Resonant Frequency Calculation of Witricity Using Equivalent Circuit Model Combined with Finite Element Method

Wireless power transfer, known as witricity, has become a topical issue for academicians and engineers alike since the pioneering work of a Massachusetts Institute of Technology (MIT) research group based on the well-known principle that the electromagnetic coupling of two systems with the same resonant frequency is strongest. This paper presents a model and method to calculate the resonant frequency of planar spirals for wireless power transfers based on equivalent circuit model and three-dimensional finite element analysis. The numerical results on a prototype resonator as reported validate the feasibility and advantages of the proposed approach.