Curvature Modeling in Design of Circumferentially Modulated Cylindrical Metasurface LWA

This letter presents an analytical model to predict the behavior of a circumferentially impedance modulated cylindrical metasurface leaky-wave antenna. The variation in the radiation characteristics of the leaky-wave antenna with respect to its curvature is addressed. A lossy transmission line, whose loss is associated with the curvature of the metasurface, is utilized to determine the surface impedance of the metallic strips placed on a dielectric covered ground plane. This modifies the propagation constant of the surface wave propagating along the circumferential interface. As the surface wave is the source of radiation from the metasurface, any variation in the propagation constant of the surface wave changes the radiation characteristics of the leaky-wave structure.