左手媒質(zhì)的電磁特性研究與左手媒質(zhì)結(jié)構(gòu)的參數(shù)提取

1、東南大學(xué)碩士學(xué)位論文左手媒質(zhì)的電磁特性研究與左手媒質(zhì)結(jié)構(gòu)的參數(shù)提取姓名：王曦申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：電磁場(chǎng)與微波技術(shù)指導(dǎo)教師：崔鐵軍20070101東南大學(xué)碩士學(xué)位論文StudyonElectromagneticPropertiesofLeftHandedMaterialsandElectromagneticParameterRetrievalofLeftHandedStructuresMasterCandidate：WangXiSup

2、ervisor：ProLCuiTieJunSoutheastUniversityNanjingPILChinaAbstraet1rheconceptoflefthandedmaterial(I棚喝wasfirstputforwardbyVeselagoin1967，whopredicted“WaordinaryphenomenainassociationwithLHmedia：thereversalofSnell’slawthereve

3、rsalofDopplereffectandthetransformationofapointsourceintoapointimage畸aflatLHslabIn1999JBPen&yrealizedsuchmaterialsusingperiodicstructuresconsistingofanarrayofsplitringrusonatorsthatexhibRanegativepermeabilityandallarrayo

4、fmetallicprintedlinesthatexhibRanegativepermittivityTheexperimentverifyingthenegativeindexofrefractionwasfirstcarriedOUtbyD＆Smithin2000SincethenplentyofpapersstudyingLHMhavebeenreportedDuetotheapparitionofanegativesignin

5、therefractiveindexoftheLHmedium，PoyntingvectorisantiparalleltothepropagationvectorTherefore，theLHMwasarguedtoviolatetheeausali螄Throughanexactanalysisandnumericalexperimentsoftheelectromagneticfieldsradiatedbyaloopantenna

6、IhaveshownthatifpermittivityandpcrmeabilityoftheLHmediumsarisfytheLorentzmodel，thecausalitywillnotbeviolatedInthefrequencydomainLHslabisabletoamplifythemagnitudeofevanescentwavesandcompensatethephasedelayofpropagatingwav

7、es，andhenceitCallbreakthelimitationofatraditionallensHoweverarealsoln∞oRencontainsalargespectrum，andatthesametime。theconstitutiveparametersofarealLHslabafefrequencydispersivewhichmayleadpeopleowonderifthereisanimagepoint

8、inthetimedomainwhenareal$our∞isplacedinfrontofarealLHslabInthispapera‘a(chǎn)ctSommerfeldintegralsolutionisusediththeFFTtechniquetoinvestigatetheimagingpropertiesofalinesourcewithGaussianpulseandsinusoidalpulseexcitationThenum

9、ericalresultssuggestthattheelectromagneticwaveswouldnotfocusifthesourc￡currentsincludeawiderangeoffrequencycomponentsinwhichboththepcrmittivityandpermeabilityoftheLHslabdeviatefrom—lsignificantlyIncontrasttothetraditiona

10、ltransmissionlines㈣ItohproposedtheconceptofLHtransmissionlinesDuetotheinfluenceofparasiticparametersthereisnopureLH1LwhenfabricatedbymicrowavecircuitsAsacouseqnenceartificialU11Lisactuallycompositeleft／righthanded(CRLH)T

11、LThcteamofltohgaveasetoftheoreticalanalysisBasedontheirtheow，IhaveestablishednmethodtO1％qricvebothconstitutiveparametersandcircuitpardmatersfromSparametersThesimulationandnumericalresultsofdistributedcircuitsandlumpedcir