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DesignandImplementationofLTCCFilterswithHighStopbandRejection Yong-ShengDai1,Bao-ShanLi1,Zhong-HuaYe1,De-LongLu2，Chao-YuWang1,Zhi-DongSong1,FeiWang1 1.NanjingUniversityofScienceandTechnology210094 2.ZhejiangZhengyuanElectricCO.LTD Email:daiyongsheng@21cn.com Abstract-Aminiaturizedandhighstopbandrejectionbandpassfilter(BPF)withthreefinitetransmissionzerosisproposedinthispaper.TheBPFwithacentralfrequencyof3.4GHzand200MHzbandwidthisimplementedinanoveldistributedstriplineconfigurationusingLTCCtechnology.Adistinctfeatureofthisfilterisexcellentout-of-bandattenuationperformance.Thelowerskirtofthepassbandisverysteep.Thereis36.5dBattenuationin3.2GHz.WeemployZ-shapelayertoproducethelower2transmissionzeros.Byproperlycontrollingthecorss-couplingbetweenthesecondandthefourthresonator,transmissionzeroinhigherskirtofthepassbandwillappear.Measurementresultsofmassproductionareshowntomatchwellwiththeelectromagneticsimulation,whichvalidatetheproposedstructure.Theoverallsizeofthefilteris4.8mm×4.2mm×1.5mm. IndexTerms—Bandpassfilter,low-temperaturecofiredceramic(LTCC),highstopbandrejection,cross-coupling INTRODUCTION Inrecentyears,thewirelesscommunicationindustryhascomeunderincreasingdemandstomakecommunicationsystemslighter,morecompactandportable,withbetterfunctionality.OneeffectivemethodofmakingsmallRFcomponentsistoutilizemultilayersubstratessuchaslowtemperatureco-firedceramic(LTCC).LTCCisawidelyusedmutilayertechnologyforRFpassivecomponentsduetothe3-Dintegrationcapability,processtolerance,andhigh-unloadedqualityfactor.AdvantagesofmicrowavefiltersandduplexersrealizedasmultilayerintegratedcircuitsbasedonLTCCarecompactsize,highermanufacturability,andlowcost. Thebandpassfilter(BPF)isoneofthemostimportantpassivecomponentsforRFcircuitsandsystems.Agoodbandpassfilterhaslowinsertionlossinthepassbandandprovideshighout-of-bandattenuationthroughtheincorporationofmultipletransmissionzeros.Bandpassfilterswithtransmissionzerosatfinitefrequenciesseemveryattractiveforduplexerapplications,especiallywhe