Sharp Roll-Off Lowpass Filter With Wide Stopband Using Stub-Loaded Coupled-Line Hairpin Unit

Author

Velidi, Vamsi Krishna ; Sanyal, Subrata

Author_Institution

Dept. of Electron. & Electr. Commun. Eng., Indian Inst. of Technol., Kharagpur, Kharagpur, India

Volume

21

Issue

6

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

301

Lastpage

303

Abstract

A novel application of shunt open-stubs at the feed points of a center fed coupled-line hairpin resonator is presented for the design of compact lowpass filter (LPF) with very wide stopband. The transmission zeros of the basic unit are minimally affected by its association with the stubs. The stopband bandwidth and filter roll-off rates achieved here are larger than those achieved earlier. A prototype microstrip LPF having a very wide stopband up to nine times the filter cutoff frequency is fabricated.

Keywords

band-stop filters; coupled transmission lines; low-pass filters; microstrip filters; resonator filters; center fed coupled-line hairpin resonator; feed points; filter cutoff frequency; microstrip LPF; sharp roll-off lowpass filter; shunt open-stubs; stopband bandwidth; stub-loaded coupled-line hairpin unit; transmission zeros; wide stopband filter; Bandwidth; Cutoff frequency; Feeds; Filtering theory; Impedance; Microstrip; Wireless communication; Coupled-line; lowpass filter (LPF); microstrip; open-stub; stopband;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2011.2132120

Filename

5767526