Compact Wideband Bandstop Filter With Five Transmission Zeros

Author

Mandal, Mrinal Kanti ; Divyabramham, Kandimalla ; Velidi, Vamsi Krishna

Author_Institution

Ecole Polytech. de Montreal, Montréal, QC, Canada

Volume

22

Issue

1

fYear

2012

Firstpage

4

Lastpage

6

Abstract

A compact parallel-coupled transmission line section, connected at their both ends, is presented to obtain multiple transmission zeros. As much as five transmission zeros can be obtained. The zeros can be arranged to design a sharp rejection wideband bandstop filter (BSF). A lossless transmission line model is used to analyze the structure and hence to obtain closed form expressions for the -parameters and design graphs to facilitate the filter synthesis procedure. Theoretical predictions are validated by fabricating a BSF in microstrip line technology. The single filter unit provides 29 dB stopband over a fractional bandwidth of 60% at the mid-band frequency of 1.47 GHz.

Keywords

band-stop filters; coupled transmission lines; microstrip lines; poles and zeros; BSF; closed form expressions; compact parallel-coupled transmission line section; compact wideband bandstop filter; design graphs; filter synthesis procedure; fractional bandwidth; lossless transmission line model; microstrip line technology; midband frequency; multiple transmission zeros; sharp rejection wideband bandstop filter; single filter unit; stopband; Couplings; Filtering theory; Impedance; Poles and zeros; Wideband; Wireless communication; Bandstop filter (BSF); coupled-line; microstrip line; signal interference technique; transmission line;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2173928

Filename

6107593