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前言最近,对微波卫星链路上冰粒的交叉极化的重要性已得到重视(1,2),而冰粒的交叉极化几乎完全是由于极化主平面之间的差相移引起的。根据瑞利散射理论,该相移预计同频率成正比,对工作在10千兆赫以上的频率复用系统这将是非常严重的问题。在4/6千兆赫上雨引起的相移也是一个主要影响。COMSAT的工作人员已在这两个较低的频段上做出了一个具有两个可变参量的自适应对消系统,并作了实验。这个设备在
Preface Recently, the importance of cross-polarization of ice particles on a microwave satellite link has been highlighted (1, 2), whereas the cross-polarization of ice particles is almost entirely due to the poor phase shift between the polar principal planes . According to Rayleigh scattering theory, the phase shift is expected to be proportional to the frequency, which is a serious problem for frequency reuse systems operating above 10 gigahertz. The phase shift caused by rain on 4/6 GHz is also a major influence. COMSAT staff have made and experimented on an adaptive cancellation system with two variable parameters in these two lower bands. This device is on