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[注]：濾波器向?qū)軌驇椭阍O(shè)計出初步滿足條件的各類濾波器，在此基礎(chǔ)上，加上具體設(shè)計要求（通帶或阻帶TheMicrowaveOfficeFilterWizardisafiltersynthesisplug-inapplicationthataccessesthesimulationroutinesofMWOthroughastandardCOM/APIinterface.UsingtheFilterWizard,youcansynthesizeBandpass,Bandstop,HighpassandLowpassfiltersoftransmissionresponseapproximationsincludingButterworth,Chebyshev,andBessel-Thomson.（響在設(shè)計界面的左下方“project”按鈕的最下方選“Wizards”你可以看到畫面：點擊下一步：上面的圖形非常形象的給你提供可選擇的各類濾波器。TherearefourbroadcategoriLowpassHighpassBandpassBandstop(alsocalledBand-rejectorNotch).Youselectoneofthesetransmissionresponseshapeswhenyoubeginthewizard.選取你所需要設(shè)計的類型及可再點擊下一步開始向?qū)гO(shè)計。你可進(jìn)一步根據(jù)需要選擇濾波器的類型：MWOsupportsthefollowingapproximationsinthisrelease:Butterworth(MaximallyFlatMagnitude)-representsacompromisebetweenhighselectivityandflatChebyshev(EqualRipplePassbandMagnitude)-achieveshighselectivitlossattheexpenseofgroupBessel-Thomson(MaximallyFlatGroupDelay)-achievesmaximallyflatpassbandgroupdelay,butsuffersfrompoorselectivity.每種響應(yīng)的特性如上。確定后繼續(xù)下一步：TheParameterSpecificationswindowcontrolstheattenuationresponse.Theseparametersinclude:inaBandpassorBandstopfilter.□BandEdge(s)-edgesofthefrequencybandtowhichthePassbandParameterValueapplies.□PassbandParameter-choiceofReturnLoss,Ripple,RippleFactor,VSWR,ReflectionCoefficientandMaximumAttenuation.□PassbandParameterValue-numericalminimumormaximumoftheselectedPassbandParameter.thefilter'sinputandoutputportsareattached.Selectingthefiltertechnology選好后就可以進(jìn)入下一個設(shè)計畫面了：ThefollowingfiguresshowtheFilterTechnologywindowforthesupportedfiltertechnologies.注意并非所有的模型都支持上述響應(yīng)。比如對于低通濾波器就只能選取第一種，下面的材料選取同樣。Onlyoptionsforcurrentlyavailabletechnologiesareselectable.LowpassFilterTechnologyCurrently,Lowpassfiltcircuitasshowninthefollowi選擇其一，就可進(jìn)入下一步設(shè)計。只能選分立元件的原因是上面選擇“idealElectricMode”造成的。如果你設(shè)計的是微帶線器件，前面就要選其它類型的，比如“ShuntstubTransmissionLine”等。這個選擇框問你想使用串行“Series”，還是使用并行Lumped-ElementLowpassPrototypesAlosslessLumped-ElementLowpassprototypeisareciprocaltwo-portnetworkwithalowpassattenuationimpedance,RL[RL=RSinButterworth,Bessel,andodd-orderChebychevprototypes,while,foreven-orprototypecanberealizedasaladdernetworkconsistingoflosslessshuntcapacitorsandseriesinvertercoupledshuntcapacitors.設(shè)置好后，就可以進(jìn)入綜合輸出畫面了：這個畫面給出了可以提供的各種輸出，你按需求打鉤就大功告成了。這個畫面綜述了你整個設(shè)計過程的基本設(shè)置。點擊完成就進(jìn)入了工程畫面，打開電路圖窗口，選“WindowsTileVertical”排好窗口，再點擊分析按鈕，OK！Generally,thespacingbetweenthearmsofthehairpinismaderelativeltwoendsofahairpinresonatorareeitherbothopen-circuited,orbothgrounded.Consequently,unlikeinterdigitalandcomblineresonators,youneednotgroundhairpinresonators.Adjacenthairpinresonatorstypicallyhavetheirendsfacinginoppositedirections,inaninterdigitalfashion.Interdigitalresonatorsarequarter-wavetransmissionlineresonatorsarrangedparalleltooneanother,groundedononeend,andopen-circuitedontheother.Adjacentresonatorshaveoppositeendsgrounded.arecapacitivelyloadedattheother(open-circuited)end.Adjacentlesssymmetrictransmissioncharacteristic(withmoreattenuationonthehigherfrequenlessattenuationonthelowerfrequencyside).ShuntStubTransmissionLineresonatorsareattachedtoeachotherattheirungroundedendsbyquarterwavelengthconnectingtransmissionlinesections.Half-WaveParallel-Coupled-LineResonators（半波波長耦合微帶傳輸線）Parallel-coupled-lineresonatorsareahalfwavelengthlongandstraight,withquarterwavelengthportionscoupledtoadjacentresonators.Thetwoendsoftheresonatorsareeitherbothopen-circuitedorbothgrounded.Consequently,unlikeinterdigitalandcomblineresonators,youneednotgroundparallel-coupled-lineresonators.Whenyouchooseatransmissifabricationtechnologyasshowninthefollowingfigure.懸著了微帶類型的傳輸線，你需要進(jìn)一步定義基板的工藝參數(shù)：微帶濾波器設(shè)計最常見的問題及處理方法：***************************************W/H不滿足條件是微帶濾波器設(shè)計最常見的錯誤，應(yīng)為軟件過分強(qiáng)調(diào)器件性能而忽視了理論模型（近視場解）的基本條件。最直接的方法是先犧牲部分性能，將不滿足條件的變量寬高比強(qiáng)制限定到要求內(nèi)。從板材選取處可以看到，高度為那么你應(yīng)當(dāng)確保所有W的變量下限:A）嚴(yán)格大于*=B）最好大于如果違法規(guī)則A，優(yōu)化中止?應(yīng)為模型已經(jīng)不成立了；如違反規(guī)則B，設(shè)計出來的器件在實際制作后性能有明顯差異。按A或B改好初值和下限后，就可以在點擊“分析”按鈕了。的