| 摘要 |
A decrease in antenna currents that are oriented in opposite directions and that flow through enclosures and enhancement of an antenna characteristic are accomplished without impairment of a design characteristic of the enclosures and while being made feasible to achieve a reduction in size and thickness. In a portable radio that has an upper enclosure 11, a lower enclosure 12, and an intermediate enclosure 13 and that can assume a portrait open state and a landscape open state, when the landscape open state is achieved as a result of turning action of a second hinge member 32, an antenna element 15 of the upper enclosure 11 is connected to a radio circuit 23 on a second circuit board 22 of the lower enclosure 12 by way of a connection line 25. A first hinge member 31 in the intermediate enclosure 13 is earthed to a ground of the second circuit board 22 of the lower enclosure 12 by way of a connection conductor 26 and a reactance element 35. The first hinge member 31 is thereby caused to act as an earth line, to thus reduce opposite-phase antenna currents flowing through the upper enclosure 11 and the lower enclosure 12 that oppose each other.
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