Title :
Dual-mode quasi-elliptic-function bandpass filters using ring resonators with enhanced-coupling tuning stubs
Author :
Hsieh, Lung-Hwa ; Chang, Kai
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
5/1/2002 12:00:00 AM
Abstract :
A novel microwave dual-mode quasi-elliptic-function bandpass filter structure has been designed and fabricated. The filter uses L-shaped coupling arms for enhanced coupling and dual-mode excitation. The effects of varying the length of tuning stubs and gap size between tuning stubs and ring resonator have been studied. Filters using multiple cascaded ring resonators with high rejection band are presented. The new filters have been verified by simulation and measurement with good agreement
Keywords :
UHF filters; band-pass filters; microstrip filters; microstrip resonators; microwave filters; resonator filters; L-shaped coupling arms; dual-mode quasi-elliptic-function filter; enhanced coupling; high rejection band; loaded Q; microstrip resonator; microwave bandpass filter; multiple cascaded resonators; narrow passband bandwidth; ring resonator; sharp rejection band; tuning stubs; unloaded Q; Band pass filters; Coupling circuits; Dielectric losses; Feeds; Insertion loss; Microstrip resonators; Microwave filters; Optical ring resonators; Resonator filters; Tuning;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
