A Dual-Wideband Balanced Bandpass Filter Based on Branch-Line Structure With Controllable Common-Mode Suppression

被引：0
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作者：
Ren, Baoping [1 ,2 ]
Liu, Xinlei [1 ]
Guan, Xuehui [1 ]
Xu, Mengrou [1 ]
Zhang, Zhi-Chong [3 ]
机构：
[1] School of Information Engineering, East China Jiaotong University, Nanchang, China
[2] State Key Laboratory of Millimeter Waves, Southeast University, Nanjing, China
[3] School of Electronics and Information Engineering, Jinggangshan University, Ji’an, China
来源：
Frontiers in Physics | 2021年 / 9卷
基金：
中国国家自然科学基金;
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摘要：
In this paper, a novel dual-wideband balanced bandpass filter (BPF) based on branch-line structure is proposed. For analysis, the equivalent circuits of differential-mode (DM) and common-mode (CM) of the filter are built based on the even- and odd-mode method. With a proper synthesis design of DM bisection, dual passbands with a multi-order filtering response can be obtained. Additionally, three open-circuited stubs are centrally loaded on the CM bisection and six controllable transmission zeros are therefore generated. Thus, two stopbands are formed and then a favorable CM suppression within DM passbands is obtained. For demonstration, a third-order dual-wideband balanced BPF is designed with two passbands operating at 2.54 and 4.62 GHz. Good agreement between the simulated results and measured results is obtained, which verifies the validity of the proposed design method. © Copyright © 2021 Ren, Liu, Guan, Xu and Zhang.
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