A novel concept for 2-dimensional free-access wireless power transfer system using asymmetric coupling resonators with different sizes

A novel wireless power transfer system which transfers small electric power for handy electronic terminals is proposed. In order to transfer power to handy terminals in a desired region of a room, asymmetric coupling resonators with different sizes are used. This means that a large transmitting coil and a small receiving coil are installed in a transmitter and a receiver, respectively. The possibility of 2-dimensional free-access power transfer is demonstrated by experiments. Design procedure for the system is illustrated and preferable coil structures for Tx coil and Rx coil are discussed. The possible transmission distance and 2-D free-access area are shown. Then, an illustrative system is designed and the performance is confirmed.