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基于双面平行带线的绝对带宽不变频率可调带通滤波器

Keywords: 双面平行带线,绝对带宽不变,频率可调,带通滤波器,电容加载

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Abstract:

提出基于双面平行带线结构的电容加载绝对带宽不变频率可调平面带通滤波器,通过选取特定的耦合区域,使谐振器之间耦合系数满足绝对带宽不变的要求.分别设计了工作在单端信号和差模信号下的滤波器.结果表明,对于单端信号滤波器,其3dB绝对带宽(|S11|<-3dB)在0.97~1.43GHz的中心频率调节范围内约为80±4MHz;对于差模信号滤波器,其3dB绝对带宽(|Sdd11|<-3dB)约为91±3MHz,对共模噪声的抑制低于-20dB.

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