新型开环谐振器带通滤波器的设计

14320086()JOURNALOFSHANGHAIUNIVERSITY(NATURALSCIENCE)Vo.l14No.3Jun.2008:20070403:(1970~),,,,.Emai:[e-mail]:10072861(2008)03023603江新华,李国辉(,200072):,,.,,,.,30%.:;;;:TN713+.5:ADesignofBandPassFilterwithNovelOpenLoopResonatorsJIANGXinhua,LIGuohui(SchoolofCommunicationandInformationEngineering,ShanghaiUniversity,Shanghai200072,China)Abstract:Inthispaper,severalsquareopenloopresonatorswithtransmissionlinesareproposedtodesignoptimizedbandpassfilters.Incomparisonwithconventionalopenloopresonatorbandpassfilters,theproposedfiltercanachievesizereduction.Acompactmicrostripfilterusingoneoftheseopenloopresonatorsisfabricatedandmeasured.Simulationandmeasurementonthefabricatedfiltershowhighfrequencyselectivityandgoodstopbandcharacteristicwithsmalldimensions.Comparedwithconventionalfiltersusingcoupledsquareopenloopresonators,theproposedfilterhasasizereductionof30%.Keywords:miniaturization;bandpassfilter;openloopresonator;microstrip,,[16].[1],,,.Jordi(CSRR),.,[23].,(PBG)[4](DGS)[5].Zhang[6],.,,.,,,,,.,30%,..11.11(a)~(c).,.(1(d)),,,.,.14,4,2.1.802.022.262.56GHz.,,.14Fig.1Fourdifferentresonators24Fig.2Returnlossforfourresonators[7],3.ABCD,:a0=2arctan1f0ZaCL,(1)a1=2-2arctan(f1ZaCL),(2)(1)(2),a0a1,CL,f0f1;,f1/f0[7]..3Fig.3Capacitivelyloadedtransmissionlineresonator1.2,1(a).2.8,0.8mm,4(a).,1(d)4(b).(a)(b)4Fig.4Geometryoftwotypesoffilters,:a=12mm,b=12mm,w=2mm,n=2mm,m=0.4mm,k=0.2mm,s=0.2mm,p=1mm.2sonnet4ab2373,:.,1.1Tab.1Characteristicsoftwotypesoffiltersabf0/GHz1.802.56S21max/dB-70-14.4/(dBGHz-1)64.710.6BW20dB/GHz1.501f0,S21max,BW20dB20dB.[8]=!min-!maxfs-fc,(3),!min20dB,!max3dB,fc3dB,fs20dB.,S21max20dB,,!min=14.4dB.S5.15,1.80GHz,3dB1.761.85GHz,3dB5%,0.1dB.,2.56GHz1.80GHz,30%.3.1GHz,.,,20dB2.0GHz3.5GHz..6.(Agilent8722ES)(5),[S],[M].,.,.33,3,5%,0.1dB,.5SFig.5Simulatedandmeasuredofthefilterresponses6Fig.6Fabricatedfilter,2.56GHz1.80GHz,30%.,,.,.:[1]HSUCL,HSUFC,KUOJT.MicrostripbandpassfiltersforUltraWideband(UWB)wirelesscommunications[C]//MicrowaveSymposiumDigest,IEEEMTTSInternationa.l2005:679682.[2]BONACHEJ,MARTINF,FALCONEF,eta.lApplicationofcomplementarysplitringresonatorstothedesignofcompactnarrowbandpassstructuresinmicrostriptechnology[J].MicrowOptTechLett,2005,46(5):508511.[3]GARCAGARCAJ,MARTINF,FALCONEF,eta.lMicrowavefilterswithimprovedstopbandbasedonsubwavelengthresonators[J].IEEEMTT,2005,53(6):19972006.[4]FALCONEF,LOPETEGIF.Compactphotonicbandgapmicrostripstructure[J].MicrowOptTechLett,1999,23(4):233236.(下转第243页)238()14.,.,.4,,.,..:[1]TAREMS,BRESSLERS,HARELA,eta.lDetectorcontrolsystemfortheATLASmuonendcaptrigger[J].NuclearScience,2005,52:12071211.[2],,,.[J].,2006(8):122124.[3]KLIMCHYNSKII.ExtensibleembeddedwebserverarchitectureforInternetbaseddataacquisitionandcontrol[J].SensorsJourna,l2006,6:804811.[4].AVR[J].,2005(9):149151.[5],,.ATmega8[M].:,2003:65189.[6].ZNE100PT[R].2000.[7],,,.[J].,2007(3):625630.[8],EAGLEL,.AVRC[M].:,2006:382388.[9]BARNETTR,OCULLL,COXS.CAtmelAVR[M].:,2003:105126.(编辑:赵宇)(上接第238页)[5]PARKJI,YUNJ,DALA.Designofthenovelcoupledlinebandpassfilterusingdefectedgroundstructurewithwidestopbandperformance[J].IEEEMTT,2002,50(9):20372043.[6]ZHANGXY,CHENJX,QUANX.Compactpassbandfilterusingopenloopresonatorswithcapactiveloading[J].MicrowOptTechLett,2007,49(1):8384.[7]HONGJS,LANCASTERMJ.MicrostripfiltersorRF/microwaveapplications[M].NewYork:JohnWiley&Sons,2001:392396.[8]KARMAKERNC.Improvedperformanceofphotonicbandgapmicrostriplinestructureswiththeuseofchebyshevdistributions[J].MicrowOptTechLett,2002,33(1):15.(编辑:赵宇)2433,: