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Patent US4238797A successfully refreshed from Google Patents.
US4238797A
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Multi-beam antenna controller
Assignee: United States Department of the Army
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Filing: 1979-05-25
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Granted: 1980-12-09
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Expires: 1999-05-25
Abstract
Abstract An optical processor antenna controller for controlling a plurality of be emitted from an array antenna. The beams may be emitted simultaneously or sequentially, and control is by a plurality of coherent light beams.
Inventors
- 👤 James S. Shreve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:28
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q3/00; H01Q3/24; H01Q3/26; H01Q3/2676
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A multi-beam optical processor antenna controller for controlling an array antenna, comprising, means for emitting a coherent light beam means for splitting said coherent light beam into a plurality of beams, a different transparency means disposed in each of said plurality of beams, each of said transparency means having a selected transmittance pattern, a lens means disposed behind each of said transparencies for taking the Fourier transform of the beam which passes through that transparency, means for combining said plurality of beams after said Fourier transforms have been taken, means for providing electrical signals corresponding to the amplitude and/or phase of a plurality of spatially displaced samples of said combined beam, said samples corresponding in relative spacing to the spacing of the elements of said array antenna, and, means for exciting the elements of said array antenna with said electrical signals.
Claim 2
Dependent Claim
141 words
A multi-beam optical processor antenna controller for controlling an array antenna, comprising, means for emitting a coherent light beam means for splitting said coherent light beam into a plurality of beams, a different transparency means disposed in each of said plurality of beams, each of said transparency means having a selected transmittance pattern, a lens means disposed behind each of said transparencies for taking the Fourier transform of the beam which passes through that transparency, means for combining said plurality of beams after said Fourier transforms have been taken, means for providing electrical signals corresponding to the amplitude and/or phase of a plurality of spatially displaced samples of said combined beam, said samples corresponding in relative spacing to the spacing of the elements of said array antenna, and, means for exciting the elements of said array antenna with said electrical signals.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 further including means for independently producing a null in the composite pattern emitted by said array antenna.
Claim 4
Dependent Claim
61 words
The apparatus of claim 2 wherein said means for producing a null comprises a reflective means having an absorptive spot at the position of said null, said combined beam being reflected off of said reflective means before being inputted to said means for providing electrical signals, and a lens means being disposed between said means for combining and said reflective means.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3 wherein there is a shutter means disposed in each of said plurality of beams.
References Cited (Backward Citations)
US3878520A
Cited
US4028702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |