Rigorous evaluation of the vertex effects on the frequency-dependent circuit parameters of an open-ended microstrip line

This study presents the original inclusion of right singular vertex conditions in integral equations solved by the method of moments for accurate evaluation of the frequency-dependent microstrip discontinuity models required in microwave integrated circuits (MIC) and monolithic microwave integrated circuits (MMIC) design. The 90° wedges singularity function for the current density, weighted with a novel sampling function for “corner cells,” and the harmonic Green´s function for shielded structures, is accurately and efficiently integrated in the conical geometry of the 90° sector. The frequency-dependent effective length and excess equivalent capacitance of a shielded open-ended microstrip line are calculated to a higher accuracy with respect to previous two-dimensional and three-dimensional “full wave analyses”