Circular Split Ring Meta-Surfaces Variation Study as Surface Wave Suppressor

This work focuses on three different edge variation modified on the same circular split ring (CSR) longest arm of metallo dielectric periodic structure and its corresponding electromagnetic bandgap (EBG) behaviour as an alternative step to suppress surface wave. Three variants of circular split ring were studied to fulfill the requirements: Normal edge, triangular tip and tapered tip. These structures were optimized using Eigenmode Solver (EmS) with Advanced Krylov Subspace (AKS) method for full wave dispersion diagram. Final results shows a stable and good EBG region achieved from this CSR specifically within the 5.9 to 6 GHz region. The normal tip CSR that has a stable and good bandgap exits from 5.9265 GHz to 5.9516 GHz in between mode 5 and 6. While the triangular tip CSR bandgap is from 6.0214 GHz to 6.0378 GHz and tapered tip is from 6.0214 GHz to 6.0378 GHz.