High Selectivity Dual-Band Balanced BPF With Controllable Passbands Based on Magnetically Coupled Capacitor-Loaded SIRs

被引：9
作者：
Liu, Xinlei [1 ]
Ren, Baoping [2 ,3 ]
Guan, Xuehui [1 ]
Wang, Jinlong [1 ]
Wan, Shaopeng [1 ]
机构：
[1] East China Jiaotong Univ, Sch Informat Engn, Nanchang 330013, Peoples R China
[2] East China Jiaotong Univ, Sch Informat Engn, Nanchang 330013, Peoples R China
[3] Southeast Univ Nanjing, State Key Lab Millimeter Waves, Nanjing 210096, Peoples R China
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2023年 / 70卷 / 09期
基金：
美国国家科学基金会;
关键词：
Balanced bandpass filter (BPF); dual-band; capacitor-loaded stepped-impedance resonators (CL-SIRs); common-mode (CM) suppression; magnetic coupling; FILTER; RESONATORS;
D O I：
10.1109/TCSII.2023.3271152
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In this brief, a novel capacitor-loaded stepped-impedance resonators (CL-SIRs) is proposed and adopted to construct dual-band balanced bandpass filter (BPF) with controllable passbands. The differential mode (DM) and common mode (CM) characteristics of the CL-SIRs are discussed in detail, and two DM resonant frequencies that can be independently controlled are selected to design the desired dual DM passbands. A novel dual-frequency feeding structure is proposed to not only independently control the external quality factors of the two DM passbands but also suppress the unwanted harmonics of DM bisection. Furthermore, a intrinsic high CM suppression is achieved by utilizing the magnetically coupled scheme. Also, multiple transmission zeros are generated because of the introduced source-loaded coupling, which highly improved the selectivity of two DM passbands. For verification, a dual-band balanced BPF operated at 2.5 GHz and 3.5 GHz is designed and fabricated. The measured results agree well with the simulated results, and the filter exhibits the attractive features of design flexibility, wide-stopband, high selectivity, and favorable CM suppression.
引用
收藏
页码：3293 / 3297
页数：5
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