CST-STUDIO-SUITE-2014离散端口概述

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

2、nasavoltageorcurrentsourceorasanimpedanceelementthatalsoabsorbspowerandenablesS-parametercalculation.Discreteportsaremainlyusedtosimulatelumpedelementsourcesinsidethecalculationdomain.Theseportsareagoodapproximationforthesourceinthefeedingpointofantennaswhen

3、calculatingfarfields.Insomecases,theseportsmayalsobeusedtoterminatecoaxialcablesormicrostriplines.However,duetothetransmissionbetweentransmissionlinesofdifferentgeometricdimensions,reflectionsmayoccurthataremuchlargerthanthosefortheterminationwithwaveguidepo

4、rts.Forlowerfrequencies(comparedtothedimensionofthediscreteport),thesereflectionsmaybesufficientlysmall,suchthatthesekindsofportsmayalsobeusedsuccessfullyfortheS-parametercalculationsofmultipinconnectors.Pleasenotethattheinputsignalfortheportisnormalizeddepe

5、ndingonthechosenporttype.ContentsDiscreteEdgePortsGeneralDescriptionConstructionPortTypesMeshRepresentationSymmetryPlanesDiscreteFacePortsGeneralDescriptionConstructionPortTypesSeealsoDiscreteEdgePortsGeneralDescriptionAlthoughthewaveguideportsarethemostaccu

6、ratewaytoterminateawaveguide,discreteedgeportsaresometimesmoreconvenienttouse.Discreteedgeportshavetwopinswithwhichtheycanbeconnectedtothestructure.Thiskindofportisoftenusedasfeedingpointsourceforantennasorastheterminationoftransmissionlinesatverylowfrequenc

7、ies.Athigherfrequencies(e.g.thelengthofthediscreteportislongerthanatenthofawavelength)theS-parametersmaydifferfromthosewhenusingwaveguideportsbecauseoftheimpropermatchbetweentheportandthestructure.ConstructionAdiscreteedgeportconsistsofaperfectconductingwire

8、connectingstartandendpointsandalumpedelementinthecenterofthewire.Thetypicalwaytodefineadiscreteportistopickitstwoendpointsfromthestructureusingthecommonpicktoolsandthentoenterthediscreteportdial