Modal domain analysis of asymmetric coupled planar structures: The quasi symmetric model

The objective of this paper is to demonstrate in which case asymmetric coupled structures can be analyzed as symmetric line models in order to use the quasi-symmetric approach. For this aim, a rigorous formulation was used; trial functions of even and odd modes were obtained from the symmetric case, and thus proposed for the asymmetric case. A comparative study of dispersion parameters shows the limits of the quasi-symmetric model validity with respect to asymmetries due to influence of shielding and metal strips/or slots widths difference.