Full-wave Mode Analysis of Asymmetric Coupled Microstrip Structures: Particular Case of Quasi-symmetric Lines

摘要

The aim of this paper consists to highlight in which case asymmetric coupled microstrip structures can be studied by symmetric line model in order to use the quasi-symmetric approach. For this purpose, a rigorous formulation was developed; trial functions of C and π modes were obtained from the quasi-symmetric case, and thus proposed for the asymmetric case. A comparative study of dispersion parameters demonstrated the limits of the quasi-symmetric model validity with respect to asymmetries due to influence of shielding and metal strips widths difference.