Full Wave Analysis for S-Parameter Calculation of Arbitrary Three-Dimensional Lossy Structures

A three dimensional complex finite difference method treatment of transmission line discontinuity problems is presented. The generalized scattering parameters can be computed for any arbitrary one port or two port structure. Dielectric and conductor losses are taken into account for the first time. The full wave analysis accounts for losses, higher order modes, and all substrat effects. The general formulation and the procedure of the method are described. Results for a gap in a coplanar transmission line, a microstrip parallel resonator and a MMIC planar resistor are presented for the lossy and non lossy case.