Microstrip-to-CPW-transition

MicrostriptoCPWtransition2004-30338윤정훈AdvantageofMS&CPWLowcost,compactsize,andeasyintegrationfordevicesdemandLow-loss,wideband,andcompacttransitionTwomaintechniquesforthetransitionbyelectricalcontact•usuallycallforViaholes,bondingwires,orabruptstepsintheconductor•Compactsizeandwidebandwidth•Somedegreeofmechanicalcomplexitybyelectromagneticcoupling•Nowiredbondsorviaholes•NarrowbandwidthandlargersizeRecentlywiderbandwidthtransitionElectricalContact(1)Case1:ribbonSuperpositionoftwodifferentsubstrates•upperoneworksinamicrostripmode•loweroneworksinacoplanarmodeasmallcapacitanceisaddedatthebeginningofthecoplanarline•lowpassfiltermaximumcut-offfrequencyisrelatedwiththeheighth1GoldribboninductancecapacitanceElectricalContact(2)Case2:airbridgeMicrostriptoCPWonGaAschipsubstrateCase3:viaholeMicrostriptoCPWonoppositesidesofacommonsubstrateElectromagnetricCoupling(1)Case1:uniplanarthisoneusesthecouplingbetweenthegroundplaneofthemicrostripandthegroundplanesofthecoplanarline•AnalyzedasabandpassfiltercutofffrequencyisdeterminedbythelengthofthecouplingregionWithradialcouplingstubElectromagnetricCoupling(2)asnincreases,S11decreasesGradualtransformationReturnlossasthelengthofthetransitionincreases,BandwidthincreasesaswellCase2:SurfacetosurfacetransitionCPWononesubstratesurfacetoaMSonanotherTypes•Single-substratetransitiononoppositesidesofasinglesubstrategapsizeofroughly10%ofthetotallengthempiricallygivethebestresults•ChiptomotherboardtransitionElectromagnetricCoupling(3)Wirebonding•canseriouslydegradecircuitoperation•IsverylaborintensiveNowirebonding•Improveperformance•ReducecostgapElectromagnetricCoupling(4)ChiptomotherboardtransitionGroundplaneofthechipisremovedintheareaoverthecouplingregionThechipandmotherboardgroundplanescoincideSinglesubstratetransitionwideningbroadbandtransmissionbehaviorAsScisenlargedEMcouplingbecomestightRasiningtheequivalentseriescapacitiviecouplingConstituteaBroadPassbandwithtwominimumvalues(A)sWideningthewidthFutherexpandingthetransmissionpassbandAsScisenlarged,LowerendofapassbandismovedtolowfrequencyButhigherendofapassbandisunchanged(B)Bythecoupled-striplengthdAsdisenlarged,thewidepassbandgraduallymovesdownElectromagnetricCoupling(3)Case2:radialstubRadialshapeoftheopenstub&shortedarmallowwiderbandwidthoperationsignaliseffectivelytransferredthroughresonantcouplingmicrostripTwoshortslotarmsTworadialopenstubStubreactanceMutualcancellationconclusion여러구조의microstrip-to-CPWtransition.각transition의다지인패러미터.용도에맞는transition구조의선택및디자인에도움.Reference[1]Lin,T.-H.;Via-freebroadbandmicrostriptoCPWtransition,ElectronicsLetters,Volume:37,Issue:15,Pages:960-961,19Jul2001[2]Safwata,A.M.E.;Zaki,K.A.;Johnson,W.;Lee,C.H.;Noveldesignforcoplanarwaveguidetomicrostriptransition,MicrowaveSymposiumDigest,2001IEEEMTT-SInternational,Volume:2,20-25,Pages:607-610vol.2,May2001[3]LeiZhu;Menzel,W.;Broad-bandmicrostrip-to-CPWtransitionviafrequency-dependentelectromagneticcoupling,MicrowaveTheoryandTechniques,IEEETransactionson,Volume:52,Issue:5,Pages:1517–1522,May2004[4]Houdart,M.;Aury,C.;VariousExcitationofCoplanarWaveguide,MicrowaveSymposiumDigest,MTT-SInternational,Volume:79,Issue:1,Pages:116-118,Apr1979[5]HangJin;Vahldieck,R.;JifuHuang;Russer,P.;Rigorousanalysisofmixedtransmissionlineinterconnectsusingthefrequency-domainTLMmethod,MicrowaveTheoryandTechniques,IEEETransactionson,Volume:41,Issue:12,Pages:2248-2255,Dec.1993[6]Golja,B.;Sequeira,H.B.;Duncan,S.;Mendenilla,G.;Byer,N.E.;Acoplanar-to-microstriptransitionforW-bandcircuitfabricationwith100-μm-thickGaAswafers,MicrowaveandGuidedWaveLetters,IEEE[seealsoIEEEMicrowaveandWirelessComponentsLetters],Volume:3,Issue:2,Pages:29-31,Feb.1993[7]Gauthier,G.P.;Katehi,L.P.;Rebeiz,G.M.;W-Bandfinitegroundcoplanarwaveguide(FGGPW)tomicrostriplinetransition,MicrowaveSymposiumDigest,1998IEEEMTT-SInternational,Volume:1,7-12,Pages:107-109vol.1,June1998[8]GuizhenZheng;Papapolymerou,J.;Tentzeris,M.M.;WidebandcoplanarwaveguideRFprobepadtomicrostriptransitionswithoutviaholes,MicrowaveandWirelessComponentsLetters,IEEE[seealsoIEEEMicrowaveandGuidedWaveLetters],Volume:13,Issue:12,Pages:544-546,Dec.2003[9]Chiu,T.;Abuilding-blockdesignschemeforplanartransmission-linetransitions,Microwaves,AntennasandPropagation,IEEProceedings-,Volume:150,Issue:6,Pages:405-410,Dec2003[10]Burke,J.J.;Jackson,R.W.;Surface-to-surfacetransitionviaelectromagneticcouplingofmicrostripandcoplanarwaveguide,MicrowaveTheoryandTechniques,IEEETransactionson,Volume:37,Issue:3,Pages:519-525,March1989