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Article: New approximate formulations for EM scattering by dielectric objects

TitleNew approximate formulations for EM scattering by dielectric objects
Authors
KeywordsBorn Approximation
Buried Dielectric Objects
Conjugate-Gradient Fast Fourier Transform (Cg-Fft) Algorithm
Extended Born (Exborn) Approximation
High-Order Approximations
Low-Frequency Detection
Issue Date2004
Citation
Ieee Transactions On Antennas And Propagation, 2004, v. 52 n. 3, p. 684-692 How to Cite?
AbstractThe extended Born approximation (ExBorn) has been shown an efficient formulation in the electromagnetic (EM) scattering by dielectric objects in both free-space and air-earth half-space problems. In most cases, ExBorn is much more accurate than the conventional Born approximation at low frequencies. When the frequency is high or the contrast of dielectric objects is large, however, the ExBorn approximation becomes inaccurate. In this paper, new approximations are proposed for the EM scattering by dielectric objects buried in a lossy earth, which are also suitable for the case of free space. It has been shown that the zeroth-order form of new approximations is completely equivalent to ExBorn. Hence, high-order approximations can be regarded as high-order ExBorn. Closed-form formulations are derived for the new approximations. Using the fast Fourier transform (FFT), these formulations can be implemented efficiently at a cost of CN log N, where N is the number of unknowns and C is a small number. Numerical simulations show that high-order ExBorn approximations are much more accurate than the ExBorn approximation.
Persistent Identifierhttp://hdl.handle.net/10722/182713
ISSN
2015 Impact Factor: 2.053
2015 SCImago Journal Rankings: 2.130
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCui, TJen_US
dc.contributor.authorChew, WCen_US
dc.contributor.authorHong, Wen_US
dc.date.accessioned2013-05-02T05:16:33Z-
dc.date.available2013-05-02T05:16:33Z-
dc.date.issued2004en_US
dc.identifier.citationIeee Transactions On Antennas And Propagation, 2004, v. 52 n. 3, p. 684-692en_US
dc.identifier.issn0018-926Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/182713-
dc.description.abstractThe extended Born approximation (ExBorn) has been shown an efficient formulation in the electromagnetic (EM) scattering by dielectric objects in both free-space and air-earth half-space problems. In most cases, ExBorn is much more accurate than the conventional Born approximation at low frequencies. When the frequency is high or the contrast of dielectric objects is large, however, the ExBorn approximation becomes inaccurate. In this paper, new approximations are proposed for the EM scattering by dielectric objects buried in a lossy earth, which are also suitable for the case of free space. It has been shown that the zeroth-order form of new approximations is completely equivalent to ExBorn. Hence, high-order approximations can be regarded as high-order ExBorn. Closed-form formulations are derived for the new approximations. Using the fast Fourier transform (FFT), these formulations can be implemented efficiently at a cost of CN log N, where N is the number of unknowns and C is a small number. Numerical simulations show that high-order ExBorn approximations are much more accurate than the ExBorn approximation.en_US
dc.languageengen_US
dc.relation.ispartofIEEE Transactions on Antennas and Propagationen_US
dc.subjectBorn Approximationen_US
dc.subjectBuried Dielectric Objectsen_US
dc.subjectConjugate-Gradient Fast Fourier Transform (Cg-Fft) Algorithmen_US
dc.subjectExtended Born (Exborn) Approximationen_US
dc.subjectHigh-Order Approximationsen_US
dc.subjectLow-Frequency Detectionen_US
dc.titleNew approximate formulations for EM scattering by dielectric objectsen_US
dc.typeArticleen_US
dc.identifier.emailChew, WC: wcchew@hku.hken_US
dc.identifier.authorityChew, WC=rp00656en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1109/TAP.2004.825159en_US
dc.identifier.scopuseid_2-s2.0-2442534899en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-2442534899&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume52en_US
dc.identifier.issue3en_US
dc.identifier.spage684en_US
dc.identifier.epage692en_US
dc.identifier.isiWOS:000220944700005-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridCui, TJ=7103095470en_US
dc.identifier.scopusauthoridChew, WC=36014436300en_US
dc.identifier.scopusauthoridHong, W=36077687100en_US

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