An UWB Bandpass Filter Based on a Novel Type of Multi-Mode Resonator
An UWB Bandpass Filter Based on a Novel Type of Multi-Mode Resonator
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DOI：
10.1109/lmwc.2012.2218229
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发表时间：
2012-10-01
影响因子：
3
通讯作者：
Xiao, Fei
中科院分区：
文献类型：
--
作者：
Zhang, Zhongxun;Xiao, Fei
本文提出了一种新型多模谐振器（MMR），该谐振器由级联叉指耦合微带线段和加载的短端阶梯阻抗短截线构成。建立并分析了其传输线模型，表明其存在七个谐振。最后，设计、制造并测量了基于此类MMR的超宽带滤波器。测量结果表明，该滤波器具有尖锐的裙边，带外抑制电平高达40 dB。同时，回波损耗优于17 dB。群延迟在通带内也是平坦的。
A novel type of multi-mode resonator (MMR) is proposed in this letter, which is constructed by cascading interdigital coupled microstrip line sections with short-ended stepped impedance stubs being loaded. Its transmission line model is set up and analyzed, which shows that it has seven resonances. Finally, an ultra-wideband filter based on this type of MMR is designed, fabricated and measured. The measured results show that the filter has a sharp skirt and an out-of-band rejection level as good as 40 dB. Meanwhile, return loss is better than 17 dB. Group delay is also flat in the passband.