Patent US3949328A successfully refreshed from Google Patents.
US3949328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable-reflectivity device for varying output power of microwave generator
Assignee: Cgr-Mev
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Filing: 1975-03-20
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Granted: 1976-04-06
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Expires: 1995-03-20
Abstract
Abstract A microwave reflector device of small size, making it possible to deliver a predetermined quantity of the power generated by a high-power microwave generator, comprises a unidirectional element which imposes an appropriate constant load on the generator, and a reflector system constituted by a waveguide D tapped into the output waveguide T of the unidirectional element, said waveguide D being terminated at its free end by a metal plate carrying three quartz rods 10, 11, 12 designed to slide, parallel to the axis of the waveguide D, respectively in three metallic sleeves 13, 14, 15 having a circular shape and dimensioins such that they form cut-off waveguides at the operating frequency of the generator. The free end of each of the sleeves 13, 14, 15 provided with three respective rings 16, 17, 18 of absorber material.
Inventors
- 👤 Claude Levaillant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:52
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
A microwave reflector device which makes it possible to deliver a predetermined quantity of the power produced by a microwave generator, comprising a unidirectional transmission element and a reflector system, said reflector system comprising a first waveguide of rectangular section, tapped into one of the sides of a waveguide arranged at the output of said unidirectional element, said first waveguide being terminated by a terminal metal plate to which there is fixed, perpendicularly thereto, at least one cylindrical metal sleeve in which there can slide, parallel to the axis of said waveguide, a piston made of a dielectric material, the internal diameter of said sleeve being such that at the operating frequency of the generator the sleeve acts as a circular cut-off waveguide.
Claim 2
Dependent Claim
123 words
A microwave reflector device which makes it possible to deliver a predetermined quantity of the power produced by a microwave generator, comprising a unidirectional transmission element and a reflector system, said reflector system comprising a first waveguide of rectangular section, tapped into one of the sides of a waveguide arranged at the output of said unidirectional element, said first waveguide being terminated by a terminal metal plate to which there is fixed, perpendicularly thereto, at least one cylindrical metal sleeve in which there can slide, parallel to the axis of said waveguide, a piston made of a dielectric material, the internal diameter of said sleeve being such that at the operating frequency of the generator the sleeve acts as a circular cut-off waveguide.
Claim 3
Dependent Claim
50 words
A device as claimed in claim 1, wherein said terminal plate of said first waveguide contains three metal sleeves in which there can displace three dielectric pistons, said sleeves being arranged at the corners of an isosceles triangle whose base is parallel to the longer sides of the first waveguide.
Claim 4
Dependent Claim
18 words
A device as claimed in claim 1, wherein said rod sliding in said sleeve, is made of quartz.
Claim 5
Dependent Claim
24 words
A device as claimed in claim 1, wherein the internal walls of said metal sleeves are covered by a film of a dielectric material.
Claim 6
Dependent Claim
13 words
A device as claimed in claim 4, wherein said film is of polytetrafluorethylene.
Claim 7
Dependent Claim
13 words
A device as claimed in claim 4, wherein said film is of polyethylene-boron.
Claim 8
Dependent Claim
21 words
A device as claimed in claim 1, wherein the end of said sleeve is provided with a ring of absorber material.
Claim 9
Dependent Claim
14 words
A device as claimed in claim 7, wherein said ring is made of graphite.
References Cited (Backward Citations)
US2634331A
Cited
US3784777A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |