| 摘要 |
PURPOSE:To attain a desired directivity pattern while ensuring the sufficient strength of an antenna board by providing a dielectric layer acting like an antenna board and an earth plate to both sides of a dielectric board, and providing plural short-circuit parts short-circuiting both the conductor layers at the middle linearly. CONSTITUTION:The conductor film forming the earth plate 1 is formed to one face of the dielectric board 7 of a prescribed thickness and the conductor film forming the antenna board 3 is formed on the other side. Plural through poles 8 are formed to the dielectric board 7 and a conductor made short-circuit member 2 connecting the earth plate 1 and the antenna board 3 electrically is provided in the inside of each through hole 8 and a coaxial connector forming feeding points 5, 6 is provided between the antenna board 3 and the earth plate 1 at a symmetrical position around the short-circuit member 2. Thus, the mechanical strength is improved and the desired directivity pattern is attained by keeping the interval between the earth plate and the antenna board accurately and the simple manufacture process is attained by reducing number of components.
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