DocumentCode :
781428
Title :
Combining an extrapolation technique with the method of moments for solving large scattering problems involving bodies of revolution
Author :
Altman, Zwi ; Mittra, Raj
Author_Institution :
Electromagn. Commun. Lab., Illinois Univ., Urbana, IL, USA
Volume :
44
Issue :
4
fYear :
1996
fDate :
4/1/1996 12:00:00 AM
Firstpage :
548
Lastpage :
553
Abstract :
The purpose of this work is to combine an extrapolation technique with the method of moments (MoM) to solve scattering problems involving large bodies. It has been shown in a previous work that the current induced on the smooth parts of large scatterers may be represented as a series of complex exponential functions with a few terms. Based on this concept, a hybrid set of basis functions is constructed using entire domain functions of complex exponential type on the smooth portion of the scatterer, complemented by subdomain basis functions near edges and discontinuities. An extrapolation procedure is developed in which the scattering problem is first solved for a portion of the scatterer using the conventional MoM. Next, a set of entire-domain basis functions, whose behaviour could be extrapolated with an increase in the size of the scatterer, is extracted from this original solution. The procedure outlined has the very desirable feature that the total number of basis functions remains unchanged even as the scatterer size is increased, allowing for large scatterers to be handled with a relatively small number of unknowns. The extrapolation technique is applied to scattering problems from bodies of revolution (BORs), and numerical results for an open cylinder and a barrel-shaped BOR are presented
Keywords :
electric current; electromagnetic induction; electromagnetic wave scattering; extrapolation; functions; method of moments; MoM; barrel-shaped BOR; bodies of revolution; complex exponential functions; discontinuities; edges; entire domain functions; extrapolation; hybrid basis functions; induced current; large scattering problems; method of moments; numerical results; open cylinder; scatterer size; subdomain basis functions; Acceleration; Current distribution; Electromagnetic scattering; Equations; Extrapolation; Finite element methods; Iterative methods; Message-oriented middleware; Moment methods; Sparse matrices;
fLanguage :
English
Journal_Title :
Antennas and Propagation, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-926X
Type :
jour
DOI :
10.1109/8.489307
Filename :
489307
Link To Document :
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