| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and compact antenna device that can prevent a capacitance value from varying and has improved frequency stability in a planar type antenna device in which an antenna element is made of a metal plate. SOLUTION: The antenna device comprises: a dielectric substrate 2 having a conductive layer on the surface; the antenna element 5 that is arranged with a prescribed interval to the dielectric substrate 2 and is made of a metal plate; and a plurality of leg pieces 6 erected from the antenna element 5 to the dielectric substrate 2. The leg pieces 6 have a bent section 61 that opposes the conductive layer of the dielectric substrate 2 at the tip with a fixed interval. COPYRIGHT: (C)2008,JPO&INPIT
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