Ultra-wideband bandpass filter using hybrid quasi-lumped elements and defected ground structure

被引：2
|
作者：
Liu, Y. [1 ]
Liang, C. H. [1 ]
Wang, Y. J. [2 ]
机构：
[1] Xidian Univ, Natl Key Lab Antennas & Microwave Technol, Xian 710071, Peoples R China
[2] Xidian Univ, Natl Lab Radar Signal Proc, Xian 710071, Peoples R China
来源：
ELECTRONICS LETTERS | 2009年 / 45卷 / 17期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1049/el.2009.1364
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 planar microstrip ultra-wideband (UWB) bandpass filter is presented. The proposed UWB filter is realised by cascading a highpass filter (HPF) and a lowpass filter (LPF). Additional U-slot defected ground structure is adopted to improve the attenuation performance in the stop band. The HPF consists of inter-digital capacitors and a short-circuited stub. The LPF achieved by a hybrid microstrip and four backside slots on the ground plane is equivalent to a typical 9-pole stepped-impedance LPF. Combining these two structures, a new UWB bandpass filter is fabricated and measured. Measured results show that the proposed bandpass filter has a wide bandwidth from 3.1 to 11 GHz, and insertion loss is less than 1.2 dB over the most central passband. It also achieves a wide stop band with 20 dB attenuation up to 20 GHz.
引用
收藏
页码：899 / U58
页数：2
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