A Tunable Filter Based on Miniature SIR Coaxial Resonators
Résumé
This paper presents a method of electric tunability
using
varactor diode
s installed on
SIR
coaxial resonators and
associated
filters.
Using
varactor diode
s connected in parallel, in
combination with the
SIR
coaxial resonator, makes it possible, by
increasing the number of
varactor diode
s, to expand the tuning
range and maintain the unloaded quality factor of the resonator.
A second order filt
er, tunable in center frequency, was built with
these resonators, providing a very large tuning range.