例五：同軸轉(zhuǎn)彎接頭計算電子科技大學(xué)物理電子學(xué)院朱兆君TheCoaxialBendwithaTuningstub1261.7241StartCSTMICROWAVESTUDIO?SetUnitandBackgroundMaterialsModeltheStructure(1)ModeltheStructure(2)ModeltheStructure(3)ModeltheStructure(4)ModeltheStructure(5)ModeltheStructure(6)ModeltheStructure(7)ModeltheStructure(8)ModeltheStructure(9)createthefirstpartoftheconductor(1)createthefirstpartoftheconductor(2)ChangeWCSCreatetheSecondConductor(1)CreatetheSecondConductor(2)AddtheConductors(1)AddtheConductors(2)FinalResultwithdifferentvisualizationoptions:SettingFrequencySettingBoundaryConditionSettingSymmetryPlaneDefinePorts(1)DefinePorts(2)DefinePorts(3)DefinePorts(4)VisualizetheMeshMeshMeshView

Theredpointsinthemodelarecriticalpoints(socalledfixpoints)wheretheexpertsystemfindsitnecessarytohavemeshlinesatthislocation.Theyellowdotsshowpointswheretheautomaticmeshgenerationfindstheneedforimprovingthemeshdensity.StarttheSimulationInthisdialogboxyoucanspecifywhichcolumnoftheS-matrixshouldbecalculated.ThereforeselectthestimulationPortforwhichthecouplingstoallotherportswillthenbecalculatedonasinglesimulationrun.Inourexample,activatingthestimulationforport1,theS-parametersS11,S21willbecalculated.Settingthestimulationportto2willcalculateS22andS12.NormalizedbyFixedImpedanceTheAccuracySolversProgress1.Checkingmodel:Duringthisstep,yourinputmodelwillbecheckedforerrorssuchasinvalidoverlappingmaterials,etc.2.Calculatingmatrixanddualmatrix:Duringthesestepsthesystemofequations,whichwillsubsequentlybesolved,willbesetup.3.Calculatingtheportmodes:Inthisstepthesolvercalculatestheportmodefielddistributionsandpropagationcharacteristicsaswellastheportimpedances’.Thisinformationwillbeusedlaterinthetimedomainanalysisofthestructure.4.Processingexcitation:Duringthisstageaninputsignalwillbefedintothestimulationport.Thesolverthencalculatestheresultingfielddistributioninsidethestructureaswellasthemodeamplitudesatallotherports.FromthisinformationthefrequencydependentS-parametersarecalculatedinasecondstepusingaFourierTransformation.5.Transientanalysis:Aftertheexcitationpulsehasvanished,thereisstillelectromagneticfieldenergyinsidethestructure.ThesolverthencontinuestocalculatethefielddistributionandtheS-parametersuntiltheenergyinsidethestructurehasdecayedtounderacertainlimit(specifiedbytheAccuracysettinginthesolverdialogbox).AnalyzethePortModes(1)AnalyzethePortModes(2)AnalyzetheSParameters(1)AnalyzetheSParameters(2)AnalyzetheSParameters(3)AdaptiveMeshRefinementAdaptiveMeshRefinementS11S21PortImpedanceAnalyzetheElectromagneticFieldatVariousFrequenciesThefieldscanberecordedatarbitraryfrequenciesduringasimulation.However,itisnotpossibletostorethefieldpatternsatallavailablefrequenciesasthiswouldrequireatremendousamountofmemoryspace.Youshould,therefore,definesomefrequencypointsatwhichthesolverwillrecordthefieldsduringasubsequentanalysis.Thesefieldsamplesarecalledmonitors.E_FieldSurfaceCurrentParameterizationoftheModel（1）ParameterizationoftheModel（2）ParameterizationoftheModel（3）1ParameterizationoftheModel（4）124356Results(1)Results(2)AutomaticOptimizationofthe

Structure1SettingtheGoal(1)SettingtheGoal(2)AddingtheGoalConditionsOperator:min:TheoptimizertriestominimizetheS-parameterdata.MinimizingtheS-parameterdatameansthattheoptimizertriestofindaparametersettingwherethemaximumoftheS-parametersoverthegiven

frequencyrangeisaslowaspossible.max:TheoptimizertriestomaximizetheS-parameterdata.MaximizingtheS-parameterdatameansthattheoptimizertriestofindaparametersettingwheretheminimumoftheS-parametersoverthegiven

frequencyrangeisashighaspossible.<:

Thisoperatorissimilarto“min”.TheoptimizertriestofindaparametersettingwherethemaximumoftheS-parametersoverthegivenfrequencyrange

islowerthanthegiventarget.Ifthetargetis0.0andtheS-parametermagnitudedataisselectedforevaluationthe“min”and“<”operatorsareequivalent.>:Thisoperatorissimilarto“max”.TheoptimizertriestofindaparametersettingwheretheminimumoftheS-parametersoverthegivenfrequencyrange

ishigherthanthegiventarget.Ifthetargetis1.0andtheS-parametermagnitudedataisselectedforevaluationthe“max”and“>”operatorsareequivalent.=:

YoushouldusethisoperatorifyouwanttheS-parameterdatabecomeascloseaspossibletothegiventargetvaluewithinthegivenfrequencyrange.movemin:UsethisoperatorifyouwanttominimizethedistanceoftheminimumoftheS-parametermagnitudetoagivenfrequency.(DoesonlyapplytoS-parametermagnitudedatawiththetotaloralimitedfrequencyrange).movemax:UsethisoperatorifyouwanttominimizethedistanceofthemaximumoftheS-parametermagnitudetoagivenfrequency.(DoesonlyapplytoS-parametermagnitudedatawiththetotaloralimitedfrequencyrange).OptimizationGoalsMaximumMinimumSpecialPointTargetMinMaxMoveMinMoveMax<>=OptimizerTypeOptimizertypeInterpolatedQuasiNewton:Selectstheoptimizersupportinginterpolationofprimarydata.ThisoptimizerisfastincomparisontotheClassicPowelloptimizerbutmaybelessaccurate.Inaddition,youcansetthenumberNofoptimizerpasses(1to10)forthisoptimizertype.AnumberNgreaterthan1forcestheo