Fast and accurate solutions of scattering problems involving dielectric objects with moderate and low contrasts
Author
Ergül, Özgür
Gürel, Levent
Date
2007-08Source Title
2007 Computational Electromagnetics Workshop, CEM'07
Publisher
IEEE
Pages
59 - 64
Language
English
Type
Conference PaperItem Usage Stats
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Show full item recordAbstract
We consider the solution of electromagnetic scattering problems involving relatively large dielectric objects with moderate and low contrasts. Three-dimensional objects are discretized with Rao-Wilton-Glisson functions and the scattering problems are formulated with surface integral equations. The resulting dense matrix equations are solved iteratively by employing the multilevel fast multipole algorithm. We compare the accuracy and efficiency of the results obtained by employing various integral equations for the formulation of the problem. If the problem size is large, we show that a combined formulation, namely, electric-magnetic current combined-field integral equation, provides faster iterative convergence compared to other formulations, when it is accelerated with an efficient block preconditioner. For low-contrast problems, we introduce various stabilization procedures in order to avoid the numerical breakdown encountered in the conventional surface formulations. © 2007 IEEE.
Keywords
AircraftElectromagnetic wave scattering
Electromagnetism
Function evaluation
Iterative methods
Magnetism
Scattering
Solutions
Three dimensional
Breakdown (BD)
Combined field integral equation (CFIE)
Computational electromagnetics (CEM)
Convergence (mathematics)
Dense matrices
Dielectric objects
Electromagnetic scattering problems
In order
Magnetic currents
Multilevel fast multipole algorithm (MLFMA)
preconditioner
Problem sizes
Rao-Wilton-Glisson (RWG) functions
Scattering problem (SP)
Surface formulations
Surface integral equations
Three-dimensional (3-D) objects
Integral equations
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http://hdl.handle.net/11693/27071Published Version (Please cite this version)
http://dx.doi.org/10.1109/CEM.2007.4387652Related items
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