Patent ID: 8847710

Claim:
A microwave filter with a dielectric resonator having a longitudinal axis Z, comprising: at least one resonant cavity according to at least one resonance mode and at least one resonance frequency, the cavity being delimited by at least one longitudinal wall and transversal walls, the longitudinal and transversal walls being made of a material that has a non-zero expansion coefficient; the dielectric resonator mounted in the at least one resonant cavity transversally to the axis Z, the dielectric resonator not being temperature compensated or being partially temperature compensated; a mechanical device for compensating the resonance frequency of the at least one resonant cavity as a function of a temperature, wherein the mechanical compensation device having at least one rotationally mobile finger for each resonance mode, the mobile finger being provided with a plunger penetrating into the at least one resonant cavity to a fixed depth and at a distance D from the resonator, the distance D being defined at ambient temperature and being temperature-variable, at least one pivot link formed in the longitudinal wall, the plunger penetrating into the cavity via the pivot link, and and an external mechanical actuator for controlling a rotation of the mobile finger by pivoting around the at least one pivot link, the actuator being made of a material that has a coefficient of thermal expansion at least five times lower than that of the walls of the filter and being mounted parallel to the axis Z at a non-zero height H from the longitudinal wall of the filter and mechanically coupled to an external top part of the mobile finger.