A Novel Preconditioning Technique and Comparison of Three Formulations for Hybrid FEM/MoM Methods

Abstract

Hybrid FEM/MoM methods combine the finite element method (FEM) and the method of moments (MoM) to model inhomogeneous unbounded problems. These two methods are coupled by enforcing field continuity on the boundary that separates the FEM and MoM regions. There are three ways of formulating hybrid FEM/MoM methods: outward-looking formulations, inward-looking formulations and combined formulations. In this paper, the three formulations are compared in terms of computer-resource requirements and stability for four sample problem geometries. A novel preconditioning technique is developed for the outward-looking formulation. This technique greatly improves the convergence rate of iterative solvers for the types of problems investigated in this study.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

EMC; FEM; MoM; Iterative Solvers; Permutation; Preconditioning; Sparse Matrix

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2000 Applied Computational Electromagnetics Society (ACES), All rights reserved.

Publication Date

01 Jan 2000

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