Modeling Cascaded Cylindrical Metasurfaces with Spatially-Varying Impedance Distribution

• Main Authors: Z. Sipus, Z. Eres, D. Barbaric
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2019-09-01
• Series: Radioengineering
• Subjects: Metasurfaces; curved metasurfaces; spectral domain approach; sheet impedance; metasurface production technology; high-frequency conductive materials
• Online Access: https://www.radioeng.cz/fulltexts/2019/19_03_0505_0511.pdf

Modeling curved metasurface structures represents a computing challenge due to the complexity of considered designs. This creates a need for specialized efficient analysis methods. An approach that combines the spectral-domain field representation and surface sheet impedance concept is proposed. The considered cascaded cylindrical metasurface structures can span across only a part of a canonical surface and unit cell elements can vary along the metasurface, giving a spatially-varying sheet impedance. The analysis method is experimentally verified against a cylindrical metasurface for shaping the feed antenna beam. The problem of manufacturing curved metasurfaces is also discussed in the paper.