微波仿真论坛_网络分析仪基础.pdf

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1、网络分析仪基础刘迪应用工程师安捷伦科技2008年1月7日B.O.X.-RFFundamentalSeminarPage12008/1/91目录•什么是网络分析仪？–史密斯圆图&散射参数–高频器件特性–什么是网络分析仪•网络分析仪硬件结构–网络分析仪内部框图–激励源IncidentTransmittedDUT–信号分离装置ReflectedSOURCE–接收机SIGNALSEPARATION–显示处理单元REFLECTEDTRANSMITTEDINCIDENT(R)(A)(B)•网络分析仪测试校准技术RECEIVER/DETECTOR–网络分析仪测量误差分析PROCESSOR/DISPLAY

2、–校准方法–双端口校准–TRL校准–电子校准件•网络分析仪产品纵览Port1EXPort2–典型测量应用S21ETTb2A–ENA系列射频网络分析仪a1ESEDS11S22a2–PNA系列微波网络分析仪AAb1ELERTS12AB.O.X.-RFFundamentalSeminarPage22008/1/9Inthissectionwewillreviewreflectionandtransmissionmeasurements.WewillseethattransmissionlinesareneededtoconveyRFandmicrowaveenergyfromonepointto

3、anotherwithminimalloss,thattransmissionlineshaveacharacteristicimpedance,andthataterminationattheendofatransmissionlinemustmatchthecharacteristicimpedanceofthelinetopreventlossofenergyduetoreflections.WewillseehowtheSmithchartsimplifiestheprocessofconvertingreflectiondatatothecompleximpedanceofthe

4、termination.Fortransmissionmeasurements,wewilldiscussnotonlysimplegainandlossbutdistortionintroducedbylineardevices.WewillintroduceS-parametersandexplainwhytheyareusedinsteadofh-,y-,orz-parametersatRFandmicrowavefrequencies.2射频微波信号在器件中的传播棱镜入射传输反射什么是网络分析光信号???器件反射射频信号传输入射入射B.O.X.-RFFundamentalSemin

5、arPage32008/1/9Thephysicalmodelthatunderlieshigh-frequencynetworkanalysisisbasedontransmitted,incidentandreflectedelectromagneticwavestravelingalongtransmissionlines.Itissometimeshelpfultothinkofalightwaveanalogy.Wecanimagineincidentlightstrikinganopticalcomponentsuchasalens.Someofthelightisreflec

6、tedoffthesurfaceofthelens,butmostofthelightcontinuesonthroughthelens.Ifthelensismadeofalossymaterial,thenaportionofthelightwillbeabsorbedwithinthelens.Ifthelenshadmirroredsurfaces,thenmostofthelightwouldbereflectedandlittle(ornone)wouldbetransmittedthroughthelens.ThisbasicconceptisalsovalidforRFan

7、dmicrowavesignals,exceptthatourcomponentsareelectricaldevicesandnetworksinsteadoflensesandmirrors.Networkanalysisisconcernedwiththeaccuratemeasurementoftheratiosofthereflectedsignaltotheincidentsignal,andthetrans