Analysis of Wireless Power Transfer Using Superconducting Metamaterials

A spiral superconducting metamaterial with an effective negative permeability is presented for efficient wireless power transfer (WPT) using magnetic resonant coupling. The S-parameters of superconducting metamaterials unit cell with respect to different resonance frequencies are obtained by the finite element simulation. The effective permeability of the unit cell of superconducting metamaterials is derived by the S-parameter method, and an analysis of the resonant modes is performed by full-wave simulation. The 3 × 3 planar superconducting metamaterials slab is designed by the proposed unit cell to verify their effects in a WPT system. The effects of superconducting on efficiency enhancement are analyzed by both S-parameter and magnetic field distribution simulation. The optimal position of the superconducting metamaterials is acquired by analyzing the transfer efficiency. We show with simulation results that the transfer efficiency of the system can be improved significantly by the superconducting metamaterials through enhanced evanescent wave coupling and with the lower loss properties of the superconductor.