Compact UWB Bandpass Filter With Improved Upper-Stopband Performance
Compact UWB Bandpass Filter With Improved Upper-Stopband Performance
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DOI：
10.1109/lmwc.2008.2008558
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发表时间：
2009
影响因子：
3
通讯作者：
B. Yao;Yonggang Zhou;Q. Cao;Yinchao Chen
中科院分区：
文献类型：
--
作者：
B. Yao;Yonggang Zhou;Q. Cao;Yinchao Chen
本文研究并实现了一种新型的超宽带（UWB）带通滤波器，该滤波器采用多模谐振器（MMR）结构，具有体积小、上阻带性能好的特点。MMR是由三对圆形阻抗阶梯短截线并联在一个高阻抗微带线上形成的。通过简单地调整短截线的圆的半径，MMR的谐振模式可以大致分配在3.1-10.6 GHz UWB频带内，同时抑制上阻带中的杂散谐波。为了提高耦合度，在输入输出端采用了两条叉指耦合线。因此，实现了预测的UWB通带。同时，在12.1 ~ 27.8GHz的上阻带内，插入损耗大于30.0dB。最后，成功地设计并制作了滤波器。EM模拟和测量结果在这项工作中，它们之间获得了很好的协议。
In this letter, a novel ultra-wideband (UWB) bandpass filter with compact size and improved upper-stopband performance has been studied and implemented using multiple-mode resonator (MMR). The MMR is formed by attaching three pairs of circular impedance-stepped stubs in shunt to a high impedance microstrip line. By simply adjusting the radius of the circles of the stubs, the resonant modes of the MMR can be roughly allocated within the 3.1-10.6 GHz UWB band while suppressing the spurious harmonics in the upper-stopband. In order to enhance the coupling degree, two interdigital coupled-lines are used in the input and output sides. Thus, a predicted UWB passband is realized. Meanwhile, the insertion loss is higher than 30.0 dB in the upper-stopband from 12.1 to 27.8 GHz. Finally, the filter is successfully designed and fabricated. The EM-simulated and the measured results are presented in this work where excellent agreement between them is obtained.