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A controllable negative refraction device operated between 7 and 16 GHz is presented. This compact device, which is composed of split-ring resonators and metallic wires including pin diodes, presents a controllable permittivity and a fixed permeability. The switching of the electromagnetic state is demonstrated from transmission measurements between 7 and 16 GHz. The negative refraction of the material is verified from measurements at oblique incidence.
Date of Publication: 16 Feb. 2006