Design of coupled resonators for wireless power transfer to mobile devices using magnetic field shaping

In this paper, we designed the magnetically coupled resonators for wireless power transfer to mobile devices using field shaping technique. Power transfer to mobile devices is normally sensitive to variation of distance and alignment between transmitters and receivers. The magnetic field shaping technique, which is applied by On-line Electric Vehicle (OLEV) system, is considered to compensate the sensitivity, to reduce electromagnetic fields (EMF) around the receivers, and also to improve efficiency of power transfer [1]. We developed miniaturized coupled resonators to cover mobile devices, and enhanced coupling effect with modified formation of coupled resonators. Also, the coupled resonators are designed to receive power stably, less sensitive to variation of distance and alignment. We present measurement results with s-parameter value of the amount of power transferred.