| 摘要 |
PURPOSE:To provide the structure of a receiver permitting a holder to be formed of metallic material without causing the deterioration of receiving performance, and the structure of the holder. CONSTITUTION:In the metallic holder accommodating the receiver with built-in antenna so that the receiver can be freely attached/detached, the receiver is provided with a built-in antenna 5, a receiving circuit 4, a first matching circuit 6 for the matching between the built-in antenna and the receiving circuit, a second matching circuit 7 for the matching between the built-in antenna and the metallic holder, a first switch SW1 switching and connecting the output terminals of the built-in antenna and metallic holder to the respective input terminals of the first and second matching circuits 6 and 7 and a second switch SW2 switching and connecting the respective output terminals of the first and second matching circuits 6 and 7 to the receiving circuit 4, and the metallic holder is provided with a contact bar operating the first and second switches SW1 and SW2 when it accommodates the receiver.
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