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1、天线参数介绍第1页,共23页,编辑于2022年,星期五ContentsnAntennanRadiation PatternnChambernEIRPnSensitivity2第2页,共23页,编辑于2022年,星期五AntennasnDefinition:qA device designed for radiating(or receiving)electromagnetic energy.(IEEE)3第3页,共23页,编辑于2022年,星期五Dipole AntennaAC/4/44第4页,共23页,编辑于2022年,星期五5第5页,共23页,编辑于2022年,星期五Monopole An
2、tennagroundImage antennaActual antenna/4/46第6页,共23页,编辑于2022年,星期五PolarizationnLinear:qVerticalqHorizontalnCircular:qRCHqLCH7第7页,共23页,编辑于2022年,星期五V.S.W.RnV.S.W.R:電壓駐波比q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。qVSWR與Gain之間為相對關係,而非絕對關係。8第8页,共23页,编辑于2022年,星期五V.S.W.RLoadingSignalPiP
3、rPo9第9页,共23页,编辑于2022年,星期五Isotropic Antennan“Isotropic”qHaving the same properties in all directions.nDefinition:qAn antenna capable of radiating or receiving equally well in all directions,and equally responsive to all polarizations of electric and/or magnetic fields.10第10页,共23页,编辑于2022年,星期五GainRadi
4、ated by Isotropic Ant.Isotropic Ant.GiGi:絕對增益(dBi)Dipole Ant.Gd:相對增益(dBd)GdRadiated by Dipole Ant.Radiated by Dipole Ant.2.15dBRadiated by other Ant.Gd=Gi 2.15(dB)11第11页,共23页,编辑于2022年,星期五Radiation PatternnDefinition:qThe spatial distribution of a quantity that characterizes the electromagnetic field
5、s radiated by an antenna.qA polar diagram or graph representing field strengths or power densities at various angular positions relative to an antenna.12第12页,共23页,编辑于2022年,星期五13第13页,共23页,编辑于2022年,星期五Radiation pattern of a dipole antenna14第14页,共23页,编辑于2022年,星期五15第15页,共23页,编辑于2022年,星期五16第16页,共23页,编辑于2
6、022年,星期五17第17页,共23页,编辑于2022年,星期五 Audens Far Field InstrumentationDUT-Receiver and Turn TableAnechoic ChamberHD 2000ES ControllerHP 8720ESMeasurement workstation and SoftwareTx source Antenna1M2.6M18第18页,共23页,编辑于2022年,星期五 Effective Isotropic Radiation Power(EIRP)nDefinition:qThe equivalent isotropica
7、lly radiated power of a transmitter(with antenna,transmission line,duplexers etc.)is the power that would be necessary at the input terminals of a reference isotropic radiator in order to produce the same maximum field intensity.An isotropic radiator is a theoretical lossless point source of radiati
8、on with unity gain in all directions.EIRP is usually calculated by multiplying the measured transmitter output power by the specified antenna system gain,relative to an isotropic radiator,in the direction of interest.(FCC CFR47 22.99)19第19页,共23页,编辑于2022年,星期五nEIRP(實際輻射功率)=天線輸入端的功率 天線的增益(W)nEIRP =ANTE
9、NNA GAIN+POWER(dBm)20第20页,共23页,编辑于2022年,星期五SensitivitynDefinition:qThe ratio of the magnitude of a device response,e.g.,voltage,to the magnitude of the quantify measured,e.g.,field strength squared.21第21页,共23页,编辑于2022年,星期五GSM&DCS&PCSPOWER:GSM:33 dBmDCS:30 dBmPCS:30 dBm22第22页,共23页,编辑于2022年,星期五GSMTX975880.20 1890.20 38897.60 62902.40 124914.80 RX975925.20 1935.20 38942.60 62947.40 124959.80 DCSTX5121710.20 7001747.80 8851784.80 RX5121805.20 7001842.80 8851879.80 GSM-PCSTX5121850.20 6601879.80 8101909.80 RX5121930.20 6601959.80 8101989.80 GSM&DCS&PCS23第23页,共23页,编辑于2022年,星期五
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