Patent US3688311A successfully refreshed from Google Patents.
US3688311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parabolic antennas
Assignee: Thales SA
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Filing: 1964-08-19
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Granted: 1972-08-29
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Expires: 1984-08-19
Abstract
Abstract An ultra high frequency antenna comprising a reflector having a focus and a focal plane, one radiating source at said focus and at least one radiating source in said focal plane, offset with respect to said focus, for illuminating said reflector, said sources producing at least two wave fronts of different directions and phase correcting means in the path of the wave front(s) originating from said offset source(s), said correcting means lying outside the path of said wave front originating from said source located at said focus.
Inventors
- 👤 Jacques Salmon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:56
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/42; H01Q1/421; H01Q15/00; H01Q15/02; H01Q15/12; H01Q15/14; H01Q15/22; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/195
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
An ultra high frequency antenna comprising a reflector having a focus and a focal plane, one radiating source at said focus and at least one radiating source in said focal plane, offset with respect to said focus, for illuminating said reflector, said sources producing at least two wave fronts of different directions and phase correcting means in the path of the wave front(s) originating from said offset source(s), said correcting means lying outside the path of said wave front originating from said source located at said focus.
Claim 2
Dependent Claim
87 words
An ultra high frequency antenna comprising a reflector having a focus and a focal plane, one radiating source at said focus and at least one radiating source in said focal plane, offset with respect to said focus, for illuminating said reflector, said sources producing at least two wave fronts of different directions and phase correcting means in the path of the wave front(s) originating from said offset source(s), said correcting means lying outside the path of said wave front originating from said source located at said focus.
Claim 3
Dependent Claim
27 words
An antenna as claimed in claim 1, wherein said phase correcting means comprise a lens located in the path of the waves radiated by said offset source(s).
Claim 4
Dependent Claim
64 words
An antenna as claimed in claim 1, wherein said phase correcting means comprise a second reflector having a planar portion for reflecting wave front oRiginating from said source located at said focus upon reflection thereof on said first mentioned reflector and at least a curved end portion for reflecting wave front(s) originating from said offset source(s) upon reflection thereof on said first mentioned reflector.
Claim 5
Dependent Claim
34 words
An antenna as claimed in claim 1, comprising a plurality of offset sources in said focal plane, said correcting means lying in the path of the wave fronts originating from said plurality of sources.
Claim 6
Dependent Claim
119 words
An antenna as claimed in claim 4, wherein said sources radiate waves polarized in a first direction, said phase correcting means comprise a second reflector having a planar portion for reflecting the wave front originating from said source located at said focus, upon reflection thereof on said first mentioned reflector, and curved end portions for reflecting the wave fronts originating from said plurality of offset sources upon reflection thereof on said first mentioned reflector, said first reflector comprises wires parallel to said first direction, said second reflector comprises parallel wires inclined at 45* to said first direction, a screen being disposed behind said second reflector, parallel thereto, at a distance equal to lambda /4, lambda being the operating wavelength.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |