A spatial filter-enabled high-resolution subgridding scheme for stable FDTD modeling of multiscale geometries

Summary form only given, as follows. As many real-life microwave structures include multiple space and time scales, research on stable subgridding schemes is as timely as ever. This paper presents a new approach to this old problem, based on a spatial filtering method that enables dense and coarse grids to be run at the timestep of the coarse grid. A spatial filter is used to stabilize very high aspect ratio subgrids, maintaining late-time stability over millions of time steps.