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1、毕业设计(论文)英文翻译原文院(系):信息与通信学院专业:电子科学与技术学生姓名:XXXXXX学号:XXXXXXXXXX指导教师:XXXXXX职称:副教授2011年5月16日XXX毕业设计(论文)原文用纸第20页共21页CHAPTERIVAPPLICATIONEXAMPLESInthischapter,wepresentpracticalexamplesthatdemonstratetheuseofthetechniquesdevelopedinChapter2(NFFFT)andChapter3(TF/SFboundary)in
2、theFDTDanalysisofmultilayeredmedia.Inthepreviouschapters,weconsideredexamplesthatinvolvedthemethodthatisthesubjectoftherespectivechapter.Forexample,weonlyconsideredthefar-fieldradiationfromstructuresplacedonhalfspacesandgroundedslabsinChapter2.Similarly,weonlyinvestiga
3、tedtheperformanceoftheTF/SFboundary(namely,contain-mentoftheincidentplanewave,andtransparencytothescatteredwave)inChapter3.Inthischapter,webringintousebothofthemethodsdevelopedinChapter2–3;thatis,theexamplesutilizeboththeTF/SFboundary,andthenear-field-tofar-fieldtransfo
4、rm.4.1ScatteringinMultilayeredMediaInthissection,weconsidertwoproblemsthatinvolvethescatteringfromperfectlycon-ductingobjectsplacedinamultilayeredmedium,whentheincidentfieldisaplanewave.TheprocessofintroducingtheincidentplanewaveintotheFDTDgridnecessitatestheuseoftheTF
5、/SFboundaryformultilayeredmedia,whilethecalculationofthefar-zonefieldscatteredfromthescatteringobjectisdonebytheNFFFT.Forthisapproachtobesuccessful,thefieldsontheNFFFTboxinFig.6mustcompriseonlythescatteredfield.ThisisindeedthebasicpremiseoftheTF/SFboundarytechnique:allow
6、ingonlythescat-teredfieldtoexittheboundary.ThementionedtransparencyoftheTF/SFboundarytothescatteredwavewasdemonstratedinSection3.4.ThegeneralconfigurationusedforscatteringproblemsinmultilayeredmediaisshowninFig.33.TheTF/SFboundarycontainstheimperfections(orthescatterers
7、)inthemultilayeredmedium,denotedcollectivelyasA.FieldcorrectionsareappliedontheTF/SFboundarytocreateacontainedplanewave,denotedbythearrowintheupper-leftcorneroftheTF/SFboundary.Thescatteringstructurecreatesascatteredwave,denotedbythearrowintheupper-rightcorneroftheTF/
8、SFboundary.Thiswaveexitstheboundarywithcompletetransparency,andreachesthenear-field-to-far-fieldtransformer,denotedbySinFig.33