Title :
Microstrip side-coupled ring bandpass filters with mode coupling control for harmonic suppression
Author :
Griol, A. ; Mira, D. ; Marti, J. ; Corral, J.L.
Author_Institution :
Valencia Nanophotonics Technol. Center, Univ. Politecnica de Valencia, Spain
fDate :
7/22/2004 12:00:00 AM
Abstract :
A technique to suppress higher harmonics in side-coupled ring bandpass filters is proposed and demonstrated. The proposed technique basically consists of optimising the ring shape and the excitation stage of the complete filter structure in order to mitigate the excitation of the resonant modes that generate the second-harmonic filter resonances. A harmonic suppression ratio for the second harmonic greater than 25 dB in a flat bandpass filter centred at 2.5 GHz is experimentally demonstrated.
Keywords :
UHF filters; band-pass filters; coupled mode analysis; harmonics suppression; microstrip filters; resonance; 2.5 GHz; 25 dB; coupled ring bandpass filters; flat bandpass filter; harmonic suppression; microstrip bandpass filters; mode coupling control; resonant modes; ring shape optimisation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20045160
