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MLFMA分析复杂载体平台上天线问题
Introduction
Inmoderntimes,therehasbeenahugeincreaseintheusageofcomplexcarrierplatformslikeships,aircraft,tanks,andothersuchvehiclesforcommunicationpurposes.Inordertofacilitateeffectivecommunication,antennasareinstalledontheseplatforms.However,theinstallationofantennasoncomplexcarrierplatformsgivesrisetovariousissuesthathindertheperformanceoftheantennas.TheuseoftheMethodofMoments(MoM)iscommonfortheanalysisofantennas.However,whenMoMisusedfortheanalysisofantennasoncomplexcarrierplatforms,itcanbequitetime-consumingandcomplex.ThisiswheretheMethodofMoments--MultilevelFastMultipoleAlgorithm(MLFMA)comesintoplay.Inthispaper,wewillanalyzetheissuesofantennaplacementoncomplexcarrierplatformsandhowtheMLFMAmethodcanbeusedtoresolvetheseissues.
AntennaPlacementIssues
Thereareseveralissuesthatarisewhenantennasareinstalledoncomplexcarrierplatforms.Thefirstandforemostissueistheeffectoftheplatformontheradiationpatternoftheantenna.Thepresenceoftheplatformcancausethedirectivityoftheantennatochange,resultinginlowerperformance.Secondly,thepresenceoftheplatformcancausethecreationofreflections,whichcancauseinterferenceinthetransmissionandreceptionofsignals.Finally,thepresenceoftheplatformcanalsocausethecreationofshadowing,wheretheplatformobstructsthepropagationofsignals.
Methodology
TheMLFMAmethodisbasedontheuseoftheMethodofMoments(MoM)whichisusedfortheanalysisofantennas.TheMLFMAmethodisusedfortheefficientandaccurateanalysisofantennasoncomplexcarrierplatforms.Themethodisbasedonthepartitioningoftheantennasintoasetofsub-domainsandtheuseoftheFastMultipoleMethod(FMM)torapidlyevaluatetheinteractionsbetweenthesesub-domains.TheFMMreducesthecomplexityoftheproblembyclusteringfar-fieldinteractionsintomultipoleexpansions,whichcanbeefficientlyevaluated.
Results
TheanalysisofantennasoncomplexcarrierplatformsusingtheMLFMAmethodhasshowntobeeffectiveinresolvingtheissuesofantennaplacement.TheMLFMAmethodhasbeenusedfortheanalysisofantennasonaircraft,ships,andtanks,andhasshownsignificantimpr