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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
