| 摘要 |
PROBLEM TO BE SOLVED: To make compact a primary radiator which sends and receives a circularly polarized wave by making the overall length short. SOLUTION: A retaining part 2a of a dielectric feeder 2 is fixed in a rectangularly sectioned waveguide 1 and a radiation part 2b of the dielectric feeder 2 is projected to the outside from the opening end of the waveguide 1. The retaining part 2a have a couple of arcuately sectioned curved surfaces 5 converging into the waveguide 1, and both edge parts of the retaining part 2a are fixed to corner parts on a diagonal of the waveguide 1 in the waveguide 1 and the center part of the retaining part 2a is made thinner than both the edge parts. Consequently, the retaining part 2a has both the functions of a phase conversion part and an impedance conversion part and is in a shape along the intensity distribution of an electric field.
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