A Finite Element-Boundary Integral Formulation for Scattering by Threedimensional Cavity-Backed Apertures

Jian Ming Jin, John L. Volakis

Research output: Contribution to journalArticlepeer-review

Abstract

A new numerical technique is proposed for the electromagnetic characterization of the scattering by a threedimensional (3-D) cavity-backed aperture in an infinite ground plane. The technique combines the finite element and boundary integral methods to formulate a system of equations for the solution of the aperture fields and those inside the cavity. Specifically, the finite element method is employed to formulate the fields in the cavity region, and the boundary integral approach is used in conjunction with the equivalence principle to represent the fields above the ground plane. Unlike traditional approaches, the proposed technique does not require a knowledge of the cavity's Green's function and is, therefore, applicable to arbitrary shape depressions and material fillings. Furthermore, the proposed formulation leads to a system having a partly full and partly sparse as well as symmetric and banded matrix which can be solved efficiently using special algorithms.

Original languageEnglish (US)
Pages (from-to)97-104
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Volume39
Issue number1
DOIs
StatePublished - Jan 1991
Externally publishedYes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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