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US4399406A Expired / Lapsed US ⏱️ 0.0 years remaining

Test head for electron spin resonance and paramagnetic electron resonance measurements

Assignee: Bruker Biospin GmbH
•
Filing: 1981-06-09
•
Granted: 1983-08-16
•
Expires: 2001-06-09
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Abstract

Abstract A test head for electron spin resonance and paramagnetic electron resonance measurements comprises a resonator of circular cylindrical shape adapted to accommodate a coaxially arranged test tube, and a waveguide arrangement for exciting the H 011 wave in the resonator, said waveguide arrangement comprising one section having its one end arranged adjacent one face of the resonator and communicating with the resonator via an opening provided in the face in eccentrical arrangement relative to the resonator. In order to enable the coupling coefficient to be varied and, thus, the resonator to be adapted to the waveguide section, the waveguide section carrying a H 1n wave communicates with the resonator via a coupling slot the angular position (φ) of which can be varied relative to the radial plane of the resonator passing through its center. Preferably, the waveguide section exhibits a circular cross-section and can be rotated about its axis. It guides the H 11 wave, and the coupling slot is provided, symmetrically relative to the axis of the waveguide section, in a wall portion connected to the said waveguide section.

Inventors

  • 👤 Reinhard Biehl
  • 👤 Dieter Schmalbein

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 05:32
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/345

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 116 words
A test head for electron spin resonance and paramagnetic electron resonance measurements comprising a resonator of circular cylindrical shape adapted to accommodate a coaxially arranged test tube, and a waveguide arrangement for exciting the H 011 wave in the resonator, said waveguide arrangement comprising one section having its one end arranged adjacent one face of the resonator and communicating with the resonator via an opening provided in the face in eccentrical arrangement relative to the resonator, characterized in that the waveguide section carrying a H 1n wave communicates with the resonator via a coupling slot the angular position (φ) of which can be varied relative to the radial plane of the resonator passing through its centre.
Claim 2
Dependent Claim 116 words
A test head for electron spin resonance and paramagnetic electron resonance measurements comprising a resonator of circular cylindrical shape adapted to accommodate a coaxially arranged test tube, and a waveguide arrangement for exciting the H 011 wave in the resonator, said waveguide arrangement comprising one section having its one end arranged adjacent one face of the resonator and communicating with the resonator via an opening provided in the face in eccentrical arrangement relative to the resonator, characterized in that the waveguide section carrying a H 1n wave communicates with the resonator via a coupling slot the angular position (φ) of which can be varied relative to the radial plane of the resonator passing through its centre.
Claim 3
Dependent Claim 37 words
A test head in accordance with claim 1, characterized in that the coupling slot is positioned at a point relative to the resonator where the highest current density is encountered in the face wall of the resonator.
Claim 4
Dependent Claim 65 words
A test head in accordance with claim 1, characterized in that the waveguide section is of circular cross-section and carries the H 11 wave, that the coupling slot is provided, in symmetrical relation to the axis of the waveguide section, in a wall portion connected to the said waveguide section, and that the waveguide section can be rotated about its axis relative to the resonator.
Claim 5
Dependent Claim 41 words
A test head in accordance with claim 3, characterized in that the wall portion forming simultaneously the end portion of the resonator is formed by a dielectric plate with a thin metal coating provided on its side facing the waveguide section.
Claim 6
Dependent Claim 20 words
A test head in accordance with claim 4, characterized in that the plate is made of glass-fibre reinforced polytetrafluor ethylene.
Claim 7
Dependent Claim 29 words
A test head in accordance with claim 3, characterized in that the waveguide section is connected to a coaxially arranged rectangular waveguide via a H 10 -H 11 adaptor.
Claim 8
Dependent Claim 44 words
A test head in accordance with claim 6, characterized in that the broad sides of the rectangular waveguide extend in parallel to the radial plane of the resonator passing through the axis of the rectangular waveguide and of the waveguide section of circular cross-section.
Claim 9
Dependent Claim 32 words
A test head in accordance with claim 1, characterized in that its different components which can be rotated relative to each other are resiliently urged against each other in the axial direction.

References Cited (Backward Citations)

US4314204A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-08-15 1987-02-14 1987-08-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-08-15 1991-02-14 1991-08-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-08-15 1995-02-14 1995-08-16 $7700.00 Window Closed / Lapsed

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