Patent ID: 8174341

Claim:
An apparatus, the apparatus being a metamaterial comprising: a substrate; a plurality of resonators supported on the substrate, each resonator including: a first conducting segment and a second conducting segment; at least one adjustable capacitor located between the first and second conducting segments; and at least one bias capacitor located between the first and second conducting segments; and bias lines configured so as to allow a bias potential to be applied between the first and second conducting segments so as to vary the capacitance of the adjustable capacitor, the plurality of resonators including a column of resonators supported on the substrate, the bias lines including a first bias line electrically connected to first conducting segment of each resonator in the column of resonators, and a second bias line electrically, connected to the second conducting segment of each resonator in the column of resonators, a bias potential applied between the first and second conducting segments adjusting all adjustable capacitors within the column of resonators, the plurality of resonators having bias capacitor values varying with spatial position on the substrate so as to provide a gradient index with no bias potential applied, the apparatus being an electrically tunable metamaterial.