Quasi-uniform magnetic field generated by multiple transmitters of magnetically-coupled resonant wireless power transfer

Magnetically-coupled resonant wireless power transfer (MCR-WPT) has been a research focus in recent years. Multiple transmitters are employed to improve efficiency in a wide area. In this paper, the MCR-WPT system with two transmitters supplied by the same source is modeled and its equivalent circuit is depicted. The mutual inductance between the two transmitters is considered. Proper connection of the transmitters results in the enhancement of the magnetic field in certain areas. Based on the circuit theory, the explicit expression of the efficiency is derived. The quasi-uniform magnetic field and roughly equal efficiency are analyzed.