CST_STUDIO_SUITE_2014离散端口概述

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1、DiscretePortOverviewBesidewaveguideportsorplanewaves,thediscreteportsoffersanotherpossibilitytofeedthecalculationdomainwithpower.Twomainporttypesareavailable:thediscreteedgeandthediscretefaceport.Theyaredividedinthreedifferentsubtypes,consideringtheexci

2、tationasavoltageorcurrentsourceorasanimpedanceelementthatalsoabsorbspowerandenablesS-parametercalculation.Discreteportsaremainlyusedtosimulatelumpedelementsourcesinsidethecalculationdomain.Theseportsareagoodapproximationforthesourceinthefeedingpointofan

3、tennaswhencalculatingfarfields.Insomecases,theseportsmayalsobeusedtoterminatecoaxialcablesormicrostriplines.However,duetothetransmissionbetweentransmissionlinesofdifferentgeometricdimensions,reflectionsmayoccurthataremuchlargerthanthoseforthetermination

4、withwaveguideports.Forlowerfrequencies(comparedtothedimensionofthediscreteport),thesereflectionsmaybesufficientlysmall,suchthatthesekindsofportsmayalsobeusedsuccessfullyfortheS-parametercalculationsofmultipinconnectors.Pleasenotethattheinputsignalforthe

5、portisnormalizeddependingonthechosenporttype.ContentsDiscreteEdgePortsGeneralDescriptionConstructionPortTypesMeshRepresentationSymmetryPlanesDiscreteFacePortsGeneralDescriptionConstructionPortTypesSeealsoDiscreteEdgePortsGeneralDescriptionAlthoughthewav

6、eguideportsarethemostaccuratewaytoterminateawaveguide,discreteedgeportsaresometimesmoreconvenienttouse.Discreteedgeportshavetwopinswithwhichtheycanbeconnectedtothestructure.Thiskindofportisoftenusedasfeedingpointsourceforantennasorastheterminationoftran

7、smissionlinesatverylowfrequencies.Athigherfrequencies(e.g.thelengthofthediscreteportislongerthanatenthofawavelength)theS-parametersmaydifferfromthosewhenusingwaveguideportsbecauseoftheimpropermatchbetweentheportandthestructure.ConstructionAdiscreteedgep

8、ortconsistsofaperfectconductingwireconnectingstartandendpointsandalumpedelementinthecenterofthewire.Thetypicalwaytodefineadiscreteportistopickitstwoendpointsfromthestructureusingthecommonpicktoolsandthentoenterthediscreteportdial