| 摘要 |
Two sensors 2, 3 are provided for detecting an interception object on respective different surfaces of device housing 1 of a portable radio device. Two antennas 4, 5 are provided in the state of having directivity in respective different directions in device housing 1. Also provided are switching unit 8 for selectively connect antenna 4 or 5 to transmit-receive unit 7 and control unit 6 for controlling the same. Detection signals of respective sensors 2, 3 are applied to control unit 6 in the state that device housing 1 is fitted to a human body, the fitting direction of device housing 1 is determined through the detection signals, and switching unit 8 is controlled such that one of antennas 4, 5 on the side not contact with the human body is selected.
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