microstrtip series arrays

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1、174IEEETRANSACTIONSONANTENNASANDPROPAGATION,VOL.AP-29,NO.1,JANUARY1981MFig.6.H-planeradiationpattern(38.4GHz).arrayindicatethatmismatcheswithinthemicrostripfeednet-sipationlosseswhichdecreasearrayefficiency.Further,inworkareresponsibleforthedegradedsidelobeandgainper-largearrayshigh-powerfeedli

2、nesaredecoupledfromelementsformance.Possiblesourcesofthesemismatchesaresubstrateradiatinglow-powerlevels.Thispermitstightercontrolofandetchingnonuniformity.aperturedistributions.Finally,steeredbeamscanbeeasilyachieved,andtheseriesconfigurationisparticularlyappli-SUMMARYANDCONCLUSIONcablewhenfre

3、quencyscanningisdesired.TheresultsofthisstudyareveryencouragingandshowtheInrecentyearsseveraltheoreticalmodelsformicrostripfeasibilityofthemicrostripantennaapproachatmillimeterseriesarrayshavebeendevelopedwhicharebasedoneitherwavefrequencies.Allresultspresentedwerefromactualwaveguide[I]orresona

4、ntcavityanalogiestothemicrostripmeasurementsperformedonfullscalemodelsat36.6,38.4,circuit.However,whenthesemodelsareappliedtopracticaland57.4GHz.designs,anomaliesareobservedinthemeasuredpatternssuchasincreasedsidelobesandunpredictablebeamposi-tions.Thiscommunicationdiscussestheproblemsencounter

5、edindesigningmicrostripseriesarrays,andpresentsanempiricaldesignapproachwhichcircumventscertainproblemsthatMicrostripSeriesArraysarenoteasilysolvedanalytically.11.DESIGNAPPROACHTHOMASMETZLERThemicrostripelementistypicallymodeledastworadiat-Absrracr-Atraveling-wavedesigntechniqueformicrostripser

6、iesingslotsformedbypatchedgediscontinuitiesinterconnectedarraysisdiscussed.Thetechniqueisapplicabletobothresonantandbyalow-impedancemicrostripline[2].Theradiationcon-nonresonantarrayconfigurations.Experimentalresultsforbothductanceiscalculatedfromtheequivalentslotwidth,andtheconfigurationsarepr

7、esented.susceptanceisthecomputedopen-circuitcapacitanceofthelow-impedanceline.I.INTRODUCTIONOurinitialworkattemptedtomodeltheseriesarrayascascadedelementsinterconnectedbyhigh-impedancelines.Seriesarrayconfigurationsofferuniqueadva