High Performance Balanced Bandpass Filters With Wideband Common Mode Suppression

被引：34
作者：
Feng, Wenjie [1 ,2 ,3 ]
Pan, Bosang [1 ]
Zhu, Haoshen [1 ]
Zhou, Xin Yu [4 ]
Che, Wenquan [1 ]
Xue, Quan [1 ]
机构：
[1] South China Univ Technol, Sch Elect & Informat Engn, Guangzhou 510006, Peoples R China
[2] Nanjing Univ Sci & Technol, Dept Commun Engn, Nanjing 210094, Peoples R China
[3] Pazhou Lab, Guangzhou 510330, Peoples R China
[4] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA
来源：
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS | 2021年 / 68卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Band-pass filters; Filtering theory; Resonator filters; Optical ring resonators; Equivalent circuits; Impedance; Passband; Balanced bandpass filter; compact; common mode (CM) rejection; double-sided parallel-strip line (DSPSL); high selectivity; SPLIT RING RESONATORS; AUTOMATED DESIGN;
D O I：
10.1109/TCSII.2020.3044092
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：
Two compact and high selectivity balanced bandpass filters with excellent common mode rejection are designed in this brief. Compared with the half-wavelength microstrip transmission line, 180 degrees phase shift is realized by two small swap structures, which are composed by double-sided parallel-strip line (DSPSL), and this way can easily realize a wideband common mode rejection with compact circuit size. Two out-of-band transmission zeros are introduced by the dual-mode ring resonator in the first proposed structure; thus, high selectivity can be achieved. In the second filter, shorted/open coupled microstrip lines are added between the dual-mode ring resonator and 180 degrees swap structure, two additional transmission zeros can be achieved. Finally, two prototypes center at 2.2 GHz are fabricated, and the measured 3-dB bandwidths for the differential mode are 23.6% and 11.8%, respectively.
引用
收藏
页码：1897 / 1901
页数：5
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