Advances in Artificial Impedance Surface Conformal Antennas

Previously we reported on demonstrations of directive radiation from a dipole source located on a flat artificial impedance surface, radiation into the "shadow region" of a cylinder from a dipole feed, and a higher order surface impedance design approach using an iterative procedure. In this work we discuss our recent demonstrations of controlled surface wave radiation with the modulated scalar artificial impedance surface approach. The demonstrations discussed include a waveguide feed tapered modulation impedance surface antenna with 58% aperture efficiency, the redirection of plane waves around solid objects with reradiation at a prescribed angle and the realization of an impedance surface on a structure with two dimensions of curvature. Our other work on the development of tensor artificial impedance surfaces for polarization control is reported separately.