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Patent EP0173545A2 successfully refreshed from Google Patents.
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EP0173545A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Crystalline alumina loaded cavity resonator

Assignee: University of Western Australia
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Filing: 1985-08-21
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Granted: —
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Expires: 2005-08-21
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Abstract

Abstract This invention describes a crystalline alumina loaded cavity resonator which has low loss and high frequency stability such that its frequency is well-defined and only weakly perturbed by temperature, pressure and mechanical changes in its environment. Basically the resonator is a single crystal of sapphire (1) having protusions (2) and (2 min ) fitting closely into recesses in the base (3) and lid (3 min ) of a niobium housing. The lid (3 min ) is clamped by groove (4) and having a indium seal to seal the lid (3 min ) to the side walls (5) at groove (6) in lid (3 min ). A microwave probe (7) is used to couple microwave power into the cavity through hole (8).

Inventors

  • 👤 David Gerald Blair

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 22:32
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/10; H01P7/06

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 56 words
A crystalline alumina loaded cavity resonator comprising a crystalline alumina dielectric resonator having at least one protrusion whereby it can be rigidly mounted inside a metallic housing such that the main body of the said crystalline alumina dielectric resonator is separated a significant distance from the inside walls of the said housing constituting an electromagnetic cavity.
Claim 2
Dependent Claim 56 words
A crystalline alumina loaded cavity resonator comprising a crystalline alumina dielectric resonator having at least one protrusion whereby it can be rigidly mounted inside a metallic housing such that the main body of the said crystalline alumina dielectric resonator is separated a significant distance from the inside walls of the said housing constituting an electromagnetic cavity.
Claim 3
Dependent Claim 17 words
A crystalline alumina loaded cavity resonator as claimed in claim 1 wherein the crystalline alumina is sapphire.
Claim 4
Dependent Claim 21 words
A crystalline alumina loaded cavity resonator as claimed in claim 1 or claim 2 wherein the housing is composed of niobium.
Claim 5
Dependent Claim 33 words
A crystalline alumina loaded cavity resonator as claimed in claim 1 wherein the crystalline alumina dielectric resonator is a spindle shaped sapphire dielectric resonator occupying some 25% of the volume of the cavity.
Claim 6
Dependent Claim 14 words
A crystalline alumina loaded cavity resonator as claimed in claim 1 of cylindrical shape.
Claim 7
Dependent Claim 49 words
A sapphire loaded cavity resonator as claimed in claim 1 of cylindrical shape wherein the crystalline alumina dielectric resonator is a right circular spindle of sapphire supported by end pieces which fit into recesses in end walls of the said metallic homing whereby the sapphire resonator is rigidly mounted.
Claim 8
Dependent Claim 47 words
A high efficiency particle acceleration element constituted by a crystalline alumina loaded cavity resonator as claimed in claim 1 further provided with beam entry holes in the housing in line with a hole in the crystalline alumina dielectric resonator to allow penetration of a charged particle beam.

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