Title :
A spatial filter-enabled high-resolution subgridding scheme for stable FDTD modeling of multiscale geometries
Author :
Chang, Chun ; Sarris, Costas D.
Author_Institution :
Edward S. Rogers Sr. Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
Abstract :
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, within the context of the FDTD technique, based on a spatial filtering method that enables dense and coarse grids to be run at the time-step of the coarse grid. A spatial filter, coupled to the FDTD update equations, stabilizes those subgrids that are simulated at time steps above their stability limit. The proposed method is used to implement very high aspect ratio subgrids, maintaining late-time stability over millions of time steps.
Keywords :
finite difference time-domain analysis; spatial filters; FDTD update equations; coarse grid time-step; dense grids; multiscale geometry stable FDTD modelling; real-life microwave structures; spatial filter-enabled high-resolution subgridding scheme; Finite difference methods; Time domain analysis; FDTD methods; digital filters; numerical stability;
Conference_Titel :
Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-61284-754-2
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2011.5972916