| 摘要 |
In a broadcasting satellite, signals transmitted through an up transmission line of a Ka band, which includes a plurality of communication channels, are received by a Ka-band antenna. The signals received by the antenna are passed through band-pass filters 12 to thereby extract a broadcasting signal transmitted through each communication channel. Those of the thus-extracted broadcasting signals, which have been transmitted through predetermined communication channels, are synthesized by each of synthesizers 15, then amplified by a corresponding one of high power amplifiers 16, and output to a corresponding one of a plurality of primary radiators 53 employed in an S-band antenna. The S-band antenna transmits each synthesized signal to a predetermined area that corresponds to a corresponding primary radiator 53. Thus, the system can be made to a simple structure, and the service area can be changed for each broadcasting signal. <IMAGE> |
