| 摘要 |
In a movable radio terminal device, a switching circuit connects, in response to one of first and second matching switching control signals, an antenna 2 to one of first and second impedance matching circuits. The controlling unit produces and supplies, at every predetermined time interval, the first and second matching switching control signals to the switching circuit, respectively, to make a memory device memorize, as first and second level signals having first and second level values, detected level signals from a level detecting circuit when the switching circuit connects the antenna to the first and second impedance matching circuits, respectively, when the detected level value from the level detecting circuit is smaller than one of the first and second level values that corresponds to the second greatest level value in the first and second level values, and when the controlling unit is supplied with a human body contact discriminating signal from a human body contact discriminating circuit. The controlling unit selects, as a selected level value, one of the first and second level values that is greatest in the first and second level values. The controlling unit produces and supplies one of the first and second matching switching control signals that corresponds to the selected level value to the switching circuit.
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