几种滤波器与天线的集成设计

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1、AbstractAbstractWiththerapiddevelopmentofwirelesscommunicationsandelectronictechnology,electronicdevicesarerequiredtomeetvariousspecificationsforthewirelesscommunicationsystem.Thisrequiresfiltersandantennas,twomostimportantpartsofthesystem,tobeintegrated.Thisthesisismainlyconcernedwiththeinte

2、grateddesignoffiltersandantennas.Theauthor'smaincontributionscanbesummarizedasfollows:1.Combinedwithafilterusingmicrostripsplit-ringresonator,amonopolefilter-antennaisproposed.Theoperatingfrequenciesofthemonopoleantennaarefrom3.1GHzto10.6GHz,andthoseofthefilterare7.75-8.3GHz.Byintroducinganim

3、pedancetransformerbetweentheantennaandthefilter,thedeteriorationcausedbytheimpedancemismatchingcanbeeliminated,andthentheperformanceofthefilter-antennacanbeenhanced.Thereflectioncoefficientcharacteristicsofthefilter-antennawithdifferentarmlengthsandfeedinglinewidthsareanalyzed,withotherparame

4、tersfixed.Theeffectoftheimpedancetransformerisalsodiscussed.Theproposedfilter-antennahasbeenfabricatedandmeasured.Themeasuredresultsagreepreferablywiththesimulatedresults.2.Ahalf-wavedipolefilter-antennacombinedwithaSIWfilterforWLAN5GHzapplicationispresented.Theoperatingfrequenciesofthedipole

5、arefrom4.5GHzto5.5GHz,andthoseofthefilterare4.75-5.25GHz.Twodifferentfeedstructures,thecouplingstructureandthebalanceddual-linestructure,areutilizedforfindingabetterperformance.Consideringconvenientcombinationwiththefilter,thebalanceddual-linestructureisused.Then,thedesignstepsofanevanescentm

6、odefilterarepresented.Finally,thefilter-antennaisimplementedandfabricated.Themeasuredresultsagreepreferablywiththesimulatedresults.Keywords:Filter-antennaMonopoleantennaMicrostripopenloopfilterAHalf-waveDipoleEvanescentmodefilter目录目录第一章绪论.......................................................

7、..............................................................11.1研究背景及意义................................................................................................11.2国内外研究现状..............................................................