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1、导体球涂覆各向异性铁氧体介质电磁散射的解析解耿友林①吴信宝②官伯然①①(杭州电子科技大学天线与微波研究所杭州310018)②(上海微波技术研究所上海200063)摘要该文用球矢量波函数对各向异性铁氧体介质涂覆导体球的电磁散射解析解开展研究。各向异性铁氧体介质中电磁场的球矢量波函数解可表示成第一、二、三、四类球矢量波函数之和。根据球Bessel函数的性质，可以得出导体球涂覆各向异性铁氧体介质的球矢量波函数解析解。应用铁氧体与自由空间分界面上电磁场切向连续和在导体球面上切向电场等于零的边界条件以及球矢量波函数切向正交性质，可分别得出铁氧
2、体介质中电磁场和散射场的展开系数。给出了平面波入射情况下的数值计算结果。该文的结果可应用于有关微波器件、天线以及目标特征的分析和计算。关键词球矢量波函数，铁氧体，各向异性中图分类号：TM277文献标识码：A文章编号：1009-5896(2006)09-1740-04TheAnalyticalSolutiontotheElectromagneticScatteringbyanAnisotropicFerrite-CoatedConductingSphereGengYou-lin①WuXin-bao②GuanBo-ran①①(TheIn
3、stituteofAntennaandMicrowaves,HangzhouDianziUniversity,Hangzhou310018,China)②(ShanghaiResearchInstituteofMicrowaveTechnology,Shanghai200063,China)AbstractTheanalyticalsolutionofelectromagneticscatteringtoananisotropicferrite-coatedconductingspherebyaplanewaveisdiscusse
4、dinthispaper.Itiswellknownthattheelectromagneticfieldsinthree-dimensionalferritemediumandfreespacecanbeexpressedintosphericalvectorwavefunctionsofthefirst,second,thirdandfourthinferriteanisotropicmediumandisotropicmedium.Applyingthecontinueboundaryconditionoftangential
5、componentofelectromagneticfieldsintheinterfacebetweentheferriteanisotropicmediumandfreespace,andthetangentialelectricfieldvanishingintheinterfaceoftheconductingsphere,theexpansioncoefficientsofelectromagneticfieldswithsphericalvectorwavefunctioninferritemediumandthesca
6、tteringfieldsinfreespacecanbederived.Thetheoreticanalysisandnumericalresultshowthatwhentheradiusofconductingsphereapproacheszero,thepresentmethodcanbereducedtothatofthehomogeneousferriteanisotropicmedium.Thepresentmethodcanbeappliedtotheanalysesofrelatedmicrowavedevice
7、s,antennasandthecharacterofradartargets.KeywordsSphericalvectorwavefunction,Ferritemedium,Anisotropy1prefaceCurrently,theferriteinthemicrowaveandmillimeter-wavedevices(suchascirculators,isolators,switchesandphaseshifters)hasbeenwidelyused.Itsmaterialpropertiescanbewith
8、theappliedfieldstrengthanddirectionofthemagneticfieldchangesnotonlytheuniquenatureoftheferromagneticmaterialusedinmak
