US3701959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave cavity resonator with printed circuit interior walls and modulation coils
Assignee: Varian Medical Systems Inc
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Filing: 1971-03-24
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Granted: 1972-10-31
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Expires: 1991-03-24
Abstract
Abstract A microwave cavity resonator useful in electron paramagnetic resonance spectrometers made from a printed circuit board having an electrically conductive surface printed on one side thereof and folded so as to form a plurality of the walls of a parallelepipedon cavity resonator, the conductive surface of the circuit board forming the inner conductive surfaces of the cavity. Modulation coils formed by printed circuit techniques on the other side of the circuit board serve as field modulation coils for the cavity resonator, the conductive inner wall surfaces aligned with said coils being made pervious to enhance penetration of the modulation field into the cavity resonator.
Inventors
- 👤 Stuart C Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:17
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/345; H; H01; H01P; H01P7/00; H01P7/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016; Y10T29/49018
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A microwave cavity resonator comprising a parallelepipedon cavity including two side walls, a top and bottom wall and two end walls having electrically conducting inner wall surfaces, at least four of said walls being formed by a unitary sheet of printed circuit board having one surface coated with an electrically conductive film which forms said electrically conducting inner wall surfaces, said circuit board being folded along a plurality of lines each fold forming the juncture of a different two of said inner wall surfaces wherein two of said four walls comprise said two side walls, said inner electrically conducting wall surfaces on said two side walls having a portion thereof previous to magnetic flux, and a modulation coil formed by a printed circuit on the outer surface of each of two side walls aligned with said pervious portions of the inner wall surfaces.
Claim 2
Dependent Claim
143 words
A microwave cavity resonator comprising a parallelepipedon cavity including two side walls, a top and bottom wall and two end walls having electrically conducting inner wall surfaces, at least four of said walls being formed by a unitary sheet of printed circuit board having one surface coated with an electrically conductive film which forms said electrically conducting inner wall surfaces, said circuit board being folded along a plurality of lines each fold forming the juncture of a different two of said inner wall surfaces wherein two of said four walls comprise said two side walls, said inner electrically conducting wall surfaces on said two side walls having a portion thereof previous to magnetic flux, and a modulation coil formed by a printed circuit on the outer surface of each of two side walls aligned with said pervious portions of the inner wall surfaces.
Claim 3
Dependent Claim
32 words
A microwave cavity as claimed in claim 1 wherein said pervious portions are forMed by a plurality of spaced-apart openings extending through the electrically conductive surface and into the printed circuit board.
Claim 4
Dependent Claim
27 words
A microwave cavity as claimed in claim 2 wherein said openings occupy less than half of the surface area of said pervious portions of the side walls.
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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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |