TRIANGULAR AND RECTANGULAR ELEMENTS IN THE SPECTRAL-DOMAIN ANALYSIS OF ARBITRARILY-SHAPED PLANAR CIRCUITS

An existing approach for the spectral-domain analysis of planar circui ts in layered media based on piecewise-sinusoidal current expansion fu nctions over rectangular elements which are located parallel or perpen dicular to each other is expanded to a wider class of geometric shapes . In a first step the rectangular cells are allowed to be arbitrarily directed in the plane of the circuit. In a second step triangular elem ents are used to combine arbitrary rectangular cells. Two kinds of cur rent expansion functions with different computational effort are appli ed to the triangular and its two adjacent rectangular elements. Numeri cal results are presented.