Wide-Angle Broadband Metamaterial Lens Based On Double Wire Medium

The double wire medium (DWM) is a 3d metamaterial consisting of two orthogonal sets of metallic wires. These media support two propagating modes in a wide frequency region below the plasma frequency. First mode has hyperbolic isofrequency contour in wires plane, second one has hyperbolic isofrequency contour in the diagonal plane which is orthogonal to wires plane. Both modes can be used to create a planar gathering lens but only the first has been studied before. Our full-wave numerical simulations, ray-tracing simulations and experimental measurements have shown that the lens works efficiently over a wide frequency range with bandwidth of about 60% and for angles of incidence up to 30°. The proposed lens is easy to produce as it has flat interfaces and straight metallic wires hosted in dielectric matrix.