| 摘要 |
PURPOSE:To reduce a cross polarization component caused by a main reflector, by disposing a dielectric lens between the main reflector and the primary radiator. CONSTITUTION:The main reflector 1 consists of a part of the paraboloid of revolution whose point F2 and Z axis are a focus and a symmetrical axis of rotation, respectively, and its offset angle and aperture half angle are alpha and theta0, respectively. The primary radiator 2 and the radio wave lens system 3 are arranged so that as for the main reflector 1, one focus F2 of the radio wave lens system 3 is made to conform with the focus of the main reflector, and the axis 7 is inclined to the Z axis by an angle of alpha degrees. A light beam 50 passing through the beam axis of the primary radiator 2, and the light beams 51, 52 making an angle of (theta) against said light beam 50 become light beams 53, 54, and 55, respectively, after they have passed through the radio wave lens system 3, the respective light beams all become those which go forward in the direction of an Z axis after they have been reflected by the main reflector 1, and they join at the points C, A and B, respectively, on the aperture plane. |
