A wideband microwave double-negative metamaterial with non-Foster loading

Although the potential for wideband double-negative metamaterials using non-Foster circuit elements was described more than a decade ago, progress has been somewhat limited. Therefore, the analysis and simulation of a wideband microwave metamaterial are presented, where non-Foster elements are used as loads on split rings and on electric resonators. Using the Faraday law of induction, load conditions are derived for wideband negative permeability of a split ring. Using the Ampere circuital law, load conditions are derived for wideband negative permittivity of an electric resonator comprised of two disks connected by a rod. Simulations and extracted parameters confirm the underlying theory, and a wideband double-negative behavior is observed from 1.0 to 4.5 GHz for the proposed design.