Patent US3828352A successfully refreshed from Google Patents.
US3828352A
Expired / Lapsed
US
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Antenna system employing toroidal reflectors
Assignee: Thales SA
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Filing: 1972-08-03
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Granted: 1974-08-06
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Expires: 1992-08-03
Abstract
Abstract A microwave antenna consists of two toroidal reflectors turning their concave sides toward a common axis of rotation, i.e., a main reflector farther from that axis and an ancillary reflector closer thereto. The main reflector has a parabolic generatrix with a focal point situated on a point between the axis and the vertex of the ancillary reflector in a common equatorial plane of the two reflectors; the ancillary reflector has a hyperbolic generatrix whose foci substantially coincide with the focal point and with the vertex of the parabolic generatrix.
Inventors
- 👤 S Drabowitch
- 👤 B Daveau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:54
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
An antenna structure for the focusing of microwaves, comprising a first toroidal reflector and a second toroidal reflector centered on a common axis of rotation, each of said reflectors having a surface which is concave toward said axis of rotation and has a generatrix substantially in the form of a segment of a conic section having a focal point located between said axis of rotation and a vertex of the respective surface in a common equatorial plane of said reflectors perpendicular to said axis of rotation; said second reflector lying between said axis of rotation and said first reflector, the generatrix of said first reflector being a segment of a parabola, the generatrix of said second reflector being a segment of a hyperbola having a focus substantially coinciding with the vertex of said parabola, said parabola and hyperbola having a common focal point between said second reflector and said axis of rotation.
Claim 2
Dependent Claim
152 words
An antenna structure for the focusing of microwaves, comprising a first toroidal reflector and a second toroidal reflector centered on a common axis of rotation, each of said reflectors having a surface which is concave toward said axis of rotation and has a generatrix substantially in the form of a segment of a conic section having a focal point located between said axis of rotation and a vertex of the respective surface in a common equatorial plane of said reflectors perpendicular to said axis of rotation; said second reflector lying between said axis of rotation and said first reflector, the generatrix of said first reflector being a segment of a parabola, the generatrix of said second reflector being a segment of a hyperbola having a focus substantially coinciding with the vertex of said parabola, said parabola and hyperbola having a common focal point between said second reflector and said axis of rotation.
Claim 3
Dependent Claim
129 words
An antenna structure for the focusing of microwaves, comprising a first toroidal reflector and a second toroidal reflector centered on a common axis of rotation, each of said reflectors having a surface which is concave toward said axis of rotation and has a generatrix substantially in the form of a segment of a conic section having a focal point located between said axis of rotation and A vertex of the respective surface in a common equatorial plane of said reflectors perpendicular to said axis of rotation; the surface of said first reflector following a great circle of radius R in said equatorial plane and the surface of said second reflector following a great circle of radius r in said equatorial plane, said radii substantially satisfying the relationship r 2R/3.
Claim 4
Dependent Claim
129 words
An antenna structure for the focusing of microwaves, comprising a first toroidal reflector and a second toroidal reflector centered on a common axis of rotation, each of said reflectors having a surface which is concave toward said axis of rotation and has a generatrix substantially in the form of a segment of a conic section having a focal point located between said axis of rotation and A vertex of the respective surface in a common equatorial plane of said reflectors perpendicular to said axis of rotation; the surface of said first reflector following a great circle of radius R in said equatorial plane and the surface of said second reflector following a great circle of radius r in said equatorial plane, said radii substantially satisfying the relationship r 2R/3.
Claim 5
Dependent Claim
20 words
An antenna structure as defined in claim 2 wherein the ratio of said radii is substantially given by r/R 0.675.
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 |