cpw _ coplanar waveguide basics, advantages,disadvantages
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9/22/2015 CPW|CoplanarWaveguidebasics,Advantages,disadvantages
http://www.rfwirelessworld.com/Terminology/CPWCoplanarWaveguidebasics.html 1/5
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CPW(CoplanarWaveguide)Basics
ThispagecoversCPW(CoplanarWaveguide)basicsandprovideadvantagesanddisadvantagesofCoplanarWaveguide.
TheCoplanarWaveguideisaplanartransmissionline.ItiswidelyusedformicrowaveIntegratedCircuitdesign.
Asshowninthefigure,CoplanarWaveguideconsistsofaconductorstripatthemiddleandtwogroundplanes
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9/22/2015 CPW|CoplanarWaveguidebasics,Advantages,disadvantages
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arelocatedoneithersidesofcentreconductor.Alltheselieinthesameplane.
Incoplanarwaveguide,EMenergyisconcentratedwithinthedielectric.TheleakageoftheElectromagneticenergyintheaircanbecontrolledbyhavingsubstrateheight(h)twicethatofthewidth(S).ThecoplanarwaveguidesupportsquasiTEMmodeatlowfrequencieswhileitsupportsTEmodeathighfrequencies.
TheeffectivedielectricconstantofCPWissameasthatofslotline.Thecharacteristicimpedanceofacoplanarwaveguideisnotaffectedbythicknessanddependsonwidth(W)andspace(S).Thelowestcharacteristicimpedanceof20Ohmcanbeachievedbymaximumstripwidth(W)andminimumslotspace(S).Ittypicallyrangesfrom200to250Ohm.
AdvantagesofCoplanarWaveguide
Lowdispersionsimplerealisationduetoetchingononeside.broadbandperformance,asitdoesnotneedviaholesforshuntandserieselements
DisadvantagesofCoplanarWaveguide(CPW)
Fabricationofcoplanarwaveguideiscostlier.AsgoldribbonsareneededtosuppresshigherordermodesateveryquarterwavelengthsRelativethicksubstratesareneeded.
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