| 摘要 |
PURPOSE:To avoid the increase in the amount of interference between beams due to the deterioration of side lobe characteristics, by increasing the antenna effieicncy with the correction so that the phase of electromagnetic waves on the antenna opening can be uniform for the sub-reflection mirror surface. CONSTITUTION:The antenna is two-dimensionally provided with the same method as the offset type multi-beam antenna at the surface including the foci 3, 3'. As a result, the curve crossing between each mirror surface of the main reflector and sub- reflector 1 and 2 and the vertical surface perpendicular to the progressing direction 5 of electromagnetic waves is determined. Next, the curve which is made with the turning the curve to the main reflector 1 around the center axis 6 is taken as the mirror surface of the main reflector 1. Further, the communication path length of electromagnetic waves emitted from the primary radiator 4 on the focus 3 to the vertical surface to the progressing direction 5 via the sub-reflector and main reflector can be uniform at the antenna aperture to the utmost, and that emitted from the primary radiator 4' on the focus 3' to the vertical plane to the progressing direction 5' via the sub-reflector and main reflector can be uniform to the utmost at the entire antenna aperture. |
