二维电磁场有限元分析

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1、IEEETRANSACTIOKSONANTEKNASANDPKOPAGATION.VOL.37.NO.5.MAY1989601AFrequency-DomainDifferentialEquationFormulationforElectromagneticScatteringfromInhomogeneous-CylindersAbstract-Aprocedureisdescribedforcalculatingscatteringcross-Isectiondatabasedonthenumericalsolutionofdifferentialequati

2、onsinthefrequencydomain.Thescatterersconsideredaretwodimensionalandconsistoflossy,inhomogeneousdielectric,magnetic,andperfectlyconductingmaterial.Theappropriatewaveequationiscombinedwithanapproximatelocalabsorbingboundaryconditionanddiscretizedwiththefiniteelementmethod.Resultsforcond

3、uctinganddielectricscatterersarepresentedtoillustratetheaccuracyandgeneralityoftheapproach.I.INTRODUCTIONINCONTRASTWITHthenumerousformulationsavailableintheliteraturefortheanalysisofperfectconductingorhomogeneouselectromagneticscatterers,relativelyfewtech-niqueshavebeendevelopedforthe

4、treatmentofhighlyinhomogeneousbodies.Severalvolumeintegralequation(VIE)formulationshavebeendevelopedfortherigorousanalysisofinhomogeneousdielectricbodies[11-[6].Scatter-erscontainingmagneticmaterialscanbeanalyzedusingxintegralequationsthataretheelectromagneticdualtothoseemployedfordie

5、lectricbodies.AllintegralequationmethodsFig.1.Crosssectionofthecylindricalgeometryunderconsiderationrequirethesolutionofafullypopulatedmatrixequation.Unfortunately,thenecessarystoragemaybeprohibitiveforboundaryconditionapplieddirectlyinthenearzoneofthemanyproblemsofinterest.scatterer[

6、16],[171.AdescriptionofthistechniqueisprovidedAnalternativeformulationinvolvesthediscretizationofbelow.Arecentvariationonthelatterapproachinvolvesdifferentialequationsthroughoutthevolumeoftheinhomoge-transformingtheHelmholtzwaveequationintoanalternateneousscatterer[7]-[191.Theseequati

7、onsareconvenienttodifferentialequation[181.Suchaproceduremaysimplifytheemploywithincomplexinhomogeneousregions,andcandiscretizationprocessaswellastheselectionofanaccurateeasilyincorporateconductingboundaries.Inaddition,differ-absorbingboundarycondition.entialequationsdiscretizetoprodu

8、cespa