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access icon free Modelling cascaded cylindrical metasurfaces using sheet impedances and a transmission matrix formulation

© The Institution of Engineering and Technology
Received 14/06/2017, Accepted 26/12/2017, Revised 15/12/2017, Published 04/01/2018

Metasurfaces that manipulate electromagnetic waves have gained significant attention in recent years. The focus has primarily been on planar devices, while many applications require curved surfaces. In this study, the authors propose an analysis approach for cylindrical cascaded (multilayer) metasurfaces. The approach combines the concept of sheet impedance in the spectral domain with a new transmission matrix formulation that is applicable to stratified, canonical curved geometries. Approximate formulas for the sheet impedance of common planar, metallic patterns are also adapted to curved geometries. The reported analysis approach allows one to determine the optimal spectral-domain, azimuthal dependence of a sheet impedance, as well as the best geometrical elements to obtain the required azimuthal variation. The results are verified through several cylindrical metsurface examples.

Inspec keywords: matrix algebra; electromagnetic metamaterials

Other keywords: azimuthal dependence; cascaded cylindrical metasurfaces; sheet impedances; optimal spectral-domain; transmission matrix formulation; electromagnetic waves

Subjects: Artificial electromagnetic wave materials and structures; Algebra

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