Antenna module

An antenna module, comprising:

• an antenna with a feeding point;
• a tunable matching circuit electrically connected between the antenna and a power amplifier and configured to provide a loading impedance, wherein the tunable matching circuit comprises a plurality of tunable impedance elements connected to each other and electrically connected to the feeding point as well;
• a power detector electrically connected between the tunable matching circuit and the power amplifier and configured to detect a power indicator;
• and
• a control unit electrically connected to the tunable matching circuit and the power detector and configured to read the power indicator and a receiver signal strength indicator so as to generate a control signal for the tunable matching circuit, which consistently changes the loading impedance to achieve impedance matching, wherein the power indicator and the receiver signal strength indicator forms a communication quality function CQ, the control signal changes the loading impedance to maximize the communication quality function CQ.