Magnetic field forming of spatial multiple antennas for wireless power transfer

In this paper, the design and the optimization of WPT system are described. The focus of this paper is designing a 2D structure of the transmitter and the receiver. Simulation results show significant advantages of multiple coils structures in the efficiency. The four coils transmitter model provides larger range, which can obtain higher power efficiency, comparing to the single coil model. When using the four coils model within a 600 mm x 600 mm transmitting area, placed 200 mm away and no phase shift input signal, the power transfer efficiency is over 80% for 370 KHz. The results confirm the robustness of the multiple coils model based WPT system when operating at longer transmitting distances, which also demonstrate that multiple coils model is of advantage to solve the field forming problem.