| 摘要 |
PROBLEM TO BE SOLVED: To properly realize a desired radiation gain in a horizontal direction when mounting a planar antenna on a vehicle. SOLUTION: A hole 13 is formed to a body 12 and the planar antenna 14 is placed so that its parts corresponding to inner circumferential parts 13a, 13b of the hole 13 are placed between a radiation element 15 and a ground plate 16. Since an electric field E is produced so that the electrical lines of force emitted from the radiation element 15 is formed orthogonal to a position in the body 12 and close to the planar antenna 14, the component of the electrical lines of force acting in a vertical direction is not reduced and the antenna can maintain the directivity in the horizontal direction so as to properly realize the desired radiation gain in the horizontal direction. COPYRIGHT: (C)2004,JPO
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