A high-efficiency wireless power transmission circuit using coaxial resonators welded on a substrate

Abstract

In this paper, a high-efficiency wireless power transmission (WPT) circuit for 15.22 MHz based on strongly coupled magnetic resonances is proposed using a new structure of coaxial resonators. The coaxial resonators are manufactured on a substrate. It has the advantages of compactness, ease of fabrication, high efficiency and low cost. The detail structure of the resonators and experimental results are presented. When it is a short-distance application, the efficiency of the circuit can be very high (91.62%) and when the distance increases to 1.5 times of the diameter (18 cm), still there is an efficiency of 52.48%.