Analysis of cloaking metasurface using theory of characteristic modes

Abstract

Metasurfaces are used to design mantle cloaks based on scattering cancellation which involves surface impedance analysis. Theory of characteristic modes is a good tool for analyzing the scattering of a metallic object because it is based on the surface impedance and brings physical insight into the scattering properties of a structure independently of an excitation source. The theory of characteristic modes is applied in the analysis of a cylindrical cloaking metasurface used for a UMTS antenna. The result provides physical insight into the design of mantle cloaks. It shows that the direction of the fundamental modal current distribution of the cloak is at 90 • to that of the UMTS antenna.