Application of stable FEM-FDTD hybrid to scattering problems

Author

Rylander, Thomas ; Bondeson, Anders

Author_Institution

Dept. of Electromagn., Chalmers Univ. of Technol., Goteborg, Sweden

Volume

50

Issue

2

fYear

2002

fDate

2/1/2002 12:00:00 AM

Firstpage

141

Lastpage

144

Abstract

A recently developed, stable, finite-element method (FEM), finite-difference time-domain (FDTD) hybrid that eliminates the staircase approximation of complex geometries is tested by convergence studies for radar cross-sections. For a conducting sphere, 1 dB accuracy in all directions is obtained with nine cells per wavelength, whereas the NASA almond requires a higher resolution of about 15 cells per wavelength. For scatterers with a smooth boundary, the results converge quadratically with the mesh size, but for a horizontally polarized wave incident on the NASA almond, the order of convergence is lower because of singular fields at the tip

Keywords

conducting bodies; convergence of numerical methods; electromagnetic wave scattering; finite difference time-domain analysis; finite element analysis; radar cross-sections; FEM-FDTD hybrid; NASA almond; conducting sphere; electromagnetics modeling; finite-difference time-domain analysis; finite-element method; mesh size; radar cross-sections; scattering problems; smooth boundary scatterers; staircase approximation; Convergence; Finite difference methods; Finite element methods; Geometry; NASA; Polarization; Radar cross section; Radar scattering; Testing; Time domain analysis;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/8.997982

Filename

997982