一种高频带通LC滤波器的设计方法

486Vo.l48No.620086TelecommunicationEngineeringJune2008:1001-893X(2008)06-0082-04一种高频带通LC滤波器的设计方法*周兰飞1,王璟2,张玲2(1.,610036;2.,610036):以带通滤波器的基本电路为例,对电路中通常存在的缺陷和可能造成的问题进行了分析,着重介绍了一种采用网络变换对电路进行优化并合理利用极点放置技术的经济高效设计方法,并通过试验证明了采用该电路构造滤波器的可行性和优点:带通滤波器;LC滤波器;网络变换;极点放置技术;设计:TN713:AADesignMethodofHighFrequencyBandPassLCFilterZHOULan-fei1,WANGJing2,ZHANGLing2(1.ChengduSpaceonElectronicsCo.,Ltd.,Chengdu610036,China;2.SouthwestChinaInstituteofElectronicTechnology,Chengdu610036,China)Abstract:Bytakingthebasiccircuitofbandpassfliterasanexample,thecommondrawbacksandprob-lemsofcircuitsareanalysed,andaneconomicandhighefficientdesignmethodusingoptimizedcircuitisintroducedbynetworktransformandpoleplacementtechnique.Thefeasibilityandadvantagetoconstructfiltersisprovedthroughexperimen.tKeywords:bandpassfilter;LCfilter;networktransform;polepalcementtechnique;design1,LC,,,,,,STEF42-200MHzLC,,,2STEF42-200MHz:(1):200MHz;(2)-3dB:30MHz;(3):2dB;(4)1:f040MHz,40dB;(5)2:f=235MHz,50dB;(6):-55~85;(7):50:,,82*:2008-01-19;:2008-04-11486Vo.l48No.620086TelecommunicationEngineeringJune20082.1,,,,2.2,,,,:,,,,,,2.3-55~85,,LC:(1)0805,;(2)31.51.5,,33.1:ncosh-1100.1As-1/100.1Ap-1cos-1s(1),As;Ap;ss,:f0=fLfH(2),fL;fH3.2,1111L1L2L3L4C1C2C3C4207nH4.4nH455nH3.7nH3.0pF145pF1.4pF170pF1,,,200MHz,,50~300nH,,;,LCQ,L1C1L3C3,,,3.322:83486Vo.l48No.620086TelecommunicationEngineeringJune2008C1=(n-1)Cn(3)C2=Cn(4)C3=(1-n)Cn2(5),,,,33,,n1=6.87,n2=0.098,n3=11.14422L1L2L3L4C1C2C3C4C5C6C6C8207.5nH207.67nH206.33nH209.54nH2.63pf0.45pf2.14pf0.61pf5.57pf5.62pf0.56pf2.03pf2,207nH,,,3.4,4,55:L1=(fH-fL)R2fLf2M-f2Lf2M-f2H(6)C1=12(fH-fL)Rf2M-f2Lf2M-f2H(7)L2=Rf2M-f2Lf2M-f2HfL+fH(8)C2=14RfL+fHf2M-f2Lf2M-f2H(9),R;fL;fH;fM,:R=Z(n1n2ni)2(10),Z,ni3.5ni,,6684486Vo.l48No.620086TelecommunicationEngineeringJune200833L1L2L3L4L5C1C2C3C4C5C6C7C8C9207nH207nH206nH295nH502nH2.6pF0.45pF2.14pF0.61pF5.57pF5.62pF0.56pF1.79pF0.91pF4,,,44-55+85-3dB30MHz35MHz37MHz36MHz35MHz2dB1.3dB1.4dB1.1dB1.5dBf040MHz40dB43dB58dB46dB61dB44dB63dB45dB63dBf=235MHz50dB57dB60dB63dB62dB4,,-55~+85,,:[1].LC[M].:,2005.[2],.[M].:,1977.:(1978-),,,LC,()[e-mail];璟(1981-),,,;(1981-),,,85