Compact Wideband Bandstop Filter With Four Transmission Zeros

Author

Sánchez-Soriano, Miguel Á ; Torregrosa-Penalva, Germán ; Bronchalo, Enrique

Author_Institution

Signal Theor. & Commun. Div., Miguel Hernandez Univ., Alicante, Spain

Volume

20

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

313

Lastpage

315

Abstract

This work presents a new type of compact wideband bandstop filter (BSF) with four transmission zeros in the stopband. The proposed filter topology consists of a coupled line directional coupler connected in parallel to an interference transmission line. The filter characteristics can be easily controlled by the coupling factor of the coupled line coupler and the characteristic admittances of both the coupler and the transmission line. Design equations and curves are provided for the filter design. To validate the proposed topology, a compact microstrip BSF centered at 2.0 GHz with a measured 20 dB rejection bandwidth of 100% and sharp rejection characteristics is designed and built.

Keywords

band-stop filters; directional couplers; electric admittance; transmission line theory; characteristic admittance; compact microstrip BSF; compact wideband bandstop filter; coupled line directional coupler; coupling factor; design equations; filter topology; frequency 2 GHz; interference transmission line; rejection bandwidth; transmission zeros; Coupled line; microstrip filters; transmission zero; wideband bandstop filters;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2010.2047468

Filename

5453081