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低频矢量网络分析仪的设计的综述报告AbstractAlowfrequencyvectornetworkanalyzer(LFVNA)isanelectronicinstrumentthatisdesignedtoperformmeasurementsofelectricsignalsoflowfrequencies.Thisdeviceisusefulinapplicationswhereitisessentialtodeterminethecompositionofelectricfields.Inthisreviewpaper,wewillexaminethegeneraldesignandfunctionalityofLFVNA,andwewilldiscussthevarioustypes,advantages,anddisadvantagesofthisinstrument.IntroductionTraditionally,vectornetworkanalyzers(VNAs)havebeenusedinhighfrequencyapplicationsfortestingcomponentssuchasfilters,amplifiers,andantennas.TheyweredesignedtomeasuresignalsthattypicallyrangedfromMHztoGHzfrequencyrange.However,thereisaneedforthemeasurementofsignalsatlowerfrequencies.Thisiswherethelow-frequencyvectornetworkanalyzercomesintoplay.AnLFVNAisanelectronicinstrumentthatisdesignedtoperformmeasurementsofelectricsignalsoflowfrequencies.DesignandFunctionalityThedesignofanLFVNAissimilartothatofahigh-frequencyVNA,butithassomemodificationstodealwiththelowerfrequencyrange.ThemaincomponentsofanLFVNAincludeasignalgenerator,directionalcouplers,phaseshifters,anddetectors.Thesignalgeneratorisusedtoprovidetheinputsignaltothedeviceundertest(DUT).Directionalcouplersareusedtoseparatetheforwardandreversewaves.Phaseshiftersareusedtoadjustthephaseofthesourcesignal,whichisneededforaccuratemeasurements.ThedetectorsareusedtomeasurethesignalthatisreflectedortransmittedbytheDUT.TypesofLFVNATherearetwotypesofLFVNA:thesweptfrequencytypeandthebroadbandtype.1.SweptFrequencyLFVNATheswept-frequencyLFVNAemploysthesamemethodasthatusedinhigh-frequencyVNA.Thistypeofanalyzerhasanarrowfrequencyrange,anditsmainlimitationistheslowsweeprate.Advantages:-Lowcost-SimplicityindesignDisadvantages:-Limitedtonarrowfrequencyranges-Itssweeprateisrelativelyslower2.BroadbandLFVNAThebroadbandLFVNAisalsoknownasthetime-domainreflectometry(TDR)analyzer.Thistypeofanalyzerhasabroadfrequencyrangeandhighsweeprates.Thisdevicecanbeusedtomeasurethetime-domainresponseofaDUT.Advantages:-Highsweeprate
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