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ANTENNAPARAMETERSAmanHuang2005/9/12AUDENTECHNO.COM.OutlineVSWRReturnLossAntennaGainEIRPSensitivityAUDENTECHNO.COM.V.S.W.R.Inatransmissionline,theratioofmaximumtominimumvoltageinastandingwavepattern.Note:TheVSWRisameasureofimpedancemismatchbetweenthetransmissionlineanditsload.ThehighertheVSWR,thegreaterthemismatch.TheminimumVSWR,i.e.,thatwhichcorrespondstoaperfectimpedancematch,isunityAUDENTECHNO.COM.V.S.W.R.PiZi−Z0LoadingSignalΓ=PoPrZi+Z01+ΓVVSWR==max1−ΓVminΓ:reflectioncoefficientAUDENTECHNO.COM.ReturnLossTheratio,atthejunctionofatransmissionlineandaterminatingimpedanceorotherdiscontinuity,oftheamplitudeofthereflectedwavetotheamplitudeoftheincidentwave.1:ReturnlossisusuallyexpressedindB.2:Returnlossisameasureofthedissimilaritybetweenimpedancesinmetallictransmissionlinesandloads,orbetweenrefractiveindicesindielectricmedia,e.g.,opticalfibers.AUDENTECHNO.COM.ReturnLossZi−ZoRL=−20log10Zi+ZoRL=−20log10ΓAUDENTECHNO.COM.VSWR&ReturnlossAUDENTECHNO.COM.RadiationPatternDefinition:Thespatialdistributionofaquantitythatcharacterizestheelectromagneticfieldsradiatedbyanantenna.Apolardiagramorgraphrepresentingfieldstrengthsorpowerdensitiesatvariousangularpositionsrelativetoanantenna.AUDENTECHNO.COM.AUDENTECHNO.COM.AUDENTECHNO.COM.Radiationpatternofadipoleantenna9090552450MHzE-Plane2450MHzE-Plane00-5-5-10-10-15-15-20-20-25-25-30-30-35-35-40-40-45-45180-50180-50Max=2.17dBiMax=2.17dBiAvg=2.17dBi270270AUDENTECHNO.COM.ANTENNAGAINTheratioofthepowerrequiredattheinputofaloss-freereferenceantennatothepowersuppliedtotheinputofthegivenantennatoproduce,inagivendirection,thesamefieldstrengthatthesamedistance.AUDENTECHNO.COM.ANTENNAGAINTheIndexoftheantennaperformance.AntennaGain(passive)0dBmAUDENTECHNO.COM.ANTENNAGAINH-PlaneE-PlaneFreq.(MHz)OpenCloseOpenCloseMaxAvg.MaxAvg.MaxMax880-1.26-2.27-3.88-4.56-3.05-5.01920-0.71-2.31-1.19-3.13-1.83
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