ku波段上变频器的研制

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1、ABSTRACTABSTRACTUp-converterforthetransmissionlinkisanimportantpart.Up-converterwhichmakesuseofthefrequencyspectrumofnonlineardevicechangestheIFsignaltotheRFsignal.Andthenthesignalthroughthepoweramplifierwillbelaunchedout.DuetotherapiddevelopmentofChina'ssatellitecommunicatio

2、ns,people’srequirementforspectrumresourceisnotlimitedtothelowfrequencyband.Forexample,UHFbandandC-band.Ku-bandshowsmanycharacteristicssuchaslargecommunicationcapacity,smallexternalinterferenceandhighantennagain.Therefore,researchersathomeandabroadpaymuchattentiontotheKu-band.

3、ThepapergivesadetaileddesignprocessandtestmethodsfortheKu-bandup-converterandpresentsthreenovelcompactmicrostripfilters.Themainworksofthispaperareasfollows:1.Todevelopprograms.AccordingtothetechnicalrequirementsoftheKu-bandup-converter,systemdesignprogramwillbeobtainedafterca

4、refulanalysis.Inthedesignofup-converterconsideringtheproblemsneedingattentionsuchasportisolationimagerejectionandself-excited.Dependingonthedevelopedprograms,budgetanalysisaboutgainofthelevelsandnoisefactorfortheentirelinkisshown.Gain,noisefactorandVSWRofentirelinkaresimulate

5、dusingADSsoftware.2.ThedevelopmentoftheKu-bandup-converter.Designofthesystemtheunitcircuitiscompletedincludingpassivecircuit,conversionandamplificationcircuitandaDCpowersupplycircuit.Passivecircuitmainlyreferstothedesignofimagerejectionmicrostripfilter.Whichfrequencyconversio

6、nandamplificationcircuitfocusesonisselectingtheIFamplifier,RFamplifier,LOamplifierandmixer.1dBcompressionpointandgainareconsideredforselectingchips.DCpowersupplycircuitisprimarilyresponsibleforsupplyingpowerforthechips.3.Designoffilters.Hairpinimagerejectionmicrostripfilteris

7、designed.Proposingthreenovelcompactmicrostripfilterssuchascross-coupledmicrostripfilter,T-sectionloadeddual-modedual-bandmicrostripfilterandthestubsloadedtri-modemicrostripfilter.Theoreticalanalysisandsimulationtestsoffiltersareshownindetail.TheseII万方数据ABSTRACTfiltershavemany

8、advantagessuchascompactstructure,smallsizeandgoodbandrejection.These