Design of Non-fixed frequency Metamaterial and Its Application in Wireless Charging System

The charging efficiency and electromagnetic radiation of wireless charging system of electric vehicle limit its popularization. This paper studies the design method of non-fixed frequency metamaterial in kHz frequency band, and analyzes the influences of parameters of metamaterial unit and the metamaterial array on the equivalent impedance and coupling characteristics of electric vehicle wireless charging. The resonance characteristics of metamaterial array under the influence of harmonics are explored. The experimental model of metamaterial is made to prove the obviously increase of the equivalent permeability when approaching the resonant frequency. The field-circuit coupling transient field simulation of wireless charging system is built to verify the feasibility and efficiency of wireless charging technology based on non-fixed frequency metamaterial.