Title :
Broadband and tunable negative monolithic circuits for microwave active filters compensation
Author :
Brucher, A. ; Meunier, Philippe ; Cenac, C. ; Jarry, B. ; Guillon, Pierre
Author_Institution :
IRCOM, Limoges Univ., France
Abstract :
In this article, GaAs MMIC negative resistance chips are presented. These devices are used to improve the performances of planar microstrip resonator structures. The broadband capabilities of these negative resistance circuits are illustrated with their use to compensate for the losses of two 4-pole bandpass microstrip half wave filters designed with alumina substrate and centered respectively at 1.5 GHz and 4 GHz. Finally, experimental results of bandstop active filters built on lossy high permittivity dielectric substrate (/spl epsi//sub r/=36) and also compensated for with these monolithic circuits confirm their potential.<>
Keywords :
III-V semiconductors; UHF filters; active filters; active networks; band-pass filters; band-stop filters; circuit tuning; compensation; field effect MMIC; gallium arsenide; microstrip filters; microstrip resonators; microwave filters; negative resistance devices; resonator filters; 1.5 GHz; 4 GHz; Al/sub 2/O/sub 3/; GaAs; MMIC negative resistance chips; SHF; UHF; alumina substrate; bandpass microstrip half wave filters; bandstop active filters; broadband operation; lossy high permittivity dielectric substrate; microwave active filters compensation; planar microstrip resonators; tunable MMIC; Active filters; Band pass filters; Dielectric substrates; Gallium arsenide; MMICs; Microstrip filters; Microstrip resonators; Microwave circuits; Microwave devices; Tunable circuits and devices;
Conference_Titel :
Microwave Symposium Digest, 1995., IEEE MTT-S International
Conference_Location :
Orlando, FL, USA
Print_ISBN :
0-7803-2581-8
DOI :
10.1109/MWSYM.1995.406000
