Tunable resonator for microwave oscillators and filters
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United States of America Patent
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Nov 25, 1997
Grant Date -
N/A
app pub date -
Jun 12, 1996
filing date -
Jul 2, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A tunable microwave resonator, including walls delimiting a cavity, the walls including a first wall formed with an opening; a tuning screw extending in the opening, a cylindrical dielectric resonator disposed in the cavity, and a dielectric support projecting in the opening, the dielectric support acting as a spacer and rigidly connecting the dielectric resonator to the tuning screw. The cavity and the dielectric resonator are excitable in one or more resonant modes of an electromagnetic field, wherein a current induced by the resonant modes is transferred outside the cavity; and a toroidal extension formed on the first wall inside the cavity and surrounding the opening, the toroidal extension extending a given length inside the cavity, the toroidal extension reducing a thermal effect on the resonance frequency, and increasing mechanical stability.
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