| 摘要 |
A primary radiator for a parabolic antenna includes a cylindrical horn antenna body widened towards an end opening in a cone shape, a horn cap provided at the end opening of the horn antenna body, and a plurality of cylindrical protruding portions formed of a dielectric. The protruding portions are provided on the inner wall surface of the horn cap, concentric with a central axis of the horn antenna body, and concentrically arranged with each other, and the height of an inner one is determined to be higher than an outer one. According to such a configuration, a primary radiator for a parabolic antenna configured to favorably suppress the VSWR up to a bandwidth of 1050 MHz can be provided.
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