预览加载中,请您耐心等待几秒...
1/2
2/2

在线预览结束,喜欢就下载吧,查找使用更方便

如果您无法下载资料,请参考说明:

1、部分资料下载需要金币,请确保您的账户上有足够的金币

2、已购买过的文档,再次下载不重复扣费

3、资料包下载后请先用软件解压,在使用对应软件打开

基于精细时程积分方法的时域格林函数计算(英文) Introduction: Time-domainGreen'sfunction(TDGF)calculationhasbecomeanessentialtechniqueinthefieldofelectromagneticmodeling.TheTDGFmethodallowstheanalysisofelectromagneticinteractionamongcomplexstructuresandmaterialsundertime-varyingfields.ThechallengeofTDGFcalculationishowtoobtainaccurateandefficientsolutionsforcomplexproblems.Oneofthemostpromisingapproachesisthefine-tunedtimeintegrationmethod(FTIM).ThispaperpresentsastudyontheFTIM-basedTDGFcalculationanditsapplicationinelectromagneticmodeling. FTIMMethod: FTIMisanumericalmethodthatintegratesthefieldequationsoversmalltimesteps.Theintegrationisdoneusingahigh-ordermethod,suchasthefourth-orderRunge-Kutta.However,thetimestepsizeisoptimizedusingafeedbacklooptominimizetheerror.Thefeedbackloopgeneratesanerrorestimatebasedonthedifferencebetweentwosolutionswithdifferenttimesteps.Basedontheerrorestimate,thenexttimestepsizeisadjustedtoreducetheerror.TheFTIMmethodhasbeenusedinvariouswavepropagationproblems,includingwaveguides,antennas,scattering,anddiffraction. TDGFCalculation: TDGFcalculationstartswiththesolutionofthetime-domainMaxwell'sequations.Thesourcefield(currentorvoltage)isusedtoexcitethestructure,andtheresultingelectromagneticfieldsarethencalculatedovertime.TheTDGFrepresentstheelectromagneticfieldataparticularpointinspaceandtime,causedbyaunitimpulseatadifferentpointinspaceandtime.TheTDGFcalculationcanbetime-consuming,especiallyforlargeandcomplexstructures.Therefore,efficientnumericalmethodsarerequiredtoobtainaccuratesolutionsinareasonabletime. FTIM-basedTDGFCalculation: TheFTIMmethodhasbeenappliedinTDGFcalculationtoreducethetime-stepsizeandincreasetheaccuracyofthesolution.IntheFTIM-basedTDGFcalculation,theimpulseresponseofthestructureiscalculated.Theimpulseresponseisobtainedbyexcitingthestructurewithaunitimpulseandcalculatingtheresultingelectromagneticwaveforms.TheTDGFisthencalculatedbyconvolvingtheimpulseresponsewiththeexcitationwaveform.TheFTIMmethodisusedtocalculatetheimpulseresponseandtheexci