天线参数介绍

RadiationPattern&ERP&Sensitivity1ContentsAntennaRadiationPatternChamberEIRPSensitivity2AntennasDefinition:Adevicedesignedforradiating(orreceiving)electromagneticenergy.(IEEE)3DipoleAntennaACλ/4λ/445MonopoleAntennagroundImageantennaActualantennaλ/4λ/46PolarizationLinear：VerticalHorizontalCircular：RCHLCH7V.S.W.RV.S.W.R：電壓駐波比駐波比所表示者，為負載阻抗與特性阻抗間，不相匹配的程度。當負載完全匹配時，S.W.R之值為1，是為實際上無從取得的最佳理想狀態。VSWR與Gain之間為相對關係，而非絕對關係。8V.S.W.RLoadingSignalPiPrPo9IsotropicAntenna“Isotropic” Havingthesamepropertiesinalldirections.Definition：Anantennacapableofradiatingorreceivingequallywellinalldirections,andequallyresponsivetoallpolarizationsofelectricand/ormagneticfields.10GainRadiatedbyIsotropicAnt.IsotropicAnt.GiGi

：絕對增益(dBi)DipoleAnt.Gd

：相對增益(dBd)GdRadiatedbyDipoleAnt.RadiatedbyDipoleAnt.2.15dBRadiatedbyotherAnt.Gd=Gi

–2.15(dB)11RadiationPatternDefinition:Thespatialdistributionofaquantitythatcharacterizestheelectromagneticfieldsradiatedbyanantenna.Apolardiagramorgraphrepresentingfieldstrengthsorpowerdensitiesatvariousangularpositionsrelativetoanantenna.1213Radiationpatternofadipoleantenna14151617

Auden’sFarFieldInstrumentationDUT-ReceiverandTurnTableAnechoicChamberHD2000ESControllerHP8720ESMeasurementworkstationandSoftwareTxsourceAntenna1M~2.6M18EffectiveIsotropicRadiationPower

(EIRP)Definition:Theequivalentisotropicallyradiatedpowerofatransmitter(withantenna,transmissionline,duplexersetc.)isthepowerthatwouldbenecessaryattheinputterminalsofareferenceisotropicradiatorinordertoproducethesamemaximumfieldintensity.Anisotropicradiatorisatheoreticallosslesspointsourceofradiationwithunitygaininalldirections.EIRPisusuallycalculatedbymultiplyingthemeasuredtransmitteroutputpowerbythespecifiedantennasystemgain,relativetoanisotropicradiator,inthedirectionofinterest.(FCCCFR47§22.99)19EIRP(實際輻射功率) =天線輸入端的功率×天線的增益(W)

EIRP=ANTENNAGAIN+POWER(dBm)20SensitivityDefinition:Theratioofthemagnitudeofadeviceresponse,e.g.,voltage,tothemagnitudeofthequantifymeasured,e.g.,fieldstrengthsquared.21GSM&DCS&PCSPOWER：GSM：33dBmDCS：30dBmPCS：30dBm22GSMTX975880.201890.2038897.6062902.40124914.80RX975925.201935.2038942.6062947.40124959.80DCSTX5121710.207001747.808851784.80RX5121805.20700