CST STUDIO SUITE 2014波导端口概述.doc

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1、WaveguidePortOverviewWaveguideportsrepresentaspecialkindofboundaryconditionofthecalculationdomain,enablingthestimulationaswellastheabsorptionofenergy.Thiskindofportsimulatesaninfinitelylongwaveguideconnectedtothestructure.Thewaveguidemodestraveloutofthestructuretowardtheboundaryplanesthusleavi

2、ngthecomputationdomainwithverylowlevelsofreflections.Verylowreflectionscanbeachievedwhenthewaveguidemodepatternsintheportmatchperfectlywiththemodepatternsfromthewaveguidesinsidethestructure.CSTMICROWAVESTUDIOusesa2Deigenmodesolvertocalculatethewaveguideportmodes.Thisprocedurecanprovideverylowl

3、evelsofreflectionbelow-100dBinsomecases.Ingeneral,thedefinitionofawaveguideportrequiresenclosingtheentirefieldfilleddomaininthecrosssectionofthetransmissionlinewiththeportarea.Theeigenmodesolvercanthencalculatetheexactportmodeswithintheseboundaries.Thenumberofmodestobeconsideredinthesolvercalc

4、ulationcanbedefinedinthewaveguideportdialog.Thestrategiestoproperlydefinewaveguideportsdependabitonthetypeofthetransmissionline. Inthefollowingwefocusonthemostcommonlyusedapplications.Pleasenotethattheinputsignalofanexcitedwaveguideportisnormalizedto1sqrt(Watt)peakpower.ContentsEmptyWaveguides

5、PortCreationPortModesCoaxialWaveguidesPortCreationPortModesMicrostripLinesPortModes/PortDimensionsPortCreationCoplanarLinesPortModes/PortDimensionsPortCreationInhomogeneousWaveguidePorts(SpecialTreatment)MicrostripLines/CoplanarLines(QTEMModes)DielectricallyLoadedWaveguides(NoQTEMModes)Multipi

6、nWaveguidePortsHomogeneousMultipinPortsInhomogeneousMultipinPortsPeriodicWaveguidePortsGeneralInformationLossesinWaveguidePortsImpedanceDefinitionModeCalibrationModePolarizationWaveguidePortsinHexahedralMeshViewSeealsoEmptyWaveguidesThemostfrequentlyusedwaveguidetypeofthiscategoryistherectangu

7、larwaveguideshownbelow:upPortCreationTheportassignmentforthistypeofwaveguideisquitesimple.However,itisimportanttomakesurethattheportcoverstheentirewaveguidecross-section.Theeasiestwaytodefineaport’sfaceistopickstructureelementssuchaspoi