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The design and performance of an isotropic negative-refractive-index metamaterial lens

In this paper, a three-dimensional, fully-isotropic, broadband negative-refractive-index (NRI) medium is proposed. The structure has a NRI bandwidth of 23.5% and a simulated loss of 0.063dB/cell at the operating frequency of 1.51GHz (where μr ≈ −1). The metamaterial is used to realize a NRI lens, the fabrication of which is described in detail. Analytical methods are used to predict the focusing capabilities of this lens at different frequencies based on the material parameters obtained from full-wave simulations.