| 摘要 |
PURPOSE:To receive different left-handed and right-handed circularly polarized wave signals from satellites of different positions by using one satellite receiving antenna, by utilizing a difference of reflection steerings of a left-handed circularly polarized wave and a right-handed circularly polarized wave by an asymmetrical reflector. CONSTITUTION:In case when a primary radiator has been placed in a focus of a reflector of an offset parabolic antenna, a peak direction of a main beam of right-handed and left-handed circularly polarized waves is deviated from an asymmetry of the reflector. The reflector 1 is cut off from the rotary parabolic surface so that said deflection quantity becomes large. Also, a right-handed circularly polarized wave primary radiator 2 is placed on the right of a focus 6 and a left-handed circularly polarized wave primary radiator 3 is placed on the left of the focus 6. In this case, as for the moving extent of the radiators 2, 3, theta in the figure is moved and placed so that theta+theta1 becomes equal to the deviation quantity of the beam. In this way, the direction of the main beam of both the right-handed and left-handed circularly polarized waves is turned to the direction of satellites 4, 5 for sending out the right-handed and left-handed circularly polarized waves, respectively. Accordingly, by a reversible theorem of the antenna, the two primary radiators 2, 3 can receive a radio wave which has been transmitted from the satellite by scarcely lowering the gain.
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