| 摘要 |
A feed probe ( 1 ), a semicylindrical sub-reflector ( 2 ) forming a primary radiator together with the feed probe ( 1 ), and a main reflector ( 3 ) arranged such that mirror surfaces of said main reflector ( 3 ) and the sub-reflector face across the feed probe ( 1 ) are all disposed on a ground plate (a recfector face) ( 4 ). The main reflector ( 3 ) has a predetermined focal point or focal line on which the feed probe ( 1 ) is located, and is mounted on the ground plate ( 4 ) at a predetermined installation angle theta. A converter ( 500 ) for converting linearly and circularly polarized waves is provided on the mirror surface of the main reflector ( 3 ). The converter ( 500 ) is composed of a plurality of grooves ( 510 ) and ridges ( 512 ) formed between the grooves, so that a wave component orthogonal to the grooves is reflected at the bottom of the grooves while a wave component parallel to the grooves is reflected on the ridge surface, thereby causing a phase difference according to the height H of the grooves when a radio wave is reflected on the main reflector to thereby perform linear to circular polarization conversion.
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