Title :
Microwave active filters based on coupled negative resistance method
Author :
Chang, Chi-Yang ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
fDate :
12/1/1990 12:00:00 AM
Abstract :
A novel coupled negative resistance method for building a microwave active bandpass filter is introduced. Based on this method, four microstrip line end-coupled filters were built. Two are fixed-frequency one-pole and two-pole filters, and two are tunable one-pole and two-pole filters. In order to broaden the bandwidth of the end-coupled filter, a modified end-coupled structure is proposed. Using the modified structure, an active filter with a bandwidth up to 7.5% was built. All of the filters show significant passband performance improvement. Specifically, the passband bandwidth was broadened by a factor of 5 to 20
Keywords :
MMIC; active filters; band-pass filters; microwave filters; negative resistance; solid-state microwave circuits; strip line components; tuning; coupled negative resistance method; end-coupled filters; microstrip line; microwave active bandpass filter; tunable filter; Active filters; Band pass filters; Capacitors; Coupling circuits; Inductors; MMICs; Microwave filters; Microwave frequencies; Microwave theory and techniques; Resistors;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
