提出了一种基于电磁带隙结构的低通滤波器实现形式,这种新型低通滤波器采用电容周期性加载共面(Coplanar Waveguide)传输线结构的形式.为了减小通带内波纹、显著提高阻带信号抑制,电容单周期性加载结构被调整为电容双周期性加载结构,同时在共面传输线的接地面上引入了双周期性的长方形缺陷地结构.基于上述方案设计制作了一个高温超导低通滤波器,仿真及测试结果表明:低通滤波器的带外抑制平均增加了约20 dB,带内传输损耗波纹显著变小.
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