滤波器设计向导

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1、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,HighpassandLowpassfilt

2、ers（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：上面的图形非常形象的给你提供可选择的各类滤波器。Therearefourbroadcategoriesthattransmissionresponseshaperequirementstypicallyfallunder:Lowpass

3、HighpassBandpassBandstop(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:Butterworth(MaximallyFlatMagnitude)-representsacompromisebetweenhighselectivit

4、yandflatgroupdelay.Chebyshev(EqualRipplePassbandMagnitude)-achieveshighselectivitywithlowpassbandinsertionlossattheexpenseofgroupdelayflatness.Bessel-Thomson(MaximallyFlatGroupDelay)-achievesmaximallyflatpassbandgroupdelay,butsuffersfrompoorselectivity.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

5、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(s)-edgesofthefrequencybandtowhichthePassbandParameterVa

6、lueapplies.□PassbandParameter-choiceofReturnLoss,Ripple,RippleFactor,VSWR,ReflectionCoefficientandMaximumAttenuation.□PassbandParameterValue-numericalminimumormaximumoftheselectedPassbandParameter.□SourceandLoadImpedances-equivalentresistancesofthegenerator(source)andloadtowhichthefilter'sinput

7、andoutputportsareattached.Selectingthefiltertechnology选好后就可以进入下一个设计画面了：ThefollowingfiguresshowtheFilterTechnologywindowforthesupportedfiltertechnologies.注意并非所有的模型都支持上述响应。比如对于低通滤波器就只能选取第一种，下面的材料选取同样。Onlyoptionsforcurrentlyavailable