Consideration of use of arrayed transmitting coils in wireless power transfer with magnetically coupled resonance

Recently, the research and development on wireless power transfer(WPT) attracts our attention because the WPT system enables us to charge cellular phones, notebook computers and electrical vehicles wirelessly [1]. One of the problems in the WPT with magnetically coupled resonance is a decrease in transmitting efficiency due to a misalignment of the receiving coil to the transmitting coil. Unfortunately, this problem is supposed to become more serious because of the miniaturization of electronic equipments [2] [3].