| 摘要 |
PURPOSE:To decrease the interference due to differently polarized wave automatically by adjusting the amplitude and phase of a differently polarized signal, the synthesizing the adjusted differently polarized signal and a main polarized signal and extracting the differently polarized signal from the said synthesis signal so as to minimize the level thereby controlling the said adjusting means. CONSTITUTION:A horizontally polarized wave H component is fed directly to a synthesizer 4 and a vertical polarized wave V component is applied to the synthesizer 4 via a variable attenuator 2 and a variable phase shifter 3. In this case, the reception signal of the polarized wave H is used as the main polarized wave signal and the reception signal of the polarized wave V becomes the differently polarized wave signal. Thus, the level and phase of the polarized signal component of an adjacent channel are adjusted by a variable attenuator 2 and a variable phase shifter 3, and the attenuation of the variable attenuator 2 and the phase shift of the variable phase shifter 3 are controlled automatically by a control circuit 6 so as to minimize the level of the vertical polarized signal component extracted by a BPF5. Thus, even if the reception level of the main polarized wave signal is decreased, the interference by the differently polarized signal is reduced. When the differently polarized signal exists at both sides, the constitution shown in one dash chain lines is added. |
