| 摘要 |
PROBLEM TO BE SOLVED: To obtain stable communication characteristics by suppressing variance in antenna performance when used at a pole storage position. SOLUTION: This structure has a device casing 52 which has a communication circuit inside and has a fitting hole opened in the pole moving direction, a repeating metal feeder 2 which is fixed in the apparatus casing 52 and has a pole hole 2c opened along the axis of the fitting hole, and an antenna 3 having an antenna pole 3a which is inserted into the repeating metal feeder 2 and able to move in and out of the pole hole 2c and an antenna top 3b which is exposed to outside the device casing 52, and the antenna pole 3a is stored in the apparatus casing 52 by making the antenna top 3b of the antenna 3 abut against the opening peripheral edge of the pole hole 2c. Then recesses 4 and 7 and protrusions 5 and 8 for antenna positioning which can engage each other are provided between the abutting surface of the antenna top 3b and the opening peripheral edge of the pole hole 2c.
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