| 摘要 |
PROBLEM TO BE SOLVED: To realize the antenna suitable for a mobile body, utilizing a geostationary satellite or a simple earth station for emergency disasters, in which a rotary V-shaped elevating angle directivity is provided for a circularly polarized wave and its direction elevating angle is variable. SOLUTION: The shape of the conical helix antenna consisting of four antenna elements 11 -14 is formed to be a thin and long frustum of a circular cone. That is, an apex angle of the cone (twice the frustum slope angle) is selected to be 1.8 deg. or 2.4 deg., pitch anglesβ1 -β4 of the antenna elements 11 -14 are selected to be 45 deg. or 60 deg., and upper ends adjacent to each other among upper ends of the antenna elements 11 -14 are fed with opposite polarity.
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