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卫星天馈系统作为卫星电视的窗口,在卫星电视接收系统中占有非常重要的地位,卫星天线的优劣及其馈源的对焦状况对卫星节目质量起着至关重要的作用。卫星的下行信号一般有两种极化方式:即线极化与螺旋极化。卫星天线的对焦要准确地将馈源口调整到抛物面天线的焦点位置。
As a window of satellite TV, satellite antenna system occupies a very important position in the satellite television receiving system. The advantages and disadvantages of the satellite antenna and the focusing status of the feed satellite play an important role in the satellite program quality. The satellite downlink signal generally has two kinds of polarization: linear polarization and helical polarization. The focus of the satellite antenna to accurately adjust the feed port to the focus of the parabolic antenna position.