Tailoring Surface Impedance for Cascaded Cylindrical Metasurfaces

In this paper, we aim to demonstrate a method for designing cascaded azimuthally varying cylindrical metasurfaces, with particular insight into the process of tailoring the surface impedance of unit cells while taking curvature effects into account. We begin with the design requirements specified by S-parameters and present details of a tool for analyzing cascaded cylindrical metasurfaces. This tool also gives us detailed insight into the properties and selection of surface impedance for specific design parameters. Although a common approach is to approximate the surface admittance by its planar counterpart, we analyze this principle and show the limitations of this approximation through a parametric analysis.