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

Volume

38

Issue

12

fYear

1990

fDate

12/1/1990 12:00:00 AM

Firstpage

1879

Lastpage

1884

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;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.64569

Filename

64569