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    Repeaters for multibeam satellites with channels divided in subchannels and interbeam switching
    1.
    发明公开
    Repeaters for multibeam satellites with channels divided in subchannels and interbeam switching 失效
    对于卫星多波束天线信道的中继器被分成子信道和光束开关

    公开(公告)号：EP0760561A3

    公开(公告)日：1998-05-13

    申请号：EP96113034

    申请日：1996-08-13

    Applicant: COM DEV LTD

    Inventor： PEACH ROBERT ,  MILLER NIGEL ,  TAILOR BHARAT ,  ALI KAMAL ,  BEAUCHAMP GARY ,  LAM SIMON ,  LAZARIS-BRUNNER KEN

    IPC: H04B7/204

    CPC classification number: H04B7/2041

    Abstract: A repeater for a multibeam communications satellite combines the features of coaxial channel interbeam switching and subchannelization of some of the channels. In one embodiment described, the input radio-frequency signals from the input beams are fed through the input multiplexers to form channels. Some, but not all, channels are subsequently subchannelized for interbeam switching. In another embodiment of the invention, a portion of the incoming radio frequency signals bypasses the input demultiplexer and is filtered for noise-limiting reasons, converted down to an intermediate frequency and then subchannelized using SAW filters. The specification also teaches that digital techniques can be used to obtain the same results. Especially in the case of satellites with a large number of beams and a large number of channels, it is not necessary to have full interbeam switching of all the subchannels derived from one channel: instead, the specification proposes the use of parallel configurations of smaller, less complex switching networks.

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