Bandpass filter using coupled-line-stub cascaded structure with high stopband rejection

被引：7

作者：

Lu, Sen ^{[1
]}

Xu, Kai-Da ^{[2
,3
]}

Guo, Yingjiang ^{[4
]}

Ren, Yi ^{[5
]}

Chen, Qiang ^{[3
]}

机构：

[1] Xiamen Univ, Dept Elect Sci, Xiamen, Peoples R China

[2] Xi An Jiao Tong Univ, Sch Informat & Commun Engn, Xian 710049, Peoples R China

[3] Tohoku Univ, Grad Sch Engn, Dept Commun Engn, Sendai, Miyagi, Japan

[4] China Acad Engn Phys, Microsyst & Terahertz Res Ctr, Chengdu, Peoples R China

[5] Chongqing Univ Posts & Telecommun, Sch Elect Engn, Chongqing, Peoples R China

来源：

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS | 2021年 / 63卷 / 01期

基金：

奥地利科学基金会;

关键词：

bandpass filter; coupled line; stopband rejection; transversal signal-interference technique; SIGNAL; DESIGN;

D O I：

10.1002/mop.32555

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 compact fifth-order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled-line-stub cascaded structure (CLS-CS). Based on transversal signal-interference technique, the CLS-CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3-dB fractional bandwidth of 39% (1.68-2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea.

引用

页码：69 / 74

页数：6

共 17 条

[1] High selectivity quarter-wavelength resonator bandpass filter utilizing source-load coupling [J].