滤波器设计向导教学教材.doc

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1、滤波器设计向导精品文档滤波器设计向导[注]：滤波器向导能够帮助你设计出初步满足条件的各类滤波器，在此基础上，加上具体设计要求（通带或阻带特性的优化目标），就可以快速完成特定期间的设计。TheMicrowaveOfficeFilterWizardisafiltersynthesisplug-inapplicationthataccessesthesimulationroutinesofMWOthroughastandardCOM/APIinterface.UsingtheFilterWizard,youcansynthesizeBandpass,Bandstop,Highpassand

2、Lowpassfilters（带通、带阻、高通和低通）utilizingavarietyoftransmissionresponseapproximationsincludingButterworth,Chebyshev,andBessel-Thomson.（响应类型）进入向导：在设计界面的左下方“project”按钮的最下方选“Wizards”你可以看到画面：点击下一步：收集于网络，如有侵权请联系管理员删除精品文档上面的图形非常形象的给你提供可选择的各类滤波器。Therearefourbroadcategoriesthattransmissionresponseshaperequi

3、rementstypicallyfallunder:LowpassHighpassBandpassBandstop(alsocalledBand-rejectorNotch).Youselectoneofthesetransmissionresponseshapeswhenyoubeginthewizard.选取你所需要设计的类型及可再点击下一步开始向导设计。你可进一步根据需要选择滤波器的类型：MWOsupportsthefollowingapproximationsinthisrelease:收集于网络，如有侵权请联系管理员删除精品文档Butterworth(MaximallyFl

4、atMagnitude)-representsacompromisebetweenhighselectivityandflatgroupdelay.Chebyshev(EqualRipplePassbandMagnitude)-achieveshighselectivitywithlowpassbandinsertionlossattheexpenseofgroupdelayflatness.Bessel-Thomson(MaximallyFlatGroupDelay)-achievesmaximallyflatpassbandgroupdelay,butsuffersfrompoo

5、rselectivity.每种响应的特性如上。确定后继续下一步：这个画面要求你设定滤波器的级数（根据实际上升沿的陡度定，取大些比较保险）、带内参数（波动幅度）、端口及负载阻抗等。TheParameterSpecificationswindowcontrolstheattenuationresponse.Theseparametersinclude:□Filterorder-thenumberofreactancesinaLowpassorHighpassfilter,andnumberofresonatorsinaBandpassorBandstopfilter.□BandEdge(

6、s)-edgesofthefrequencybandtowhichthePassbandParameterValueapplies.□PassbandParameter-choiceofReturnLoss,Ripple,RippleFactor,VSWR,ReflectionCoefficientandMaximumAttenuation.□PassbandParameterValue-numericalminimumormaximumoftheselectedPassbandParameter.□SourceandLoadImpedances-equivalentresistan

7、cesofthegenerator(source)andloadtowhichthefilter'sinputandoutputportsareattached.Selectingthefiltertechnology收集于网络，如有侵权请联系管理员删除精品文档选好后就可以进入下一个设计画面了：ThefollowingfiguresshowtheFilterTechnologywindowforthesupportedfiltertechnologies.