Design of Wideband Bandpass Filter with Equal-Ripple Attenuation in the Passband
Design of Wideband Bandpass Filter with Equal-Ripple Attenuation in the Passband
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DOI：
10.1109/iwem53379.2021.9790591
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Pin Wen;Zhewang Ma;Shuangshuang Zhu;Fan Liu;M. Ohira
中科院分区：
文献类型：
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作者：
Pin Wen;Zhewang Ma;Shuangshuang Zhu;Fan Liu;M. Ohira
本文提出了一种采用三段耦合线的宽带带通滤波器。通过在宽带带通滤波器的对称平面上加载开路短截线，在通带内产生了7个谐振模式，获得了等波纹衰减特性。此外，耦合线和一对短路短截线在宽带带通滤波器的截止频率附近引入了三对对称传输零点，提高了滤波器的选择性和带外衰减性能。为了验证的目的，宽带带通滤波器的覆盖较低的UWB频带（带宽：2.3-4.9 GHz，FBW：74%）的设计。
In this paper, a wideband bandpass filter (BPF) is presented using three sections coupled-lines. By loading an open-circuit stub at the symmetrical plane of the wideband bandpass filter, seven resonant modes are generated in the passband, and the equal-ripple attenuation characteristic is obtained. Moreover, the proposed coupled-lines and a pair of short-circuit stubs introduces three pairs of symmetrical transmission zeros at around the cutoff frequencies of the wideband BPF, which improves the performances of selectivity and out-of-band attenuation. For validation the purposes, a wideband bandpass filter covering the lower UWB band (BW: 2.3-4.9 GHz, FBW: 74%) is designed.