Title :
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
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;
Conference_Titel :
Microwave Symposium Digest, 1994., IEEE MTT-S International
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-7803-1778-5
DOI :
10.1109/MWSYM.1994.335497
