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1、ABSTRACTABSTRACTTheapplicationofwhipantennasinHFcommunicationismoreandmorewide.Theminiaturizationandbroadbandareaninevitabletrend.ThisthesisisbasedonFinite-differenceTime-domain(FDTD)method,andthedesignofbroadbandandminiaturizedhigh-performancewhipantennaisresearc
2、hed.Thethin-wireapproximatemodelofthewhipantennaispresentedandtheequivalentvoltagesourceisintroduced.Aloadedwhipantennaanditsmatchingnetworkareanalyzedandoptimized.Inthisthesis,whentheantennaisdesigned,thegain,bandwidthandefficiencyaretakenintoaccount,andGeneticAl
3、gorithm(GA)isusedtooptimizethehighperformanceantenna.Theresearchworkofthewhipantennaislisted.1.Startingfromthebasicprincipleoftheelectromagneticfield,Maxwell’scurlequationsaredifferenced,andtheFDTDmethodinthepolarcoordinatesisusedtosimulateantennas.Thesemi-analyti
4、calandsemi-numericalthin-wireapproximationisappliedtothenearfieldsaroundtheantenna,whichimprovescomputationalefficiency.Anequivalentvoltagesourceisintroducedtoreducethecomputationalspace.ThenthelumpedelementFDTDformatisintroduced,andtheFDTDsimulationisrealized.Res
5、istivelyloadedantennasandcapacitivelyloadedantennasareanalyzedwiththismethod.2.Theintegratedtechnologyisused,withtheloadedelementandmatchingnetwork.
TakingintoaccountthepropertiesofGA,thejointofFDTDandGAsimulationis
realized,andtheloadedelementvaluesandlocationare
6、optimized.Lumpedloading
improvestheantennaradiationsituationtosomeextent,butitdoesnotexpandthe
bandwidthverywell.Thebandwidth,efficiencyandotherfactorsareconsidered,and
thenthematchingnetworkisoptimized.Finally,abroadbandandminiaturized
high-performancewhipantenna
7、isoptimizedanddesigned.Keywords:whipantenna,Finite-differenceTime-domain(FDTD),thin-wireapproximation,GeneticAlgorithms,matchingnetworkII目录目录第一章绪论..................................................................................................................1
1.
8、1研究背景及意义....................................................................................................1
1.2国内研究现状.................................
