Patent DE4333391C1 successfully refreshed from Google Patents.
US3683387A
Expired / Lapsed
US
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Compact scanning radar antenna
Assignee: United States Department of the Army
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Filing: 1970-12-28
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Granted: 1972-08-08
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Expires: 1990-12-28
Abstract
Abstract Disclosed are radar sectoral horn antennas of the rolled and folded parallel plate type having two internal reflectors which makes possible a more compact construction. The double fold or double reflector construction is applicable to sectoral horns having an f/d ratio greater than one and the reflectors may be straight or curved. The horns may be provided with a dielectric, geodesic or wave guide lens and by combining two orthogonally related antennas, three dimensional scanning is possible.
Inventors
- 👤 James M Meek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:29
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A sectoral horn antenna having rolled and folded paralleled spaced plates comprising: an inlet aperture formed by a rolled portion of the plates; a first internal linear reflector formed by a folded strip joining the edges of the rolled portion of the plates, a second internal substantially parabolic reflector formed by a folded strip joining the edges of the flat portion of the plates; and an outlet aperture formed in a further rolled portion of the plates.
Claim 2
Dependent Claim
77 words
A sectoral horn antenna having rolled and folded paralleled spaced plates comprising: an inlet aperture formed by a rolled portion of the plates; a first internal linear reflector formed by a folded strip joining the edges of the rolled portion of the plates, a second internal substantially parabolic reflector formed by a folded strip joining the edges of the flat portion of the plates; and an outlet aperture formed in a further rolled portion of the plates.
Claim 3
Dependent Claim
34 words
The structure of claim 1 wherein the antenna has a focal length identified as f, and wherein the width of the outlet aperture is identified as d, the ratio f/d being greater than one.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |