Design of ultra-wideband bandstop filter using defected ground structure

Author

Fu-Chang Chen ; Ning-Yu Zhang ; Pei-Sheng Zhang ; Qing-Xin Chu

Author_Institution

Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou, China

Volume

49

Issue

16

fYear

2013

fDate

Aug. 1 2013

Firstpage

1010

Lastpage

1011

Abstract

A simple wideband bandstop filter which yields equal ripples in the stopband is described. The filter comprises only two resonators and a connecting transmission line. Ultra-wide stopband characteristic is achieved by realising three transmission zeros near the passband edges. Stopband rejection depth and bandwidth can be controlled by impedances of the configuration. The defected ground structure is chosen to realise the high impedance line. To validate the proposed topology, a compact microstrip bandstop filter centred at 1.5 GHz with a measured 20 dB rejection bandwidth of about 139% is fabricated.

Keywords

band-stop filters; defected ground structures; microstrip filters; poles and zeros; ultra wideband technology; compact microstrip bandstop filter; connecting transmission line; defected ground structure; frequency 1.5 GHz; high impedance line; passband edges; resonators; stopband rejection depth; transmission zeros; ultrawide stopband characteristic; ultrawideband bandstop filter;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el.2013.1541

Filename

6571500