A combined FEM/MoM approach to analyze the plane wave diffraction by arbitrary gratings

Author

Gedney, Stephen D. ; Lee, Jin Fa ; Mittra, Raj

Author_Institution

Dept. of Electr. Eng., Kentucky Univ., Lexington, KY, USA

Volume

40

Issue

2

fYear

1992

fDate

2/1/1992 12:00:00 AM

Firstpage

363

Lastpage

370

Abstract

The diffraction of TE- and TM-polarized plane waves by planar gratings is numerically analyzed using a combined finite-element-method/method-of-moments (FEM/MoM) algorithm based on the generalized network formulation. The interior region, treated using the FEM, is truncated to a single unit cell with the introduction of an exact periodic boundary condition, which is enforced as a natural boundary condition. Using the FEM to compute the fields within the periodic structure allows gratings of arbitrary cross section and material composition to be efficiently modeled

Keywords

diffraction gratings; electromagnetic wave diffraction; finite element analysis; arbitrary gratings; arbitrary material composition; combined FEM/method-of-moments; exact periodic boundary condition; generalized network formulation; gratings of arbitrary cross section; interior region; natural boundary condition; planar gratings; plane wave diffraction; polarized plane waves; Algorithm design and analysis; Boundary conditions; Conducting materials; Dielectric losses; Dielectric materials; Diffraction gratings; Finite element methods; Magnetic materials; Message-oriented middleware; Slabs;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.120110

Filename

120110