RFConceptTrainingRF连接器概念培训

RFConceptTrainingRF连接器概念培训第1页/共30页WirelessInfrastructureMarketMarketDrivers

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SMATypeNMCXSMB,MCXMMCXSemi-RigidAssembliesRFSwitch第2页/共30页RFConnectorAnatomyWhatisRFConnector?AconnectorisadeviceusedtoconnecttocablesorotherdevicesthroughwhichelectromagneticenergyistransferredfromoneplacetoanotherBody-Contact-InsulatorBodyContactInsulator第3页/共30页ConnectorAnatomyDiscontinuityCompensationStepsContactBarbSlottedContact第4页/共30页CableAnatomyWhatisRFCable?CableisatransmissionlinethroughwhichelectromagneticenergyispropagatedandtransferredfromoneplacetoanotherJacket-Braid-Shield-Dielectric-CenterConductorConductorDielectricJacketShieldBraid第5页/共30页TypesofCable1.FlexibleCoax 2.Corrugated3.Semi-Flexible4.Semi-Rigid第6页/共30页DevelopmentProductDeveloped Freq. Imp. Coupling CommentsUHF 1930’s 300MHz n/a Threaded AmphenolengineerClark Quackenbushinventedforuseinthe RadioIndustry.N 1940’s 11GHz 50,75 Threaded InventedbyPaulNeillofBellLabs. Firsttruemicrowaveperformance.C 1940’s 10GHz 50 Bayonet AmphenolengineerCarlConcelman inventedabayonetversionofthe TypeNforquickinstallation.BNC late1940’s 4GHz 50,75 Bayonet MiniatureversionoftheTypeC. NamedforAmphenolengineer ConcelmanandBellLabsengineer Neill.BayonetNeillConcelman.TNC late1950’s 11GHz 50 Threaded ThreadedversionoftheBNCforuse inhighvibrationapplications. ThreadedNeillConcelman.第7页/共30页DevelopmentProduct Developed Freq. Imp. Coupling CommentsSMA 1960’s 18GHz 50 Threaded Semi-precisionconnectororiginallydevelopedfor.141semi-rigidcable,1/4-36threadedcoupling.Sub-MiniatureA.SMB 1960’s 4GHz 50,75 Snap-On VersionofSMAwithsnap-oninterface.Sub-MiniatureB.SMC 1960’s 10GHz 50 Threaded VersionofSMBwiththreadedcouplingforhighvibration.Couplingis10-32(10=.190”).Sub-MiniatureC.Mini-UHF 1970’s 2.5GHz 50 Threaded MiniatureversionoftheUHFinventedbyAmphenolengineer,Quackenbush,inthe1930’s.第8页/共30页DevelopmentProduct Developed Freq. Imp. Coupling CommentsMCX 1980’s 6GHz 50 Snap-On MicroCoaxis

atrade nameofH+S Theself-centeringspringisthereverse oftheSMBandallowsa30%size reduction.Designed inEuropeunder Mil-SpecCECCtocompetewith AmericanSMB.MMCX 1990’s 6GHz 50 Snap-on MiniatureversionoftheMCX offering25%sizereduction. DesignedinEuropetocompete withAmericanSSMBdesign.1.0/2.3 1990’s 4,10GHz 50 Push-Pull, DevelopedinEuropefortheTelecom Threaded industry.SimilarinsizetotheSMB.7/16 1990’s 7GHz 50 Threaded DevelopedinEuropeforBase StationsandCellSiteAntennas. 7mmisODofinnerconductor,16mm istheIDoftheouterconductor(body).第9页/共30页CouplingThreaded Bayonet Snap-On Push-Pull1.6/5.6 BNC MCX 1.0/2.37/16 HDBNC MMCX SMBMini-UHF TypeC SMBSMA TypeGSMC TypeFTypeNTNCTwinaxialUHFThreaded-Screw-oncouplingrequiresmoretimetoinstallbutisexcellentinhighvibrationapplicationsandoperatesoverthehighestfrequencyrangesinceitaffordsthebestconnection.Bayonet,Snap-on,Push-pull-Thesecouplingsensurequickinstallationandareeasiertotroubleshoot.第10页/共30页Frequency Frequency:Since

RF/microwavesignalsareAC(alternatingcurrent),theyswingfromapositivetoanegativevalueinacycle.Thenumberofcyclespersecondisthefrequency(measuredinHertz).SomeTypicalFrequencies:AMRadio 500-1500kHzShortwaveRadio 10MHzTV 60-250MHzCellularPhone 824-894MHzDigital(PCS)Phone 1850-1990MHzRadar 6-26GHzDirectBroadcastSatellite(DBS) 12GHz第11页/共30页FrequencyChart(GHz)第12页/共30页Definitions VSWR AcronymforVoltageStandingWaveRatio.VSWRistheratioofvoltageappliedtovoltagereflected.Itisthemajorfactorcontributingtothetotalsignalefficiencyoftheconnector.InsertionLoss Totallossofpoweratthereceivingpointafterinsertionofacomponentintothetransmissionline.It’sdependentontheconnector’sinsulation&conductormaterialsandisthesecondmajorfactorinsignalefficiency.ReturnLoss Theportionofasignalthatislostduetoareflectionofpoweratalinediscontinuity.ReturnLossisproportionaltoVSWRandispreferredintheCATVindustrytoaVSWRspecification.Voltagerating Themaximumoperatingvoltagethedevicecanwithstandwithoutbreakdown.D.W.V. DielectricWithstandVoltageisthemaximumhighvoltagesurgethedielectric(insulator)canwithstandwithoutbreakdown.第13页/共30页VectorNetworkAnalyzer第14页/共30页PlatingThetablebelowshowscommonplatingandbasemetals.Theelectricalconductivityisrelativetothatofbrass.Forexample,Silverisa2.41timesbetterconductorthanbrass. Relative Corrosion Material Conductivity Durability Resistance Silver 2.41 Good Average Copper 2.27 Average Poor Gold 1.60 Excellent Excellent Brass 1.00 Average Average Zinc 0.65 Poor Poor Nickel 0.57 Good Good StainlessSteel 0.05 Excellent ExcellentConnectorbodiesareusuallyplatedwithGold,NickelorSilver.DrawbacksarethatGoldandSilveraremoreexpensivewhileNickelisnotasgoodaconductor;Silveralsotarnisheseasily.Nickel’slowconductivityisnotaproblembelowafewGHz.第15页/共30页SelectionGuidelines Selectaseries: 1.Impedance: Typicalimpedanceofasystemis50or75ohm.SeeOverviewincatalogforimpedancebyseries. 2.FrequencyRange: Connectorseriesrangefrom