Title :
Active varactor tunable microwave filters
Author :
Chandler, S.R ; Hunter, I.C. ; Gardiner, J.G.
Author_Institution :
Telecommunications Research Group, Dept. of Electronic & Electrical Eng. University of Bradford, Bradford, West Yorks., BD7 1DP, England. Tel: +44 274 733466 Fax: +44 274 391521
Abstract :
This paper presents measured results for active microwave bandstop and bandpass varactor tuned filters. These filter designs were based on the negative resistance method and were realised using microstrip with future MMIC implementation in mind. Tuning ranges of 0.3 and 0.6 octaves around a centre frequency of 1.8GHz were achieved. A significant improvement in filter performance was observed with results approaching those for lossless filters.
Keywords :
Band pass filters; Electrical resistance measurement; Frequency; MMICs; Microstrip filters; Microwave filters; Microwave measurements; Performance loss; Tuning; Varactors;
Conference_Titel :
Microwave Conference, 1993. 23rd European
Conference_Location :
Madrid, Spain
DOI :
10.1109/EUMA.1993.336855
