| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna system where effect of a leakage noise from a radio unit circuit is reduced to obtain excellent communication quality in a configuration in which a radio and an antenna are integrated. SOLUTION: The antenna system consists of a dipole antenna 14 placed closely to a surface of a metallic casing incorporating a radio unit circuit and consisting of two 1/4 wavelength elements 21, 22 whose opposed ends are used for feeding points 23, 24, a short circuit element 15 that short-circuits between the 1/4 wavelength elements 21, 22, and a coaxial feeder 16 consisting of an outer conductor 25 and a center conductor 26 whose one-side ends are respectively connected to the feeding points 23, 24 and connecting the feeding points 23, 24 and the radio circuit. The coaxial feeder 16 is arranged along part of the 1/4 wavelength element 21 and the short circuit element 15, led out from the middle of the short circuit element 15 and the outer conductor 25 is electrically connected to part of the 1/4 wavelength element 21 and the short circuit element 15.
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