| 摘要 |
PURPOSE: An impedance control device of an adaptive tuning antenna circuit is provided to control the impedance of the antenna by using one power detector. CONSTITUTION: A tuner(210) controls the impedance of an antenna. The tuner supplies the transmission signal outputted from a coupler to the antenna. A matching unit(230) matches with the power outputted from the coupler. A power detector(240) detects the level of the reflected power outputted from the coupler. A control unit(250) controls the impedance of the matching unit. The control unit controls the impedance of the tuner. |
