| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device for achieving stable antenna characteristics in a inverse-F-type antenna device that is installed on a truck or the like and operates under a hostile environment such as vibration and shock. SOLUTION: Junction members 8a, 8b, and 8c are provided between a ground plate 1, radiation element 2, 3, and 4, and a radome 5 for greatly affecting the antenna characteristics of the inverse-F-type planar antenna device, respectively.
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