High Selectivity Balanced Bandpass Filter with Tunable Bandwidth Using Stub-Loaded Resonator

被引：2
|
作者：
Ma, Yalin [1 ,2 ]
Che, Wenquan [1 ]
Chen, Jianxin [3 ]
Feng, Wenjie [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Dept Commun Engn, Nanjing 210094, Jiangsu, Peoples R China
[2] Huaiyin Inst Technol, Fac Math & Phys, Huaian 223001, Jiangsu, Peoples R China
[3] Nantong Univ, Sch Elect & Informat, Nan Tong 226019, Jiangsu, Peoples R China
来源：
PROGRESS IN ELECTROMAGNETICS RESEARCH LETTERS | 2015年 / 55卷
基金：
中国国家自然科学基金;
关键词：
D O I：
10.2528/PIERL15052804
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：
A new balanced bandpass filter (BPF) with tunable bandwidth using tri-mode stub-loaded resonators is proposed. To tune the differential-mode bandwidth, the two even-mode resonance frequencies and two transmission zeros (TZs) are tuned while the odd-mode resonance frequency keeps unchanged. To realize high selectivity for differential mode, another two TZs are created by the source-load coupling and coupling sections. Furthermore, wideband common-mode (CM) suppression is achieved. The fabricated filter has 3-dB fractional bandwidth ranging from 20.0% to 26.0% centered at 1.71 GHz and wideband suppression (17 dB from 2 to 4.4 GHz) for the differential mode, as well as common-mode suppression better than 20 dB from 0 to 4.5 GHz.
引用
收藏
页码：89 / 95
页数：7
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