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ID:32476401
大小:3.08 MB
页数:66页
时间:2019-02-07
《车载多天线系统的fdtd方法研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文采用时域有限差分方法(FDTD)对车载多天线系统进行电磁兼容特性分析。时域有限差分法作为一种瞬态时域方法,它直接从麦克斯韦方程出发,能充分形象地模拟电磁波的传播过程,且在脉冲激励下,仪需一次汁算便可得到宽频带的频域信息。另外,可方便用来处理复杂介质和形状目标的电磁问题,计算程序有很强的通用性。基于上述特点,本文将其用于车载多天线系统的模拟仿真,并根据计算结果实现电磁兼容预测分析。首先简单介绍了FDTD的基木原理、差分格式以及相关理论。主要有:数值理论、吸收边界和激励源技术等。然后建立了基于FDTD的车载多天线系统分析模型,包含基于面元模型
2、的车体网格划分和基于细导线FDTD的天线建模技术。结合上述理论,本文重点叙述了FDTD的近远场外推方法,建立了对天线进行樱合分析和辐射分析的理论模型,实现了车载多天线的特’眭分析。另外,本义还对传统FDTD进行详细总结,并简单介绍了改进后的新算法——基于交替方向隐式技术的FDTD方法(ADI.FDTD)的基本实现原理。最后,洋细阐述了软件设计的基本思想、总体思路和核心算法的具体实现,并给出了具体实例验证。关键词:电磁兼容时域有限差分法天线干扰耦合AbstractInthisthesis.theEMCcharacteristicofmulti-an
3、tennasonavehicularplatformiSanalyzedusingthefinite-differencelime—domain(FDTD)method。FDTDisakindoftransienttimedomainmethod,whichisderiveddirectlyfromthedifferentialformofMaxwell’Sequationsinthetimedomain.FDTDcansimulatethepropagationprocessingofelectromagneticwaveveryclearly
4、.Iftheexcitationisapulsesource,theresponseinfrequencydomaincanbeobtainedoverawidebandwidthwithoneFDTDcalculation.Moreover,FDTDcanbeconvenientlyusedtodealwiththeproblemofcomplicateshapeincomplicatemedium.TheprocedureofFDTDmethodisveryuniversalandcanbewidelyappliedindifferentki
5、ndsofsystem.So,itisappliedinthesimulationofvehicularcommunicationmulti-antennasysteminthispaper.TheEMCpredictionisachievedsuccessfullyaccordingthecalculationresults.Firstly,thebasicprinciple,thedifferentialformofFDTDandotherrelativetheoriesareproposed.Themaincontentincludesnu
6、mericalmodelingtheories,absorbingboundaryconditionandthetechnologyofexcitation,etc.Secondly,thecalculationandanalysismodelofvehicularcommunicationmulti—antennasystemisbuilt.Theestablishmentofmodeliscomposedoftwoaspects:meshingofthevehicularandmodelofantennas.Theformeroneisbas
7、edonthepatchandthelatteroneisFDTDtechnologyofthinwire.Combinedallthesetheoriespresentedabove,aFDTDnear-zonetofar-zonetransformationisdescribedindetail.Theanalysismodelofantenna’Scouplingandradiationcharacteristicareestablishedinthepaper.And,theEMCcharacteristicanalysisofanten
8、nasonvehicularplatformisachieved.Moreover,thesummaryfortheadvantagea
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