Characterization of wireless power transfer based on Fano resonant-like surface

Abstract

This paper presents a new way to enhance the transmission efficiency of a dual-coils wireless power transfer system. That method is to introduce a Fano resonant-like surface in the dual-coils wireless power transfer system. This surface, positioned opposite the transmission direction of the transmitter coil in the system, adopts a four-armed helical structure. The results demonstrate that introducing the Fano resonant-like surface significantly enhances system transmission efficiency, attributed to two primary factors. First, the Fano local resonance effect in the dual-coils wireless power transfer system with Fano resonant-like surface leads to the enhance the transmission efficiency. Second, the Fano resonant-like surface shields the energy propagation of the nearby magnetic field in the direction opposite to transmission. Further, compared to a wireless power transfer system comprising only two coils, the overall improvement in transmission efficiency is 30%–40%. Owing to its simplicity, more compact size, cost-effectiveness, and ease of integration without having to be placed between the transmitting and receiving coils, the Fano resonant-like surface can lay the groundwork for practical applications in wireless charging.