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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
