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ID:29728793
大小:789.50 KB
页数:3页
时间:2018-12-22
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1、DesignandImplementationofLTCCFilterswithHighStopbandRejectionYong-ShengDai1,Bao-ShanLi1,Zhong-HuaYe1,De-LongLu2,Chao-YuWang1,Zhi-DongSong1,FeiWang11.NanjingUniversityofScienceandTechnology2100942.ZhejiangZhengyuanElectricCO.LTDEmail:daiyongsheng@21cn.comAbstract-Aminiaturizedandhigh
2、stopbandrejectionbandpassfilter(BPF)withthreefinitetransmissionzerosisproposedinthispaper.TheBPFwithacentralfrequencyof3.4GHzand200MHzbandwidthisimplementedinanoveldistributedstriplineconfigurationusingLTCCtechnology.Adistinctfeatureofthisfilterisexcellentout-of-bandattenuationperfo
3、rmance.Thelowerskirtofthepassbandisverysteep.Thereis36.5dBattenuationin3.2GHz.WeemployZ-shapelayertoproducethelower2transmissionzeros.Byproperlycontrollingthecorss-couplingbetweenthesecondandthefourthresonator,transmissionzeroinhigherskirtofthepassbandwillappear.Measurementresultsof
4、massproductionareshowntomatchwellwiththeelectromagneticsimulation,whichvalidatetheproposedstructure.Theoverallsizeofthefilteris4.8mm×4.2mm×1.5mm.IndexTerms—Bandpassfilter,low-temperaturecofiredceramic(LTCC),highstopbandrejection,cross-couplingI.INTRODUCTIONInrecentyears,thewirelessc
5、ommunicationindustryhascomeunderincreasingdemandstomakecommunicationsystemslighter,morecompactandportable,withbetterfunctionality.OneeffectivemethodofmakingsmallRFcomponentsistoutilizemultilayersubstratessuchaslowtemperatureco-firedceramic(LTCC).LTCCisawidelyusedmutilayertechnologyf
6、orRFpassivecomponentsduetothe3-Dintegrationcapability,processtolerance,andhigh-unloadedqualityfactor.AdvantagesofmicrowavefiltersandduplexersrealizedasmultilayerintegratedcircuitsbasedonLTCCarecompactsize,highermanufacturability,andlowcost.Thebandpassfilter(BPF)isoneofthemostimporta
7、ntpassivecomponentsforRFcircuitsandsystems.Agoodbandpassfilterhaslowinsertionlossinthepassbandandprovideshighout-of-bandattenuationthroughtheincorporationofmultipletransmissionzeros.Bandpassfilterswithtransmissionzerosatfinitefrequenciesseemveryattractiveforduplexerapplications,espe
8、ciallywhentheguardb
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