北斗与gps卫星用户天线和圆极化车载天线的研究

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1、AbstractⅢAbstractTheresearchworksarepresentedwithscientificprojects.Thethesisisdividedintotwoparts.Firstofall,adual-bandhighprecisionpositioningsatelliteuserantennaforBeidouNavigationSatelliteSystem(abbreviatedasBeidou)andGlobalPositioningSystem(abbreviatedasGPS)isdesignedandsimulated.Thedesi

2、ngedantennarealizeshighconsistencybetweenthephasecenterandthegeometriccenter.Secondly,accordingtothetechnicalrequirements,theengineeringsamplesofthewidebandcircularpolarizationantennaborneoncarwhichoperatesfromf0±50MHzisproposedandanalyzedindetail.Theproposedantennahas4％oftheopratingbandwidth

3、andrealizestheprojectrequirements.Theantennaprototypehasbeendeliveredtofirstpartytoused,andtheapplicationeffectisgood.Themaincontextscanbeillustratedasfollows:Firstly,inordertosatisfytheprojectrequirementsofthehighprecisionsatelliteuserantennaforBeidouandGPSsystems,adouble-layermicrostrippatc

4、hantennaisdesingedwhichemploysfoursymmetricalfeedingpoints,athickmediumsubstratewithlowdielectricconstantandtwofeedingnetworkshavingtwo-stagetwo-wayWilkinsonpowerdividerarepresentedbasedonthetheoryofdual-bandcircularlypolarizedmicrostripantenna.Thedesignedantennahastwofrequencybandswithitslow

5、frequencybandcovertheB3bandofBeidouandhighfrequencybandcovertheL1bandofGPSandB1bandofBeidou.Accordingtothesimulationoftheproposedantenna,fortherequiredfrequencyband,theVSWRislessthan1.4,thegainat90°inelevationisgreaterthan2.7dB.Intherangeof90°~24°inelevation,thegainisgreaterthan-5dB,andtheant

6、ennapatternroundnessislessthan1.5dB.TheARislessthan6dB,andconsistencyofthephasecenterandthegeometriccenterislessthan8mm.Thefront-to-rearisgreaterthan20dB.Thesimulatedresultsindicatethatthedesignedantennarealizeswidebeamcoverageonthehalf-spaceandrelativelyhighconsistencybetweenthephasecenteran

7、dthegeometriccenter.Secondly,theprojectrequirementsofthewidebandcircularpolarizationantennaborneoncarareillustrated.Inordertosatisfytheserequirements,amicrostrippatchantennaisproposedbasedontheoriesofwidebandcircularlypolarizedmicrostripanten