| 摘要 |
PROBLEM TO BE SOLVED: To improve the directivity and to reduce the current on a housing while keeping the input impedance of an antenna low. SOLUTION: This is the antenna structure of a radio communication device 50 having a housing 51 containing an electric circuit 11 and an extension antenna 30 fitted to the housing 51. While the drawing-out length of the extension type antenna 30 from the housing is adjusted to a specific quantity, the antenna elements 1 and 6 of the extension antenna 30 are electrically connected to the electric circuit 11 through feed terminals 3 and 7. At the same time, the electric lengths of upper parts 1b and 6a and lower parts 1a and 6b of the respective antenna elements 1 and 6 across the feed terminals 3 and 7 are set independently of each other. The upper parts 1b and 6a of the respective antenna elements 1 and 6 across the feed terminals 3 and 7 are set to electric length 3/8λand the lower parts 1a and 6b of the respective antenna elements 1 and 6 are set to electric length 1/8λ.
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