| 摘要 |
An antenna device includes an insulating base and an antenna element made of a metal plate fixed onto the base. The base has a surface having a recess therein having a bottom. A projection projects from the bottom of the recess. The antenna element has a hole in which the projection is inserted, and is fixed onto the surface of the base with the projection by swage locking. The antenna element includes a step portion provided on the bottom of the recess and a peripheral portion coupled to the step portion and provided on the surface of the base. The step portion has the hole provided therein. The projection has a height not larger than a height of the first peripheral portion of the antenna element. The antenna device has preferable antenna characteristics even while being accommodated in a small installation space.
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