Design of Cascaded Cylindrical Metasurfaces Using Resonance Cancellation Method

Design of curved metasurfaces is often a challenging task and requires the use of specialized analysis tools and methods. In this letter, we discuss a modification of the mode matching technique used for analyzing planar metasurfaces in order to efficiently apply it to the analysis of cylindrical structures. The first step in our procedure is to determine the optimal surface admittance of each curved metasurface unit cell for which the curvature effects are taken into account. Further, we introduce the resonance cancellation method to remove internal resonances that occur in closed canonical structures. This consequently allows us to extend the applicability of this approach to the analysis of inhomogeneous metasurface structures that occupy only a part of the curved surface. The developed analysis and design method is evaluated through comparison with reference designs based on circular–cylindrical metasurface examples demonstrating both completely cylindrical homogeneous and semicylindrical inhomogeneous cases.