Negative and Near-Zero Permeability Metamaterials for Efficiency Improvement in Wireless Power Transfer System

The wireless power transfer (WPT) system for unmanned aerial vehicles is limited by the charging distance. To improve the conversion efficiency of this WPT system, the hybrid metamaterial slabs with both negative and near-zero permeability are proposed. Two hybrid metamaterial slabs are positioned: one behind the Tx and Rx coils and the other between them. This paper verifies that the hybrid metamaterial slabs that have been proposed can improve the efficiency of the WPT system, around 13%.