부산대학교 도서관

In this paper, a design method for obliquely excited artificial gradient-index lenses based on a single-layer fishnet metamaterial is presented. The proposed unit cell design for operation at 60 GHz covers transmission phase values between -180° and +180° at nearly constant magnitude by variation of the geometry parameters. In order to predict the behavior of a specific unit cell geometry under oblique incidence, a model-based approach, accounting for anisotropy and spatial dispersion, was developed. To verify the new method, a lens for collimating a strongly curved wavefront is designed. This lens is compared with a design based on the conventional phase compensation approach in terms of simulation and measurement results.