Active, nonlinear, and anisotropic artificial impedance surfaces

Artificial impedance surfaces, a type of planar metamaterial, have the potential to provide new capabilities that are not possible with homogeneous RF materials, and are much more practical than conventional approaches to meta-materials. By adding active electronics, nonlinear devices, and new types of anisotropic patterns, we can enable new capabilities such as superluminal planar waveguides for thin, broadband antennas, nonlinear surfaces for absorbing high power microwave energy, and new practical approaches to cloaking surface features.