電磁散射特性分析的無網(wǎng)格法研究.pdf

1、西安電子科技大學碩士學位論文電磁散射特性分析的無網(wǎng)格法研究姓名：劉江濤申請學位級別：碩士專業(yè)：無線電物理指導教師：張民20080101AbstractThetraditionalnumericalmethodfortheproblemsofelectromagneticscatteringfEM)isbasedonthemeshseh自tlle，botha11nod髂andfacetsareneededforthesolverWitht

2、hemoreelaboratemeshschemeandmoreBnknownareneededthesolverisoftenslowandevcnworldessSointhisdissertationameshlessmethod(MLM)intelllISofthemethodoffundamentalsolutions(MFS)isextendedtostudyeffectivelyandaccuratelyforthepro

3、blemsofelectromagneticscatteringandradiationtobreakthebottleneckofmeshschemeThebasictheoryofMFSisdiSCRSScdfirstlyinthisthesisandthecomparabilitywilhconventionalintegralequationmethodsisalsogivenThealgorithmmentionedherei

4、sbasedOnthefundamentalsolutionsofthewaveequation，andthelinearcombinationofthesesolutionscanbeusedtodescribetheEMfieldsneededForthetwodimensionalEMscatteringproblems，thefieldstobesolvedforcanbeexpresseddirectlyintermsoffu

5、ndamentalsolutionsofappropriatewaveequations，throughenforcingtheboundaryconditionsatthecollocatedpoints，amatrixequationisfoundedaftertheunknowncoefficientsisobtainedtheproblemissettleddownInthissectionwestudytheEMscatter

6、ingfromthemetalobjectsandthedielectricobjects，aswellasthemetalobjectscoated誦thdielectricmaterialsthentheaflOrSofresultsisanalyzedparticularlyForthreedimensionalproblems，thepairsofcurrentelementswhichareperpendiculartoeac

7、hotherandtangentialtotheauxiliarysurfacearerequiredtodescribethevectorfieldfunctionseompletelyWiththeunderstandingtheEMscatteringcharacteristiCSfromthemetalldielectricbodiesarestudiedindetailtheauxiliaryparameterswhichin

8、fluencetheprecisionoftheresults，andtheefficiencyofMFSinthepresenceof黜discussedcarefullyFinallytheMFSisappliedtostudyelectromagneticscatteringfromtherandomroughsurfaces，aswellasthetargetaboveroughsurfaceAusefulapproachusi