Three-Pole Tunable Filters With Constant Bandwidth Using Mixed Combline and Split-Ring Resonators

被引：35

作者：

Zhao, Zhiyuan ^{[1
]}

Chen, Jiang ^{[2
]}

Yang, Lin ^{[2
]}

Chen, Kunhe ^{[2
]}

机构：

[1] PLA Univ Sci & Technol, Inst Commun Engn, Nanjing 210007, Jiangsu, Peoples R China

[2] Nanjing Telecommun Technol Inst, Nanjing 210007, Jiangsu, Peoples R China

来源：

IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS | 2014年 / 24卷 / 10期

关键词：

Combline resonators; constant absolute bandwidth (CABW); split-ring resonators; three-pole tunable filters; varactor-tuned;

D O I：

10.1109/LMWC.2014.2340996

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 novel three-pole tunable bandpass filter using mixed varactor-tuned combline and split-ring resonators is proposed in this letter. A tuning range of 1.1-1.88 GHz (70.9%) with an almost constant 3 dB absolute bandwidth 90 +/- 8 of MHz (7.4%-4.4% fractional bandwidth) is demonstrated. The filter shows its insertion loss varying from 6.8 dB to 4.3 dB and return loss better than 13.5 dB within the tuning range. The rejection levels at both the lower and upper stopbands are >30 dB. The measured results show good agreement with the simulated ones.

引用

页码：671 / 673

页数：3