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根据卫星通信总体设计的技术、战术指标要求,选择天线的类型。既要考虑天线技术的先进性,又要考虑结构的美观简单及经济耐用。卫星通信系统中对天线的要求是高增益低噪声(G/T↑)。我们确定采用改进型卡塞格伦天线,初级馈源为辐射圆对称波束的复合式多模喇叭。改进型卡塞格伦天线也是国际上七十年代广泛采用的天线新技术,它使天线效率在卫星通信频带(4/6GHz)内达到65％以上(天线口径大小为中等以上)。本天线要求双频区圆极化收发双工,所以整个天线由主反射面、副反射面、复合式多模
According to the overall design of satellite communications technology, tactical indicators require the choice of the type of antenna. It is necessary to consider the advanced antenna technology, but also consider the structure of the simple and beautiful and durable. The antenna requirements for satellite communications systems are high gain, low noise (G / T ↑). We determined that the improved Cassegrain antenna, the primary feed for the radiation circular symmetrical beam composite multi-mode speaker. The improved Cassegrain antenna is also a new antenna technology widely used in the world in the seventies. It makes the antenna efficiency more than 65% (the antenna diameter is medium or above) in the satellite communication frequency band (4 / 6GHz). The antenna requires double-frequency circular transmission duplexing, so the entire antenna from the main reflector, sub-reflector, composite multi-mode