A Stable FDTD Subgridding Method Based on Finite Element Formulation With Hanging Variables

Author

Venkatarayalu, Neelakantam V. ; Lee, Robert ; Gan, Yeow-Beng ; Li, Le-Wei

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore

Volume

55

Issue

3

fYear

2007

fDate

3/1/2007 12:00:00 AM

Firstpage

907

Lastpage

915

Abstract

The finite-element time-domain (FETD) method based on the use of hanging variables to generate nested grids is used as an interface between the coarse and fine grids in the FDTD subgridding method. Since the formulation for treating hanging variables is based on a Galerkin-type intergrid boundary operator, the resulting FDTD subgridding algorithm is guaranteed to be stable. Numerical examples such as the computation of resonant modes of a 3-D rectangular resonant cavity and 2-D TE_z scattering by a PEC cylinder and a NACA airfoil are presented to verify the stability and accuracy of the proposed subgridding algorithm

Keywords

Galerkin method; finite difference time-domain analysis; finite element analysis; numerical stability; FDTD subgridding method; FETD; Galerkin-type intergrid boundary operator; finite difference time-domain; finite-element time-domain method; hanging variable; stability; Automotive components; Electromagnetic scattering; Finite difference methods; Finite element methods; Gallium nitride; Laboratories; Mesh generation; Resonance; Stability; Time domain analysis; Finite-element time-domain method (FETD); finite-difference time-domain (FDTD) method; hanging variables; stability analysis;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2007.891809

Filename

4120299