| 摘要 |
Disclosed are an antenna tuner and a method for adjusting antenna impedance. The antenna tuner includes a reference impedance resistor, a first coupler having an isolated port connected to one end of the reference impedance resistor, a second coupler having an input port connected to an output port of the first coupler and an output port connected to the antenna, and an impedance adjusting device group connected to the second coupler to adjust impedance of the antenna. An impedance controller generates an impedance adjustment control signal according to a first voltage applied to a coupled port of the first coupler, and a second voltage applied to a coupled port of the second coupler to provide the impedance adjustment control signal to the impedance adjusting device group. |
