EMP模拟器用GTEM小室接头的优化设计-豆柴文库

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EMP模拟器用GTEM小室接头的优化设计
I.Introduction
Sincetheadvancementoftechnology,electronicsystemshavebecomeanintegralpartofdailyactivities.Anelectromagneticpulse(EMP)isasuddenburstofelectromagneticradiationthatcanseverelydamageelectronicsystems.Thiscanhavedisastrousconsequencesformilitaryandcivilianapplicationswhereelectronicsystemsarecritical.Tomitigatethisrisk,thereisanincreasingdemandforEMPsimulators.EMPsimulatorsrecreatethecharacteristicsofEMPandallowtestingofelectronicsystemsinacontrolledenvironment.
EMPsimulatorsuseavarietyofantennasortheircombinationsforgeneratingelectromagneticfields.TheGTEM(GigahertzTransverseElectromagnetic)cellisincreasinglyusedasapreferredmethodforgeneratingEMPandtestingelectronicsystems.TheGTEMcellprovidesapracticalandsafemethodforbothEMClaboratorytestingandfieldmeasurements.Inthispaper,wefocusontheoptimizationoftheGTEMcellforEMPsimulator.
II.TheGTEMCell
TheGTEMcellconsistsofataperedconductingchamberwithacoaxialportwherethesignalentersandexits.Thecellhasataperedrectangularcross-sectionandterminatesintoaclosedend.TheGTEMcellhasbeenusedextensivelyforEMC(ElectromagneticCompatibility)testing.
TheGTEMcellgeneratesaTEM(TransverseElectromagnetic)modeinsidethecell,whichpropagatesintheTEMwaveguide.TEMmodeisatypeofelectromagneticwavethatpropagateswithoutchangingitsshapealongthewaveguide.Thewavepropagatesacrosstheconductivewallsofthecellandcreatesafielduniformityzone.ThelengthoftheGTEMcelldeterminesthefrequencyoftheuniformfieldregion.ThewavelengthoftheelectromagneticwavemustbeproportionaltothelengthoftheGTEMcell.
III.EMPSimulator
EMPsimulatorsaredesignedtosimulatetheeffectsofelectromagneticpulses.EMPsimulatorsuseavarietyofantennasortheircombinationsforgeneratingelectromagneticfields.TheEMPsimulatorgeneratesanelectromagneticwavethatpropagatesinsidetheGTEMcell.TheelectromagneticwavecreatesauniformfieldintheGTEMcell.TheE-field,H-field,andpowerdensityofthegeneratedfieldcanbecontrolledandadjustedtosimulatedifferentEMPs.
TheEMPsimulatorgeneratesawaveformthatsimulat