An consideration on equivalent circuit of wireless power transmission

An equivalent circuit of wireless power transmission is discussed. We demonstrate that an input impedance of the wireless power transmission is expressed by a simple equivalent circuit. The equivalent circuit spells out how the resonant frequency is determined. The parameters in the equivalent circuit is found by using genetic algorithm so that the input impedance calculated by method of moment (MoM) agreed with one calculated by the equivalent circuit. The equivalent circuit expression will provide analytical approach of consideration on power transmission efficiency.