标签: coupler-hfss

directionalcoupler-HFSSDirectionalCouplers[1]THEQUADRATURE(90)HYBRIDTheHybridcouplerisoftenmadeofmicrostriporstriplineasshowninFigure1.ThemicrostripformisalsopicturedinFigure2.Thesecouplersare3dBdirectionalcouplerswitha90phasedifferencebetweentheoutputsofthethroughandcoupledlines.Itisalsoknownasabranch-linehybrid.Figure1.GeometryofaQuadratureHybridcoupler.[1]Figure2.PhotographofamicrostripQuadratureHybridcoupler.[1]ReferringtothegeometryofFigure1,theidealbranch-linecoupler,withallportsmatchedandpowerenteringport1,hasevenlydividedoutputsatports2and3witha90phasedifferencebetweenthem.Theisolatedport(port4)hasnopowerexitingit.Theresulting[S]matrixisthengivenby(1)0j101j0……