Patent US4361044A successfully refreshed from Google Patents.
Patent US3828244A successfully refreshed from Google Patents.
US3828244A
Expired / Lapsed
US
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Coaxial line to microwave coupler
Assignee: Varian Medical Systems Inc
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Filing: 1973-06-14
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Granted: 1974-08-06
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Expires: 1993-06-14
Abstract
Abstract A variable microwave coupler between a coaxial line and an EPR microwave cavity. A housing includes the resonant cavity as well as a section dimensioned to be a waveguide. Energy from the coaxial line is coupled into this section. The section is dimensioned to be a waveguide beyond cutoff and it has an opening into the resonant cavity. A planar loop located in the section is connected to be excited by the energy in the line. The loop is rigidly positioned so that its plane is substantially at right angles to a microwave magnetic field in the cavity. A microwave energy radiator is positioned in the section to be inductively coupled with the microwave energy from the loop. The radiator is positioned in the section, adjacent an intersection between the section and cavity, to electromagnetically radiate the energy inductively coupled to it into the cavity. Inductive coupling between the loop and the radiator is selectively controlled to vary the amount of energy electromagnetically radiated by the radiator into the cavity.
Inventors
- 👤 J Hyde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:48
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/345
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
184 words
An EPR spectrometer comprising a cavity for supporting a sample to be analyzed, means for providing a relatively low frequency magnetic field in the sample, a microwave energy source having a frequency for electromagnetically exciting said cavity to resonance, a coaxial line coupling said microwave source and the cavity, and means for variably coupling microwave energy from the coaxial line to the resonant portion of the cavity, said variable coupling means including: a section in a portion of said cavity, said section being dimensioned so that it is a waveguide beyond cutoff for the frequency propagating in said line, a nonferromagnetic, metallic electromagnetic radiator for the energy, said radiator being positioned in the section to electromagnetically excite the cavity with the energy, a fixedly mounted termination for said line connected to the line to be excited by the energy propagating in said line, said termination being positioned in the section to be inductively coupled with said radiator, and means for controlling the inductive coupling between the termination and the radiator to control the amount of said energy radiated by the radiator into the cavity.
Claim 2
Dependent Claim
184 words
An EPR spectrometer comprising a cavity for supporting a sample to be analyzed, means for providing a relatively low frequency magnetic field in the sample, a microwave energy source having a frequency for electromagnetically exciting said cavity to resonance, a coaxial line coupling said microwave source and the cavity, and means for variably coupling microwave energy from the coaxial line to the resonant portion of the cavity, said variable coupling means including: a section in a portion of said cavity, said section being dimensioned so that it is a waveguide beyond cutoff for the frequency propagating in said line, a nonferromagnetic, metallic electromagnetic radiator for the energy, said radiator being positioned in the section to electromagnetically excite the cavity with the energy, a fixedly mounted termination for said line connected to the line to be excited by the energy propagating in said line, said termination being positioned in the section to be inductively coupled with said radiator, and means for controlling the inductive coupling between the termination and the radiator to control the amount of said energy radiated by the radiator into the cavity.
Claim 3
Dependent Claim
20 words
The coupler of claim 1 wherein the means for controlling includes means fOr moving the radiator relative to the termination.
Claim 4
Dependent Claim
62 words
The spectrometer of claim 1 wherein the termination is a planar loop, said radiator comprising a metal stud mounted with a longitudinal axis coplanar with the loop and at right angles to the plane of magnetic flux lines inductively coupling the loop and the stud, and the means for controlling comprises means for varying the length of the stud in the section.
Claim 5
Dependent Claim
47 words
The spectrometer of claim 1 wherein the termination is a planar loop, said radiator comprising a metal disc mounted for rotation about an axis at right angles to the plane of the loop, and the means for controlling comprises means for rotating the disc about the axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |