Patent US4121215A successfully refreshed from Google Patents.
US4121215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corner reflector antenna for DF and tracking applications
Assignee: United States Department of the Army
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Filing: 1972-08-04
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Granted: 1978-10-17
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Expires: 1992-08-04
Abstract
Abstract A corner reflecting antenna is truncated by a reflecting plate. Two rows ofipoles are placed near the throat of the corner reflector (but in front of reflecting plate) and aligned parallel to sides of the antenna. The dipoles are placed at locations that are near multiples of odd quarter-wavelengths from the truncated surfaces. Dipoles lie in the same plane parallel to the truncated surface and equidistant from the sides of the antenna. The rows of the dipoles fed separately by way of two power splitters, a phase shifter and a magic-tee.
Inventors
- 👤 Normand Barbano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:57
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/106; H01Q25/00; H01Q25/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
66 words
A corner reflector comprising first and second sides connected together at one end to form a throat of the corner reflector; a reflector plate mounted to said first and second sides near said throat and parallel to a line formed by the junction of said first and second sides to each other; and at least first and second dipoles mounted in front of the reflector plate.
Claim 2
Dependent Claim
66 words
A corner reflector comprising first and second sides connected together at one end to form a throat of the corner reflector; a reflector plate mounted to said first and second sides near said throat and parallel to a line formed by the junction of said first and second sides to each other; and at least first and second dipoles mounted in front of the reflector plate.
Claim 3
Dependent Claim
136 words
A reflector as set forth in claim 1 wherein said dipoles consists of first and second arrays of dipoles arranged in first and second rows parallel to the reflecting plate, the sides, and to each other; said reflecting plate truncating said reflector and forming first and second corners where they join said sides; said first row of dipoles being located one-quarter of a predetermined wavelength from said first corner and three-quarters of said wavelength from said second corner; said second row of dipoles being three-quarters of said wavelength from said first corner and one-quarter of said wavelength from said second corner; and the reflecting plate is located a distance from the line formed by the two sides joining which will prevent the formation of a trapped wave between the dipole and the throat of the antenna.
Claim 4
Dependent Claim
65 words
A reflector as set forth in claim 2 further comprising first and second power splitters connected respectively to said first and second row of dipoles; a magic-tee; a phase shifter; said magic-tee being connected directly to said first power splitter and connected through said phase shifter to said second power splitter; and said magic-tee being adapted to feed power or receive power from said dipoles.
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) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |