Experimental characterization of volume-mode waves in near-field anisotropic metamaterials with application to wireless power transfer

In this work we characterize the magnetoquasistatic waves in an anisotropic, indefinite metamaterial used in wireless power applications. We show that the magnetic resonances in the metamaterial are volume mode waves and calculate the expected complex wave number, which represents the wavelength and attenuation, versus frequency from the complex permeability of the metamaterial. We then compare the calculated wavenumber to an experimentally extracted number. Our results show that the loss of the metamaterial increases with frequency due to the shortening of the wavelength even though the imaginary part of μ̂ is lower at these frequencies.