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ID:36411227
大小:8.02 MB
页数:83页
时间:2019-05-10
《GSMR频段微带带通滤波器的研究与设计》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、北京交通大学硕士学位论文GSM-R频段微带带通滤波器的研究与设计姓名:张晓燕申请学位级别:硕士专业:通信与信息系统指导教师:周克生20080601关键词:GSM—R频段;微带带通滤波器;准椭圆函数;耦合系数矩阵;小型化;交指电容加载谐振器分类号:j匕塞交通太堂亟±堂垡j金塞一△曼墨!B△£至ABSTRACTFiltersplayveryimportantrolesinmanyRF/microwaveapplications.Emergingapplicationssuchaswirelesscommunicationscontinuetochal
2、lengeRF/microwavefilterswithevermorestringentrequirements--higherperformance,smallersize,lighterweightandlowercost.·Thispaperpresentsthedesignofaclassofmiorostripbandpassquasi—ellipticfunctionfilterswimthebandwidthof4MHzandthefractionalbandwidth3、attenuationpolesatfinitefrequencies.Becauseoftheseattenuationpolesatfinitefrequencies,quasi—ellipticfunctionfiltersperformancehigherselectivityandsharperfilterskirtthanChebyshevones.Thistypeoffilters,whichconsistofthecrosscouplingmicrostripopen-loopresonators,Cannotonlyreduce4、thedifficultyoffabrication,butalsoresultinacompacttopology.Thelocationsoftwofmitcfrequencyattenuationpolesofthequasi·ellipticfunctionbandpaSSfiltersareat883.4MHzand890.6MHzwhosecenterfrequencyis887MHzorat928.4MHzand935.6MHzwhosecenterfrequencyis932MHz.Theseplanarstructuresofm5、iorostripban@a8squasi—ellipticfunctionfiltershavebeenstudiedanddesignedinthispaperonaccountofthereasonabove.However,theexistingnarrow-bandmicrostripfiltersforfractionalbandwidth<1%aredifficulttofabricatedonconventionalsubstrates,becausemiorostripcannotevenformacompletepassban6、d.Inthispaper,thefilterisrealizedusingtheconfigurationbased011thefull-waveEMandfabricatedusingacoppermicrostripOilansubstrate、加marelativedielectricconstantof10.8andathicknessof1.27mm.Onthebasisofthefiltersabove,akindofslow-wavefiltersconsistofcapacitiveloadedopen-loopresonato7、rsaredesigned.Thenovelfilterisnotonlymorecompactinsizebutalsohavewiderstop—band.Atlast,thepefformancesofthesefiltersaremeasuredbyHP8270Dvectornetworkanalyzer.Themeasuredresultsshowthatthiskindofmiorostripban@assfiltersarecharacterizedhighlyselectiveandnarrowbandwidthwithasing8、lepairofattenuationpolesatfmitcfrequencies.Butinsertlossofthefabrica
3、attenuationpolesatfinitefrequencies.Becauseoftheseattenuationpolesatfinitefrequencies,quasi—ellipticfunctionfiltersperformancehigherselectivityandsharperfilterskirtthanChebyshevones.Thistypeoffilters,whichconsistofthecrosscouplingmicrostripopen-loopresonators,Cannotonlyreduce
4、thedifficultyoffabrication,butalsoresultinacompacttopology.Thelocationsoftwofmitcfrequencyattenuationpolesofthequasi·ellipticfunctionbandpaSSfiltersareat883.4MHzand890.6MHzwhosecenterfrequencyis887MHzorat928.4MHzand935.6MHzwhosecenterfrequencyis932MHz.Theseplanarstructuresofm
5、iorostripban@a8squasi—ellipticfunctionfiltershavebeenstudiedanddesignedinthispaperonaccountofthereasonabove.However,theexistingnarrow-bandmicrostripfiltersforfractionalbandwidth<1%aredifficulttofabricatedonconventionalsubstrates,becausemiorostripcannotevenformacompletepassban
6、d.Inthispaper,thefilterisrealizedusingtheconfigurationbased011thefull-waveEMandfabricatedusingacoppermicrostripOilansubstrate、加marelativedielectricconstantof10.8andathicknessof1.27mm.Onthebasisofthefiltersabove,akindofslow-wavefiltersconsistofcapacitiveloadedopen-loopresonato
7、rsaredesigned.Thenovelfilterisnotonlymorecompactinsizebutalsohavewiderstop—band.Atlast,thepefformancesofthesefiltersaremeasuredbyHP8270Dvectornetworkanalyzer.Themeasuredresultsshowthatthiskindofmiorostripban@assfiltersarecharacterizedhighlyselectiveandnarrowbandwidthwithasing
8、lepairofattenuationpolesatfmitcfrequencies.Butinsertlossofthefabrica
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