Capacitive discontinuity in cross talk effect

There are a lot of studies that show the effect of coupled lines, but most implementation in MatLab are based on using an n-section lump circuit approximation model, which has a limited bandwidth. Also on every PCB, on a trace it appears a capacitive discontinuity, that influences the coupling of the transmission lines. We propose another approach to describe the coupled lines, and which will be capable to determine the effect of capacitive discontinuity on the coupled lines.