内嵌式双频滤波器的-研究

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1、AbstractTheexistingsinglechannelsignalhasnotbeenabletomeettheneedsofmoderncommunicationanditisreplacedbydualchannelsignalgraduallybecauseoftherapiddevelopmentofwirelesscommunicationsysteminrecentyears.AsthemaindeviceoftheRF(radiofrequency)communicationsystem,filteralsoneedtobecomeintothedualband

2、-passfilter.Aimattherequest,thedualband-passfiltersarestudiedinthispaperandmainlybasedonembeddedstructure.Comparedwiththetraditionalseries-parallelfilters,couplingmatrixsynthesisandtwo-moderesonancemethod,theembeddedfiltersbringtheconveniencetodesignbecausetheyhavetheadvantagesofsmallsize,simple

3、design,don’thavetoconsiderthecouplingcoefficientbetweenthetwobandpassandsoon.ThefirstfilterinthispaperisbasedonahalfwavelengthofSIR(SteppedImpedanceResonators)structure.Firstly,thetwopairsofCSIRaredesignedandcontroldifferentcenterfrequencyofthetwofiltersrespectively.Secondly,thedualband-passfilt

4、erappliedtoWLANisrealizedbyembeddingthesmallersizeSIRwhichcontrolthehighfrequencyoffilterintothebiggersizeSIRwhichcontrolthelowfrequencyoffilter.Abroadbandembeddeddual-bandfilterisdesignedandsimulatedinchapterfive.Themainsolutionisletthecouplingelementsofbandpassfilterisloadedwiththebandstopelem

5、entsinordertosplitoneultra-bandpassintotwo.Accordingtothismethodadual-bandpassfilterwiththecenterfrequencies2.6/5.2GHzissimulatedbyADSandthesimulationresultsiswell.Sothismethodisprovedbytheeffectivefeasible.Keywords:Dualband-passfilterSteppedimpedanceresonatorUltra-bandpassfilterStubfilter目录第一章绪

6、论................................................................................................................11.1双频带滤波器研究的背景和意义...................................................................11.2双频段滤波器实现方法..................................................................................21

7、.3本论文的主要工作..........................................................................................4第二章散射参量与微带线.........................................................................................52.1散射参量的定义............