Harmonic suppression technique based on mode coupling control in microstrip multistage coupled ring bandpass filters

Author

Griol, A. ; Mira, D. ; Marti, J. ; Corral, J.L.

Author_Institution

Nanophotonics Technol. Center, Univ. Politecnica de Valencia, Spain

Volume

3

fYear

2004

fDate

6-11 June 2004

Firstpage

1617

Abstract

A technique to suppress higher harmonics in coupled ring bandpass filters is proposed and experimentally demonstrated. This technique basically consists of mitigating the coupling mode between the excitation lines and the microstrip ring, which generates the second harmonic ring resonance. This mode suppression is achieved by optimizing the length of an open-end microstrip line connected to the excitation-coupled lines of the filter. A harmonic suppression ratio for the second harmonic greater than 25 dB in a flat bandpass filter centered at 2.5 GHz is experimentally demonstrated.

Keywords

band-pass filters; coupled mode analysis; harmonics suppression; microstrip circuits; microstrip filters; microwave filters; 2.5 GHz; FDTD methods; coupled ring bandpass filters; excitation lines; excitation-coupled lines; harmonic ring resonance; harmonic suppression; microstrip bandpass filters; microstrip ring; mode coupling control; mode suppression; multistage bandpass filter; open-end microstrip line; second harmonic; Band pass filters; Frequency; Harmonics suppression; Low pass filters; Magnetic resonance; Microstrip filters; Microstrip resonators; Microwave filters; Power harmonic filters; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2004 IEEE MTT-S International

ISSN

0149-645X

Print_ISBN

0-7803-8331-1

Type

conf

DOI

10.1109/MWSYM.2004.1338892

Filename

1338892