Synthesis of 4th order lossy filters with uniform Q distribution

Author

Mateu, J. ; Padilla, Alexandra ; Collado, C. ; Martinez-Mendoza, Monica ; Rocas, E. ; Ernst, C. ; O´Callaghan, J.M.

Author_Institution

Univ. Politec. de Catalunya, Castelldefels, Spain

fYear

2010

fDate

23-28 May 2010

Firstpage

1

Lastpage

1

Abstract

Summary form only given. This paper outlines the synthesis procedure for obtaining the folded coupling matrix of lossy filters of 4th order with uniform Q distribution. The method is applied to Butterworth, Chebyshev and Chebyshev with a single pair of symmetrical transmission zeros responses. Closed-form expressions to relate a prescribed insertion loss and filter bandwidth with the required resonator quality factor for an infinite Q flatness filter responses have been obtained. Experimental results on a Chebyschev microstrip filter coincide with the theoretical predictions.

Keywords

Q-factor; microstrip filters; 4th order lossy filters; Chebyschev microstrip filter; closed-form expression; filter bandwidth; folded coupling matrix; infinite Q flatness filter; insertion loss; resonator quality factor; symmetrical transmission zeros response; synthesis procedure; uniform Q distribution; Bandwidth; Chebyshev approximation; Closed-form solution; Couplings; Filtering theory; Insertion loss; Q factor; Resonator filters; Symmetric matrices; Transmission line matrix methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International

Conference_Location

Anaheim, CA

ISSN

0149-645X

Print_ISBN

978-1-4244-6056-4

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2010.5517067

Filename

5517067