Adjustable temperature compensation system for microwave resonators

A system comprising a microwave resonator having at least one cavity having a predefined resonant frequency, said system also comprising a temperature compensation system that is made from a material having a coefficient of thermal expansion that is very low compared to that of a material from which said cavity is made and includes a structure for counteracting the effects of temperature variations on the resonator so that the resonant frequency of said cavity remains within a predetermined range, and said system further comprising a temperature compensation adjustment device adapted to modify the volume of said cavity to adjust the value of said resonant frequency to a predefined value, in which device said cavity comprises a cylindrical wall having a longitudinal axis and two opposite ends, one of which is blocked by a deformable cap, and said temperature compensation system and said temperature compensation adjustment device are coupled to each other and to said resonator so as to exert forces on said cap of said cavity along an axis corresponding to the longitudinal axis of said cavity, wherein said cap comprises a base blocking one end of said cavity and a rod joined to said base and extending out of said cavity along said longitudinal axis thereof and said compensation adjustment device is disposed around said rod and consists of a component of said temperature compensation system that is made from a material having a very low coefficient of thermal expansion.