Microstrip bandpass filters using MMIC negative resistance circuits for loss compensation

Author

Karacaoglu, U. ; Robertson, L.D. ; Guglielmi, M.

Author_Institution

Commun. Res. Group, King´s Coll., London, UK

fYear

1994

fDate

23-27 May 1994

Firstpage

613

Abstract

A new bandpass filter design technique is presented which uses microstrip resonators assisted by MMIC negative resistance circuits to compensate for the resonator losses. Two filters have been designed and tested in order to demonstrate the high performance that can be achieved with this approach: One uses end-coupled resonators, and has a measured 3-dB bandwidth of only 10 MHz at a center frequency of 5.35 GHz. The second is a 4-pole filter employing dual-mode microstrip ring resonators, and this has a 70 MHz 3 dB bandwidth, centered at 5.27 GHz. These results represent some of the best selectivity performances achieved to date for miniature microwave active filters.<>

Keywords

MMIC; active filters; active networks; band-pass filters; field effect integrated circuits; losses; microstrip components; microwave filters; negative resistance; 10 MHz; 5.27 GHz; 5.35 GHz; 70 MHz; MMIC negative resistance circuits; dual-mode microstrip ring resonators; end-coupled resonators; four-pole filter; loss compensation; microstrip bandpass filters; miniature microwave active filters; resonator losses; Active filters; Band pass filters; Bandwidth; Circuit testing; Electrical resistance measurement; Frequency measurement; MMICs; Microstrip filters; Microstrip resonators; Resonator filters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1994., IEEE MTT-S International

Conference_Location

San Diego, CA, USA

ISSN

0149-645X

Print_ISBN

0-7803-1778-5

Type

conf

DOI

10.1109/MWSYM.1994.335497

Filename

335497