| 摘要 |
An object of the invention is to provide a portable radio apparatus capable of attaining a higher level of antenna performance in each of a plurality of frequency bands, without making the portable radio apparatus larger. A ground wire, which is set with an electrical length resonating at a second frequency band, which is different from that of an antenna element 14, of two or more carrier frequency bands in which a wireless circuit on a circuit board 11 operates, is arranged between a ground pattern of the circuit board 11 and the antenna element 14 and the operating states of the ground wire 15 are switched by a line switching switch 16, depending on the using frequency band. Thereby, it is possible to attain the higher level of antenna performance in each of the first frequency band with which the antenna element 14 resonates and the second frequency band with which the ground wire 15 resonates. In addition, the ground wire 15 is arranged in a space that is required to secure the characteristics of the antenna element 14. Accordingly, it is not necessary to secure a new mount space for the ground wire 15, so that the portable radio apparatus 1 is not enlarged.
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