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频率复用技术是利用天线和馈线系统内的两个正交极化波间的隔离特性,在同一个频率上传输两个不同的信息的技术。第一代国际通信卫星“晨鸟”是在1965年正式投入使用的。由于卫星通信具有覆盖区域大、通信距离远、通信容量大、通信质量高、可靠性好、投资费用省等优点,卫星通信的通信量迅速增加。从1965年至1985年,其通信容量的年间增长率一直保持着24～35%的速度,因此出现了“频谱拥挤”的问题。解决这一问题的途径有两种:1.提高卫星通信的载波频率,从现在使用的6/4GHz 和14/11GHz 频段扩展到40/30GHz 频段,以
Frequency multiplexing technology is the use of the antenna and feeder system within the two orthogonal polarization between the isolation characteristics of the same frequency on the transmission of two different information technology. The first generation of international communications satellite “morning bird” was officially put into use in 1965. Because satellite communication has the advantages of large coverage area, long distance of communication, large communication capacity, high communication quality, good reliability and low investment cost, the communication volume of satellite communication rapidly increases. From 1965 to 1985, the year-on-year growth rate of its communication capacity has been maintained at a rate of 24% to 35%. As a result, the problem of “spectrum congestion” has arisen. There are two ways to solve this problem: 1. To increase the carrier frequency of satellite communications from the currently used 6 / 4GHz and 14 / 11GHz frequency bands to the 40 / 30GHz frequency band to