An UWB Bandpass Filter Based on a Novel Type of Multi-Mode Resonator

Author

Zhang, Zhongxun ; Xiao, Fei

Author_Institution

Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

22

Issue

10

fYear

2012

Firstpage

506

Lastpage

508

Abstract

A novel type of multi-mode resonator (MMR) is proposed in this letter, which is constructed by cascading interdigital coupled microstrip line sections with short-ended stepped impedance stubs being loaded. Its transmission line model is set up and analyzed, which shows that it has seven resonances. Finally, an ultra-wideband filter based on this type of MMR is designed, fabricated and measured. The measured results show that the filter has a sharp skirt and an out-of-band rejection level as good as 40 dB. Meanwhile, return loss is better than 17 dB. Group delay is also flat in the passband.

Keywords

band-pass filters; microstrip lines; resonator filters; MMR; UWB bandpass filter; group delay; interdigital coupled microstrip line; multimode resonator; return loss; short-ended stepped impedance stubs; transmission line model; ultra-wideband filter; Equivalent circuits; Filtering theory; Impedance; Resonant frequency; Transmission line measurements; Ultra wideband technology; Wireless communication; Multi-mode resonator (MMR); transmission zero; ultra-wideband (UWB) filter;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2012.2218229

Filename

6310081