Modeling of microstrip dispersion in FD-TD analysis for HTSC applications

Dispersion in microstrip lines is readily apparent under finite difference-time domain analysis methods. Although the mathematical rigor of such methods provides an accurate representation of system performance for normal conductors, modeling of dispersion-free high temperature superconducting structures requires an appropriate correction to eliminate this effect. A model is proposed whereby the effective substrate permittivity may be adjusted to compensate for the absence of dispersion at higher frequencies.