Adequate choice of trial functions used in integral method for modeling asymmetric coupled mirostrip structures

The purpose of this paper is the establishment of the adequate choice of trial functions used in the transverse resonance method for modeling asymmetric coupled microstrip structures for C- and pi-mode in full-wave domain. So, two kinds of the set of cosine trial functions are used (one takes into account the edge metallic effects and other does not take any) in order to study convergence behavior of dispersion parameters with respect to the required precision. The electromagnetism operator formalism is applied to efficiently study the dispersion effect of coupled microstrip structures. Comparisons with published data are presented in order to confirm the best choice of the set of trial functions used in this method.