电磁波英文讲解课件160

电磁波讲解课件1电磁波传输线基础知识2Parallel-PlateWaveguide3Maxwell’sEqn.toWaveEqn.4SolutionofWaveEquations5DefinitionofVandI6Telegrapher’sEquations7WaveEquationsofVandI8SolutiontoWaveEquationsofV,I9EquivalentLumped-circuitofanInfinitesimalParallel-plateWaveguide10VoltageandCurrentwaves11Z0:characteristicimpedance(Ω)Telegrapher’sEqn.inFrequencyDomain12Timeharmonic:PhasorFormofVandI13VoltageandCurrentWavesalongaTransmissionLine14KVLatsourceterminal:KVLatloadterminal:VoltageReflectionCoefficientbyTransient-stateAnalysis(1)15+_+_VoltageReflectionCoefficientbyTransient-stateAnalysis(2)16currentreflectioncoefficient:+_Steady-stateVoltageatSourceTerminal17+_Space-timeDiagram18电磁波线路末端连接电阻负载，传输线断路19VoltageandCurrentinTransmissionLine20ReflectionandTransmissionCoefficientsbetweenTwoTransmissionLines(1/2)21ReflectionandTransmissionCoefficientsbetweenTwoTransmissionLines(2/2)22Example1-ThreeTransmissionLinesMatchedatsourceandload23Time-spaceDiagramofExample124OutputVoltagewithDeltaInput

inExample125OutputVoltagewithHarmonicInput

inExample126Transmission-lineDiscontinuity

withInsertedResistor27EvaluationofReflection

andTransmissionCoefficients28EquivalentLumped-circuitofanInfinitesimalParallel-plateWaveguide29Time-domain

Reflectometry30Example3:InductiveLoad31Example3:Solution32initialconditionExercise:CapacitiveLoad33VoltageandCurrentatz=l34PropagationofVandIWaves35PropagationofVandIWaves36Example437ConservationofEnergy38电磁波具有非线性负载的线路，两条线路之间的串扰39att=0,z=0att=T,z=lNonlinearLoad(1/2)40NonlinearLoad(2/2)att=2T,z=041GraphicAnalysis42att=0+,z=0

att=0-,z=0

Example6.643Example6.6att=T,z=0

44GraphicAnalysis45TransmissionLinewithTTLLoad46CrosstalkfromInfinitesimalSegment47CrosstalkinReverseDirection48TotalCrosstalkinBothDirections49电磁波谐振模式，阻抗与反射系数之间的双线性变换50TransmissionLinewithShort-circuitedLoad51ResonantModesorNaturalModes52InputReactance53TwoTransmissionlineswith

Short-circuitedLoads54TransmissionLinewithanArbitraryLoad55ReflectionCoefficientatAnyz56CalculateAdmittancein

-plane

57VoltageStandingWaveRatio(VSWR)58ReflectionCoefficientatLoad59SmithChart60Quarter-wavelengthTransformer61电磁波单短截线和双短截线阻抗互感器62Single-stubTransformer(1/2)63Single-stubTransformer(2/2)64Double-stubTransformer65SmithChart66ConstantrcirclesConstantxcirclesExample:Single-stubTransformer(1/2)67Example:Single-stubTransformer(2/2)68Example:Double-stubTransformer(1/2)69Example:Double-stubTransformer(2/2)70电磁波损失线和扩散方程71CircuitModelofLossyLine(1/2)72CircuitModelofLossyLine(2/2)73SolutionofTelegrapher’sEquations74CharacteristicImpedance75InputImpedanceofLossyLine76SpecialCasesofInputImpedance77Time-averagedPowerinaLossyLine78Example79LumpedCircuitModelatLowFrequencies80DiffusionEquationandItsSolution81Example82VoltageDistributionatDifferentInstants83损失线和扩散方程84CircuitModelofLossyLine(1/2)85CircuitModelofLossyLine(2/2)86SolutionofTelegrapher’sEquations87CharacteristicImpedance88InputImpedanceofLossyLine89SpecialCasesofInputImpedance90Time-averagedPowerinaLossyLine91Example92LumpedCircuitModelatLowFrequencies93DiffusionEquationandItsSolution94Example95VoltageDistributionatDifferentInstants96电磁波势函数和赫兹偶极子97WaveEquationforPotentialFunction98InahomogeneousmediumwithLorentzgaugeHertzianDipole99SolutionofVectorPotential100Sphericallysymmetric101ExpressionofMagneticFieldExpressionofElectricFieldApproximationintheFar-fieldRegion103电磁波平行板波导中任意方向的均匀平面波传播104PlaneWaves105sphericalwave-->planewavePlane

Waves106Wave-frontof

PlaneWave107108PhasevelocityandItsComponentsTEMWaves109Inaparallel-platewaveguide:TMWaves110Inaparallel-platewaveguide:TMModes111ReflectionofTMModesatInterface112113ReflectionofTEModesatInterface电磁波平面波的反射和折射、色散和群速度114TEWave115PhaseMatchingConditionReflection/RefractionCoefficients117TMWavePhaseMatchingCondition119Reflection/RefractionCoefficients120PhaseVelocity121Brewster’sAngle122CriticalAngle123PropagationofNarrow-bandTMSignal124PhaseVelocityandGroupVelocity125电磁波介质板导引126TEMode

(EvenMode)127GraphicSolution128GuidedPower129TotalReflectionatBoundarySurfaces130CutoffCondition131TEMode

(OddMode)132GraphicSolution133TMMode

(EvenMode)134GraphicSolution135TMMode

(OddMode)136GraphicSolution电磁波矩形金属波导和腔体谐振器138RectangularWaveguide139DecompositionofMaxwell’sEqns.140ExpressinTermsof141SolutionsofModes142ImposeBoundaryConditions143CutoffPhenomenon144SolutionsofModes145ImposeBoundaryConditions146CutoffPhenomenon147CavityResonator148SolutionsofModes149ResonantFrequencySolutionsofModes151ResonantFrequency矩形金属波导和腔谐振器的损耗，赫兹偶极子和阵列的辐射特性153PlaneWaveIncidencetoa

HighlyConductiveMedium154PowerDissipationinaRectangularWaveguide155PowerDissipationinaRectangularWaveguide156EstimationofAttenuationConstant158PowerDissipationinaRectangularCavityResonator159