| 摘要 |
PROBLEM TO BE SOLVED: To secure excellent receiving sensitivity even if an antenna is installed horizontally to the ground surface. SOLUTION: An inverted F-shaped antenna 23 is provided between a first metallic plate 21 serving a ground electrode and a second metallic plate 22 disposed oppositely to the plate 21. At least one part of the plate 22 is formed into a curved shape so as to form projection protruding to the opposite side of the side where the plate 21 is disposed. Since a reception electrode or the second plate 22 has a curved surface shape protruding to the opposite side of the side where the ground electrode or the plate 21 is disposed, higher sensitivity is exhibited in a slanted direction to an antenna body.
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