The capacitive power transfer (CPT) system is a promising mid-range wireless charging approach. It has grown in popularity due to its inherent advantages over inductive power transfer (IPT) systems, such as higher misalignment tolerance, and being lighter. The low coupling capacitance (often in the picofarad (pF) zone) between the transmitter and receiver plates is the underlying problem with CPT; therefore, it is not suitable for high-power, larger air-gap applications. In this paper, a new capacitive-based coupler is created by vertically stacking four plates for wireless charging applications. In this structure, the exterior plates of this construction have a rectangle shaped for improved misalignment tolerance and better shielding. Inner plates have a hexagonal form to transfer more power with less emission of electric fields. The performance is evaluated in terms of electric field emissions and misalignment tolerance, through ANSYS-Maxwell simulation to show the efficacy of the proposed coupler.
