定向耦合器和3db电桥综述

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1、定向耦合器和3DB电桥综述ApplicationNoteonedirectiononatransmissionline.3dBHybrids??couldbethoughtofas3dBdirectionalcouplers.Despitethesesimilarities,theparametersusedtodescribesignalflowindirectionalcouplersandtheapplication,inactualuse,issufficientlydifferenttowarrantseparateconsiderations.180°Hybri

2、dsFunctionalDescriptionA180°hybridisareciprocalfour-portdevicewhichprovidestwoequalamplitudein・phasesignalswhenfedfromitssumport(?)andtwoequalamplitude180°out-of-phasesignalswhenfedfromitsdiffereneeport(?).Conversely,signalsinputintoportsCandDwilladdatthesumport(B)andthediffereneeofthetwos

3、ignalswillappearatthediffereneeport(A).Figurelisafunctionaldiagramwhichwillbeusedinthisarticletorepresentthe180°hybrid.PortBcanbeconsideredthesumportandportAisthedifferenceport.PortsAandBandportsCandDareisolatedpairsofports・IntroductionCouplersandhybridsaredevicesinwhichtwotransmissionline

4、spasscloseenoughtoeachotherforenergypropagatingononelinetocoupletotheotherline.A3dB90°or180°hybridsplitsaninputsignalintotwoequalamplitudeoutputs・Adirectionalcouplernormallysplitsaninputsignalintotwounequalamplitudeoutputs.Thisterminology"directionalC(0°)C(0°)PHASE°D(07180°)Figurela:RFFreq

5、uencies(Upto2000MHz)Figurelb:MicrowaveFrequencies(500MHzandUp)M/A-COMDivisionofAMPIncorporatedsNorthAmerica:Tel.(800)366-2266,Fax(800)618-8883sAsia/Paci?c:Tel.+85221118088,Fax+85221118087sEurope:Tel.+44(1344)869595,Fax+44(1344)300020www.macom.comAMPandConnectingataHigherLevelaretrademarks.

6、Speci?cationssubjecttochangewithoutnotice.10-5RFDirectionalCouplersand3dBHybridsM560V2.00TheRFandmicrowavefrequencydevicesaredesignedandrealizedusingdifferenttheory,techniques,andmedia.TheRFfrequencydevicesutilizecoupledwoundeoilsonferritecores・Themicrowavefrequencydevicesareconstructedusi

7、ngmicrostriporstriplinetechnologyandconsistofa3dBcouplerfeedingaSchiffmanphaseshifterandadelayline.Someultrabroadbandunitsutilizeatandem8.34dBcoupler"MagicT〃con?gurationasshownbelowinFigure2.Forthesecases,theimpedancesZA,ZB,ZC,andZD,areassumedtobeZO,thecharact