Wireless power transfer via dielectric loaded multi-moded split cavity resonator

摘要

Wireless power transfer via a dielectric loaded multimoded split cavity resonator (SCR) is proposed in this article. Unlike conventional inductive resonant coupling, the scheme enables the control of both the real and imaginary parts of the transfer impedance. It is demonstrated through measurements, analytical models, and extensive full-wave simulation that the inclusion of dielectric resonators (DRs) tuned to the SCR TE012 mode significantly enhances the system figure of merit, optimal efficiency, and maximum power transferred to the load. The effect of the DRs is shown to be related to the resonant coupling of the DR TE01 delta and SCR modes, resulting in an electromagnetic induced transparencylike window. An efficiency of 70% is achieved when the transfer distance is 7 cm or half wavelength. Additionally, it was shown that the efficiency is above 40% over a relatively wide bandwidth and a wide range of optimum load impedance. A circuit model is developed that enables the decomposition of the two port network parameters into their modal contributions. Hence, it allows the comparison with conventional inductive resonant coupling systems on the fundamental level. Additionally, a vector fitting based method is proposed to calculate the circuit parameters from the measured scattering parameters. Published under license by AIP Publishing.