Asymmetric Metaconductors Featuring Wideband Skin Effect Suppression

Metaconductors with near-zero permeability is an incentive for the development of high-frequency passive components due to effective suppression of skin effect. In this work, an asymmetric multilayered structure is proposed to broaden the bandwidth of skin effect suppression while preserving a sufficient lower frequency limit of permeability compensation. Coplanar waveguide (CPW) transmission lines consisting of two ferromagnetic layers alternatively stacking with Cu layers were designed and fabricated. Near-zero permeability is obtained at two separated frequencies, which enables broadband eddy current canceling and resistance reduction. The measured results manifest a resistance reduction up to 46% at 11.1 GHz, compared to a Cu transmission line with the same dimensions, and a broad skin effect suppression band between 7.5 and 30.0 GHz, which is sufficient to cover the important 5G applications.