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1、波导滤波器设计,波导滤波器概述,波导滤波器具有插入损耗低、功率容量大和容易批量生产的特点；波导滤波器的工作频率可以达到毫米波波段。主要用于卫星通讯、电子对抗和雷达系统。波导滤波器有以下几种类型：直接耦合波导滤波器；交叉耦合波导滤波器；带抑制谐振器的波导滤波器；使用非谐振结点的波导滤波器；使用过模谐振器的波导滤波器；凋落模波导滤波器；,腔体级联耦合波导滤波器,对称膜片,纵向条带,方柱,横向条带,圆柱,矩形波导滤波器常见类型,波导滤波器设计举例,设计参数：f0 = 15.35 GHz BW= 32 MHzS11 -20 dB S21 -40 dB f0 40 MHz滤波器从 14.9到 15.35
2、 GHz连续可调,BJ-140波导技术参数：a=15.8mm;b=7.9mm;工作频率范围：11.918GHz,滤波器原型,1a)Obtain low-pass prototype parameters (gi) from filter specifications (see e.g. Matthaei*),f0 BW IL RL,*Matthaei, Young and Jones “Microwave filters, impedance-matching networks, and coupling structures”, Artech House, Norwood, MA, 1992
3、,带K变换器滤波器模型,1b)Calculate K-inverters (band-pass prototype parameters),Example:K01=0.0775K12=0.0048K23=0.0034K34=0.0032,K变换器的S参数,在滤波器中心工作频率,K变换器计算模型,利用对称面可以简化模型；计算K值；计算附加相移；,优化耦合系数,For all couplings: Optimize coupling to give the right K-inverter value at the center frequency,优化谐振腔长度,For all resonato
4、rs: calculate resonator length, fine tune until the structure resonates at the center frequency,Denne figuren er IKKE for frste resonator,resonator lengthl1 = 10.839 mml2 = 11.346 mml3 = 11.395 mml4 = 11.395 mml5 = 11.346 mml6 = 10.839 mm,滤波器测试结果,Designed at 15.35 GHzTunable from 14.9 to 15.35 GHzMeasured at 15.32 GHz,data centered on f0,仿真与测试结果比较,
