Temperature stabilized resonator

Claim 2

A temperature-compensated cavity resonator comprising a circuit for supporting electromagnetic fields, including an electrically conductive ground plane having an aperture therethrough, a hollow cup-shaped thermal compensation member sealing said aperture and having a bottom extending through said ground plane into the area of electromagnetic fields, the thickness of said bottom of said cup being less than that of said ground plane, said cup member being made of a material having a lower ccoefficient of linear thermal expansion than the material forming said ground plane, and a plug of the same material as said ground plane closing said cup and being substantially aligned in said cup with said ground plane.

Claim 3

The resonator according to claim 1 wherein said bottom of said cup has a base substantially aligned with the surface of said ground plane proximate to, and has a surface area projecting beyond said base into, the area supporting electromagnetic fields.

Claim 4

The resonator according to claim 2 wherein said ground plane is flat.

Claim 5

The resonator according to claim 2 wherein said ground plane is a rectangularly shaped conductive member.

Claim 6

The resonator according to claim 1 wherein said aperture is circular and said bottom is cone shaped.

Claim 7

The resonator according to claim 1 wherein said aperture is circular and said bottom is hemispherically shaped.

Claim 8

The resonator according to claim 1 wherein said base is polygon shaped and said projecting bottom is a polyhedron with a plurality of sides having a common point.

Claim 9

An arrangement for the temperature stabilization of the resonant frequency of a microwave cavity resonator, particularly for microwave filters with direct coupled cavity resonators, wherein the cavity resonator is enclosed into a structure having a given coefficient of linear thermal expansion, characterized in that a hollow compensation member is secured to a wall of the cavity resonator in such a manner as to project inwardly; said compensation member having a thickness which is smaller than the thickness of the cavity resonator structure and being made of a material having a lower coefficient of linear thermal expansion than the material forming the structure of the cavity resonator; and characterized in that a circular aperture is provided in a wall of the cavity resonator structure and that the hollow member is in the form of a cup sealing said aperture, said cup having its bottom projecting inwardly into the cavity, and being closed by a plug of the same material as the cavity resonator structure substantially aligned with the cavity resonator wall in which the aperture is provided.

Claim 10

An arrangement for the temperature stabilization of the resonant frequency of a microwave cavity resonator, particularly for microwave filters with direct coupled cavity resonators, wherein the cavity resonator is enclosed into a structure having a given coefficient of linear thermal expansion, characterized in that a hollow compensation member is secured to a wall of the cavity resonator in such a manner as to project inwardly; said compensation member having a thickness which is smaller than the thickness of the cavity resonator structure and being made of a material having a lower coefficient of linear thermal expansion than the material forming the structure of the cavity resonator; and characterized in that a circular aperture is provided in a wall of the cavity resonator structure and that the hollow member is in the form of a cup sealing said aperture, said cup having its bottom projecting inwardly into the cavity, and being closed by a plug of the same material as the cavity resonator structure substantially aligned with the cavity resonator wall in which the aperture is provided.

Claim 11

An arrangement as set forth in claim 8, characterized in that the cup Bottom projecting inwardly into the cavity resonator is cone-shaped.

Claim 12

An arrangement as set forth in claim 8, characterized in that the cup is forced into the aperture of the cavity resonator wall and the plug is in turn forced into the cup.

Claim 13

An arrangement as set forth in claim 10; characterized in that the cup is soldered both to the surface of the aperture in the cavity resonator and to the plug closing the cup.

Claim 14

An arrangement for the temperature stabilization of the resonant frequency of a microwave cavity resonator structure having a given coefficient of thermal expansion comprising: a hollow cup-shaped compensation member sealing an aperture in a wall of the cavity resonator; said compensation member having a bottom projecting inwardly into the caivty, having a bottom wall thickness in the cavity which is less than the thickness of the wall of the cavity resonator structure, and being made of a material having a coefficient of thermal expansion that is different from that of the material forming the cavity resonator structure; and a plus that is made of the same material as the cavity resonator structure closing said cup and being substantially aligned with the apertured wall of the cavity resonator structure.

Claim 15

An arrangement for the temperature stabilization of the resonant frequency of a microwave cavity resonator structure having a given coefficient of thermal expansion comprising: a hollow cup-shaped compensation member sealing an aperture in a wall of the cavity resonator; said compensation member having a bottom projecting inwardly into the caivty, having a bottom wall thickness in the cavity which is less than the thickness of the wall of the cavity resonator structure, and being made of a material having a coefficient of thermal expansion that is different from that of the material forming the cavity resonator structure; and a plus that is made of the same material as the cavity resonator structure closing said cup and being substantially aligned with the apertured wall of the cavity resonator structure.