Exploration of A New Metamaterial for A “Qi”-Compatible Wireless Power Transfer System

This paper presents a novel design of a metamaterial unit cell that is optimized for low-frequency Qi-compatible Wireless Power Transfer (WPT) systems. The proposed unit cell undergoes a thorough electromagnetic simulation and Finite Element Analysis (FEA) using ANSYS High-Frequency Structure Simulator (HFSS). The paper also includes a numerical analysis of key factors such as wire length, inter-turn spacing, and compensation capacitor, which contribute to the reduction of resonance frequency. The MTM unit cell model is further designed and simulated in ANSYS HFSS to extract the transmission coefficient and reflection coefficient, which indicate the resonance behavior, and obtain the permittivity and permeability using S-parameter retrieval. Ultimately, the metamaterial unit cell produces negative permeability and permittivity at a resonant frequency of 100kHz, making it a suitable choice for Qi-compatible wireless power transfer systems.