Metamaterial surfaces for near and far-field applications

This paper summarizes recent advances by the authors in the area of metamaterial surfaces (metasurfaces). It covers periodic and non-periodic metasurfaces for near-field electromagnetic manipulation. In addition, the modeling and development of tensor transmission-line metamaterials and tensor impedance surfaces for the realization of planar transformation electromagnetics devices are reported. Finally, preliminary work on metamaterial Huygens´ surfaces that can steer, beam shape, and focus electromagnetic waves is outlined. These reflectionless surfaces are based on the Surface Equivalence Principle: a rigorous form of the Huygens´ Principle.