| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-frequency shared antenna that can minimize mutual effect of two antennas. SOLUTION: A 1st antenna 1-1 and a 2nd antenna 1-2 are placed in the inside of an antenna sheath 1-0, power is supplied to the 1st antenna 1-1 through a coaxial cable 1-3, a support insulator 1-7 supports the 2nd antenna 1-2 and the coaxial cable 1-3 in a way that the coaxial cable 1-3 passes through the center of the 2nd antenna 1-2. A 1st wireless communication circuit section 3-l and a 2nd wireless communication circuit section 3-2 are respectively connected to the antennas 1-1, 1-2, the 2nd antenna 1-2 easily excites an operating section that exists in the coaxial cable 1-3 with a length of a half wavelength, the antenna gain is increased, the antenna gain of the 1st antenna 1-1 is nearly equal to the antenna gain of the 2nd antenna 1-2, and the stable antenna directivity and the stable antenna gain can be ensured without deteriorating the directivity and the gain.
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