Positive/negative refractive index anisotropic 2-D metamaterials

An anisotropic metamaterial, based on a transmission line (TL) approach, that exhibits positive refractive index (PRI) in one direction and negative refractive index (NRI) in another (orthogonal) direction is presented, characterized and demonstrated in terms of analytic dispersion diagrams, equivalent refractive indexes, and circuit-simulated voltage/current/power distributions. This anisotropic structure may also be implemented in distributed architectures and lead to novel antenna and reflector applications.