Improved formulation of the singular integral equation method for multilayer unilateral finlines

Rigorous analysis of discontinuities in planar transmission lines such as finlines may require accurate computation of a large number of modes. Currently available numerical techniques are generally not suitable for this purpose. An improved formulation of the singular integral equation (SIE) method for multilayer unilateral finlines is presented to address this problem. The developed numerical techniques lead to an accurate, efficient, and reliable computation of both propagation constants and field distributions for a large number of modes.