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a combined finite element-boundary integral formulation for solution of two-dimensional scattering problems via cgfftA new technique is presented for computing the scattering by 2-D structures of arbitrary composition. The proposed solution approach combines the usual finite element method with the boundary-integral equation to formulate a discrete system. This is subsequently solved via the conjugate gradient (CG) algorithm. A particular characteristic of the method is the use of rectangular boundaries to enclose the scatterer. Several of the resulting boundary integrals are therefore convolutions and may be evaluated via the fast Fourier transform (FFT) in the implementation of the CG algorithm. The solution approach offers the principal advantage of having O(N) memory demand and employs a 1-D FFT versus a 2-D FFT as required with a traditional implementation of the CGFFT algorithm. The speed of the proposed solution method is compared with that of the traditional CGFFT algorithm, and results for rectangular bodies are given and shown to be in excellent agreement with the moment method.
Document ID
19910035240
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Collins, Jeffery D.
(Michigan Univ. Ann Arbor, MI, United States)
Volakis, John L.
(Michigan Univ. Ann Arbor, MI, United States)
Jin, Jian-Ming
(Michigan, University Ann Arbor, United States)
Date Acquired
August 15, 2013
Publication Date
November 1, 1990
Publication Information
Publication: IEEE Transactions on Antennas and Propagation
Volume: 38
ISSN: 0018-926X
Subject Category
NUMERICAL ANALYSIS
Funding Number(s)
CONTRACT_GRANT: NAG2-541
Distribution Limits
Public
Copyright
Other