| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna capable of covering only a fine area. SOLUTION: The antenna 11 is formed of an internal conductor 12, an insulating body 13 provided at the outer periphery of the body 13, an external conductor 14 provided at the outer periphery of the body 13 and having plural annular projections 14a consecutive in a longitudinal direction, and plural slots 15 formed at the projections 14a and exposing the body 13 from the conductor 14, which is smooth and cylindrical.
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