Closed-loop antenna impedance tuning system and driving

A driving method of an impedance tuning system, comprising:

• receiving an input reflection coefficient generated based on a coupled signal received from a bi-directional coupler;
• calculating an output reflection coefficient with respect to an antenna based on a circuit characteristic value which is calculated based on an impedance value of a passive element comprised in each of a plurality of stages of an antenna impedance tuner circuit connected between the bi-directional coupler and an antenna, and the input reflection coefficient;
• determining an optimal tune code to correspond to the output reflection coefficient and the input reflection coefficient;
• and
• controlling the antenna impedance tuner circuit based on the optimal tune code.

A driving method of a impedance tuning system, comprising:

• dividing an antenna impedance tuner circuit connected between an antenna and a bi-directional coupler into a plurality of stages;
• obtaining antenna impedance tuning (AIT) data indicating characteristics with respect to each of the plurality of stages;
• calculating a circuit characteristic value comprising an impedance value of a passive element of the AIT data included in each of the plurality of stages;
• and
• storing the circuit characteristic value for use in real time impedance tuning of the antenna impedance tuner circuit.