Low-frequency metamaterial permeability retrieval for near-field applications

Existing methods for permeability measurement of metamaterials have been limited to far-field applications, where the fields interacting with the metamaterial are plane waves. In near-field applications, such as wireless power transfer, the previous plane-wave approach is not viable. In this work, we present a simple and accurate method for extracting the complex permeability of a near-field metamaterial.