Compact UWB Bandpass Filter With Ultra Narrow Notched Band

Author

Luo, Xun ; Ma, Jian-Guo ; Ma, Kaixue ; Yeo, Kiat Seng

Author_Institution

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

Volume

20

Issue

3

fYear

2010

fDate

3/1/2010 12:00:00 AM

Firstpage

145

Lastpage

147

Abstract

A compact ultra-wideband (UWB) bandpass filter with an ultra narrow notched band is proposed using a hybrid microstrip and coplanar waveguide (CPW) structure. The CPW detached-mode resonator (DMR) composed of a quarter-wavelength (??/4) nonuniform CPW resonator with a short-stub and a ??/4 single-mode CPW resonator (SMCR) can allocate three split frequencies at the lower end, middle, higher end of the UWB passband. The conventional broadside-coupled microstrip/CPW structure is introduced to improve the bandwidth enhancement around the split frequencies, which leads to good UWB operation. To avoid the interferences such as WLAN signals, the ??/4 meander slot-line structure embedded in the DMR is employed to obtain the notched band inside the UWB passband. The design is then verified by experiment. Good passband and stopband performances are achieved. Specifically, the fabricated filter has a 10 dB notched fractional bandwidth (FBW) of 2.06% at the notched center frequency of 5.80 GHz.

Keywords

band-pass filters; band-stop filters; coplanar waveguides; frequency allocation; microstrip filters; microwave filters; notch filters; resonator filters; slot lines; ultra wideband technology; ??/4 meander slot-line structure; ??/4 single-mode CPW resonator; CPW detached-mode resonator; WLAN signal; bandwidth enhancement; broadside-coupled microstrip structure; compact UWB bandpass filter; coplanar waveguide structure; frequency 5.80 GHz; notched center frequency; quarter-wavelength nonuniform CPW resonator; short stub; split frequency allocation; stopband filter; ultra narrow notched band; ultrawideband bandpass filter; Bandpass filter (BPF); coplanar waveguide (CPW); detached-mode resonator (DMR); microstrip; notched band; ultra-wideband (UWB);

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2010.2040212

Filename

5398824