COMPARISON BETWEEN 2 SETS OF BASIS FUNCTIONS FOR THE CURRENT MODELINGIN THE GALERKIN SPECTRAL-DOMAIN SOLUTION FOR MICROSTRIPS

A frequently used technique for the numerical full wave analysis of pl anar microwave passive structures is the method of moments (MoM). A ve ry important determinant for the accuracy and efficiency of this techn ique is the choice of the basis functions used in the approximation of the unknown current components. The application of several types of e ntire and subsectional domain basis functions has been proposed in the literature. However, little comparison has been made between differen t types of basis functions. In this paper, a comparison is presented b etween two sets of frequently used subsectional domain basis functions for the canonical case of the microstrip transmission line. The empha sis in this paper is on the relative accuracy, the convergence and the computational efficiency or both sets of basis functions. The intent of the paper is primarily to be an eye opener for the implications of the choice of the basis functions.