| 摘要 |
PROBLEM TO BE SOLVED: To provide a primary radiator for a parabola antenna of a structure capable of restraining VSWR well up to a bandwidth of 1,050 MHz. SOLUTION: The primary radiator for the parabola antenna includes: a cylindrical horn antenna body 11 expanded in a conical shape toward a tip opening; a horn cap 12 arranged at the tip opening of the horn antenna body; and a plurality of cylindrical protrusions 15 formed on an inner wall surface of the horn cap 12, facing the end opening, concentric with the center axis of the horn antenna body 11, arranged concentrically with one another, formed by setting the heights of inner ones larger than the heights of outer ones, and formed of a dielectric material. COPYRIGHT: (C)2009,JPO&INPIT
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