (eg, 6/4 GHz band) are used in the uplink and downlink, but the multibands described here mean that more than two pairs, ie more than four, are used. To form a multi-band shared antenna, the following three methods are considered. (1) A single primary radiator is used to realize a multi-band shared antenna by making the radiator function as a group-separated wave. There are horn reflector antennas in this antenna; dual use