Design of a Microstrip UWB Bandpass Filter Having Sharp Attenuations and Wide Stopbands

Author

Watanabe, Koji ; Zhewang Ma ; Chen, Chun-Ping ; Anada, Tetsuo ; Masayuki, Kato ; Kobayashi, Yoshio

Author_Institution

Grad. Sch. of Sci. & Eng., Saitama Univ., Saitama

fYear

2008

fDate

10-12 Sept. 2008

Firstpage

391

Lastpage

395

Abstract

In this paper, a novel ultra-wideband (UWB) bandpass filter having a midband frequency of 4.1 GHz and a fractional bandwidth of 34.1% is designed with a combined use of a microstrip stub-loaded dual-mode ring resonator and parallel-coupled step-impedance two-mode resonators. Advantages of both the stub-loaded ring resonator and the step-impedance two-mode resonator are exploited, and the UWB filter shows sharp attenuations near the passband and very wide stopbands. The frequency response of the filter meets quite well Japan´s low-band limit for UWB applications.

Keywords

band-pass filters; microstrip filters; microstrip resonators; microwave filters; network synthesis; resonator filters; ultra wideband technology; filter design; frequency 4.1 GHz; frequency response; microstrip UWB bandpass filter; parallel-coupled resonator; step-impedance two-mode resonator; stub-loaded dual-mode ring resonator; ultra-wideband bandpass filter; Attenuation; Band pass filters; Bandwidth; Frequency; Microstrip filters; Microstrip resonators; Optical ring resonators; Passband; Resonator filters; Ultra wideband technology;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2008 China-Japan Joint

Conference_Location

Shanghai

Print_ISBN

978-1-4244-3821-1

Type

conf

DOI

10.1109/CJMW.2008.4772453

Filename

4772453