Patent US4633180A successfully refreshed from Google Patents.
US4633180A
Expired / Lapsed
US
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Cavity resonator
Assignee: Bruker Biospin GmbH
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Filing: 1984-01-04
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Granted: 1986-12-30
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Expires: 2004-01-04
Abstract
Abstract A cavity resonator serves to generate magnetic dipole transitions in a sample, for instance for carrying out electron spin resonance measurements. The natural frequency of the cavity resonator (10) is influenced by a reduction in length of the E flux lines. To this end, conductive areas (20) are arranged at the points where the E flux lines are encountered. This results in an increase of the space factor, related to an unchanged specimen volume, and thus in an improvement of the measuring sensitivity.
Inventors
- 👤 Reinhard Biehl
- 👤 Dieter Schmalbein
- 👤 Gunther Laukien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:02
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/343; G01R33/345; H; H01; H01P; H01P7/00; H01P7/06
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
196 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a microwave cavity resonator formed from electrically conductive material and defined by end faces and lateral walls the physical dimensions of which determine the natural resonant frequency of the cavity resonator at a given microwave resonant mode, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity resonator to establish a mode of operation, determined by said microwave resonant mode, in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity resonator, said electrically conductive means having conductive paths along said electric flux lines and being effective to reduce the natural frequency of said cavity resonator leading to a high filling factor whereby large volume cavity resonators normally required at low frequencies can be made smaller in size.
Claim 2
Dependent Claim
196 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a microwave cavity resonator formed from electrically conductive material and defined by end faces and lateral walls the physical dimensions of which determine the natural resonant frequency of the cavity resonator at a given microwave resonant mode, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity resonator to establish a mode of operation, determined by said microwave resonant mode, in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity resonator, said electrically conductive means having conductive paths along said electric flux lines and being effective to reduce the natural frequency of said cavity resonator leading to a high filling factor whereby large volume cavity resonators normally required at low frequencies can be made smaller in size.
Claim 3
Dependent Claim
168 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a cavity formed from electrically conductive material and having end faces and lateral walls, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity to establish a mode of oscillation in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity, said electrically conductive means having conductive paths along said electric flux lines, said electrically conductive means being barrel shaped and arranged coaxially to said conductor z, said electrically conductive means being subdivided into conductive and non-conductive sectors, the non-conductive sectors being made of non-conductive material with low dielectric losses.
Claim 4
Dependent Claim
168 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a cavity formed from electrically conductive material and having end faces and lateral walls, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity to establish a mode of oscillation in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity, said electrically conductive means having conductive paths along said electric flux lines, said electrically conductive means being barrel shaped and arranged coaxially to said conductor z, said electrically conductive means being subdivided into conductive and non-conductive sectors, the non-conductive sectors being made of non-conductive material with low dielectric losses.
Claim 5
Dependent Claim
30 words
The microwave resonator as recited in claim 2, wherein said cavity is of cylindrical shape and being excited by an oscillation mode H 01n , wherein n is an integer.
Claim 6
Dependent Claim
31 words
The microwave resonator as recited in claim 3, wherein said electrically conductive means are shaped in the form of sectors of a torus and arranged coaxially relative to said coordinate z.
Claim 7
Dependent Claim
32 words
The microwave resonator as recited in claim 4, wherein said sectors are subdivided into portions, said portions being arranged in parallel next to each other along the direction of said coordinate z.
Claim 8
Dependent Claim
41 words
The microwave resonator as recited in claim 4, wherein said sectors are arranged on a coaxial tube, said tube being made of a non-conductive material with low dielectric losses, and extending in perpendicular direction to said end faces of said cavity.
Claim 9
Dependent Claim
20 words
The microwave resonator as recited in claim 6, wherein said tube forms part of a dewar for heating said sample.
Claim 10
Dependent Claim
38 words
The microwave resonator as recited in claim 3, wherein the ratio of the radius of said cylindrical shaped cavity, to the radius of said barrel shaped electrically conductive means, is not less than 1.3 nor greater than 8.0.
Claim 11
Dependent Claim
187 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a cavity formed from electrically conductive material and having end faces and lateral walls, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity to establish a mode of oscillation in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity, said electrically conductive means having conductive paths along said electric flux lines, said electrically conductive means being of barrel shape in form of sectors of a torus and arranged coaxially to said coordinate z, said electrically conductive means comprising a first conductive film with at least one actual gap, said actual gap and an adjacent area of said first conductive film being overlapped by a second conductive film.
Claim 12
Dependent Claim
187 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a cavity formed from electrically conductive material and having end faces and lateral walls, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity to establish a mode of oscillation in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity, said electrically conductive means having conductive paths along said electric flux lines, said electrically conductive means being of barrel shape in form of sectors of a torus and arranged coaxially to said coordinate z, said electrically conductive means comprising a first conductive film with at least one actual gap, said actual gap and an adjacent area of said first conductive film being overlapped by a second conductive film.
Claim 13
Dependent Claim
36 words
The microwave resonator as recited in claim 9, wherein said first conductive film is arranged on an inner wall of a dewar and said second conductive film is arranged on an outer wall of said dewar.
Claim 14
Dependent Claim
175 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a cavity formed from electrically conductive material and having end faces and lateral walls, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity to establish a mode of oscillation in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity, said electrically conductive means having conductive paths along said electric flux lines, said electrically conductive means being barrel shaped and arranged coaxially to said coordinate z, said electrically conductive means being subdivided into conductive and non-conductive sectors, at least one of said non-conductive sectors being extended longitudinally towards one of said end faces of said cavity.
Claim 15
Dependent Claim
175 words
A microwave resonator for generating magnetic dipole transitions in a sample of material under investigation, said resonator comprising: a cavity formed from electrically conductive material and having end faces and lateral walls, said end faces extending in a perpendicular direction to a first coordinate z and said lateral walls extending in a parallel direction thereto; a sample tube containing said sample and being arranged along said coordinate z and further extending through an aperture in one of said end faces; coupling means for coupling microwave energy into said cavity to establish a mode of oscillation in which magnetic flux lines are concentrated along said sample and electric flux lines extending therearound; and electrically conductive means arranged within said cavity, said electrically conductive means having conductive paths along said electric flux lines, said electrically conductive means being barrel shaped and arranged coaxially to said coordinate z, said electrically conductive means being subdivided into conductive and non-conductive sectors, at least one of said non-conductive sectors being extended longitudinally towards one of said end faces of said cavity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |