Antenna Possibilities using 2D Planar Periodic Structures

We discuss possibilities that exist when a 2-D array of wires loaded with linear lumped or with non-linear lumped elements are deployed as passive or as semi-active frequency selective surfaces. We show that such surfaces can act as an EM shutter which allows the flow of transmitted energy to be controlled. In addition it is demonstrated that the inclusion of nonlinear components allow surfaces to be made which could behave as thin planar lenses or as phase conjugating artificial media. Further, the paper discusses the anisotropic propagation properties of textured surface PCBs as means for antenna far-field radiation control