Tunable resonator for microwave oscillators and filters
First Claim
1. A tunable microwave resonator, comprising:
- walls delimiting a cavity, said walls including a first wall formed with an opening;
a tuning screw extending in said opening, a cylindrical dielectric resonator disposed in said cavity, and a dielectric support projecting in said opening, said dielectric support acting as a spacer and rigidly connecting said dielectric resonator to said tuning screw;
said cavity and said dielectric resonator being exciteable to one or more resonant modes of an electromagnetic field, wherein a current induced by the resonant modes is transfered outside said cavity;
and a toroidal extension formed on said first wall inside said cavity and surrounding said opening, said toroidal extension extending a given length inside said cavity, said toroidal extension reducing a thermal effect on the resonance frequency, and increasing a mechanical stability.
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Accused Products
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.
59 Citations
23 Claims
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1. A tunable microwave resonator, comprising:
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walls delimiting a cavity, said walls including a first wall formed with an opening; a tuning screw extending in said opening, a cylindrical dielectric resonator disposed in said cavity, and a dielectric support projecting in said opening, said dielectric support acting as a spacer and rigidly connecting said dielectric resonator to said tuning screw; said cavity and said dielectric resonator being exciteable to one or more resonant modes of an electromagnetic field, wherein a current induced by the resonant modes is transfered outside said cavity; and a toroidal extension formed on said first wall inside said cavity and surrounding said opening, said toroidal extension extending a given length inside said cavity, said toroidal extension reducing a thermal effect on the resonance frequency, and increasing a mechanical stability. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A microwave filter, comprising:
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a hollow body formed with walls defining a plurality of resonant cavities disposed in mutual succession, said walls including a first wall having first openings formed therein each leading into a respective one of said cavities; tuning screws disposed in each of said first openings, said tuning screws each carrying a dielectric support and a dielectric resonator disposed in each of said cavities, said dielectric supports acting as spacers and penetrating in said first openings; said hollow body being formed with an input port for a microwave signal to be filtered, said input port being defined by a second opening leading into a first of said cavities, and with an output port for a filtered signal, said output port being defined by a third opening leading from a last of said cavities to an outside of said body; said body further including dividing walls separating said cavities, said dividing walls each being formed with fourth openings electromagnetically coupling adjacent cavities; and toroidal extensions of said first wall surrounding said first openings, each said toroidal extension extending for a given length inside said respective cavity, said toroidal extensions reducing thermal effect on the bandpass central frequency, and increasing mechanical stability. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification