Model Order Reduction for Problems With Dispersive Surface Boundary Conditions

This letter proposes a new scheme for reduced-order finite-element modeling of electromagnetic structures with nonlinear, dispersive surface boundary conditions, which optimally exploits the numerically stable and efficient MOR framework for second-order systems provided by SAPOR method. The presented results of numerical experiments for an example of a waveguide filter demonstrate the superior accuracy of the resulting reduced models both locally, around the expansion point, and over a wide frequency band, as compared to other commonly used methods for approximating the dispersive boundary conditions.