FEKO航空行业应用案例.pdf

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1、ELECTROMAGNETICSIMULATION:ThebenefitforthedesignofEWsystemsBennieJacobs4May2011LittleCrowEWconferenceTABLEOFCONTENTSIntroductionBackgroundElectromagneticsimulationValidationofmodelAntennaplacementstudiesDirectionFindingConclusionINTRODUCTIONAntennascanberegardedastheeyes,ears

2、andmouthfEW(ElhofanEW(ElectroniWf)icWarfare)systemBuiltin-houseorboughtascomponentsPerformanceoftheantennameasuredunderPerformanceoftheantennameasuredunderideal“ideal”freespaceconditions.Whenantennasaremountedonplatformstheidealpatternsaredisturbed.Platformcaninducepatternrip

3、plescausedbyreflections,diffractions,shadowingandunequalperffformanceforVVandHdHpollariizattiions,ettc.Inthepastfullscaleorscalemodelmeasurementsweretypicallymadetodetermineperformanceoftheinstalledantennas.INTRODUCTIONTheincreaseincomputationalpowerandEMmethodsmakepossibleth

4、euseofelectromagneticsimulationCompleteplatformcanbemodelledwithelectromagneticsimulationSimulationcanbeusedtodetermineoptimallocationonplatformSimulationcanbeusedtogeneratecalibrationtablesforDFElectromagneticsimulationcanthereforebeverybeneficialtothedesignofEWsystemsbyredu

5、cingdevelopmenttime,riskandtheassociatedcosts.BACKGROUND:ScalemodelmeasurementsIfthelineardimensionsaredecreasedbyn,thefrequencymustbibeincreasedbhfdbythefactornForexampleifweworkwitha1:25scale,ascaledantennathatoperateat100MHzfullscalemustbemeasuredat2.5GHzForhighfrequencies

6、itquicklybecomesimpossibletousescalemodels,e.g.10GHzbecomes250GHz…Scalemodelmustbephysicallyandelectricallyidenticaltothefullscaleitem.BACKGROUND:Scalemodelmeasurements:InterferometerDFandbladeantennaplacement,Boeing707Initialstudiesdoneonbasicscaledandfullscalemodels(cylinde

7、rwithendcaps)CompleteBoeing707modelconstructedinaluminumwithbuilderskit(1:25scale)asreferenceMaxwell’sequationsBACKGROUND:ElectromagneticsimulationInfofromFEKOwebsite(http://www.feko.info/)MaxwellBACKGROUND:Electromagneticsimulation:FEKOExampleofantennaplacementandRCSInfofrom

8、FEKOwebsite(http://wwwfekoinfo/)InfofromFEKOwebsite(http://www.feko.