Title :
A varactor-tuned RF filter
Author :
Brown, Andrew R. ; Rebeiz, Gabriel M.
Author_Institution :
Dept. of Electr. Eng., Michigan Univ., Ann Arbor, MI, USA
fDate :
7/1/2000 12:00:00 AM
Abstract :
An electronically tunable filter at 1 GHz is presented in this paper. The filter uses a suspended substrate design and commercially available varactors for filter tuning. The filter has a 60% tuning range from 700 MHz to 1.33 GHz with a low insertion loss (better than 3 dB from 1 to 1.33 GHz). This paper discusses the effects of the varactor series resistance and the electrical length of the distributed resonator on the overall resonator quality factor and filter insertion loss. The input third-order intermodulation product intercept point was measured to be better than 17 dBm across the entire tuning range
Keywords :
Q-factor; UHF filters; band-pass filters; circuit tuning; losses; passive filters; resonator filters; varactors; 3 dB; 700 MHz to 1.33 GHz; distributed resonator; electrical length; electronically tunable filter; filter insertion loss; filter tuning; input third-order intermodulation product intercept point; low insertion loss; resonator quality factor; suspended substrate design; varactor series resistance; varactor-tuned RF filter; Band pass filters; Diodes; Fingers; Insertion loss; Magnetic separation; Radar tracking; Radio frequency; Resonator filters; Tuning; Varactors;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
