US3766561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution aircraft radar antenna
Assignee: United States Department of the Navy
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Filing: 1969-12-30
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Granted: 1973-10-16
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Expires: 1989-12-30
Abstract
Abstract A high resolution aircraft radar antenna having a pair of long alternately activated radio frequency (RF) antenna arrays in back-to-back relation within an elliptical cross-sectional boom of good aerodynamic characteristics supported on a retractable mounting from an aircraft and capable of producing slow boom rotation beneath the aircraft in the extended condition and streamlined with the fuselage in the retracted position for low drag to provide 360* radar search scanning and tracking operation.
Inventors
- 👤 F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:35
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/02; H01Q3/04; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/42; H01Q1/428; H01Q25/00; H01Q25/005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
153 words
A high resolution aircraft radar antenna that is extendible for rotation and retractable for low drag storage on an aircraft comprising: a pair of elongated antenna arrays supported together in backto-back relation on a beam; an elongated elliptical shell housing said pair of antennas and supported on said beam with the two edges of short radii being of dielectric material to provide opposite microwave windows for said pair of antenna arrays therein, said shell having a central support on one long radius of curvature attachable to an aircraft for controlled retraction, extension and rotation thereof; and a switching circuit coupled between said pair of antenna arrays and a radar transmitter and receiver to alternately activate said pair of antenna arrays whereby support of said central support on an aircraft for retraction, extension and rotation of said pair of antenna arrays activated alternately provides two scans 180* apart per revolution of said antenna arrays.
Claim 2
Dependent Claim
153 words
A high resolution aircraft radar antenna that is extendible for rotation and retractable for low drag storage on an aircraft comprising: a pair of elongated antenna arrays supported together in backto-back relation on a beam; an elongated elliptical shell housing said pair of antennas and supported on said beam with the two edges of short radii being of dielectric material to provide opposite microwave windows for said pair of antenna arrays therein, said shell having a central support on one long radius of curvature attachable to an aircraft for controlled retraction, extension and rotation thereof; and a switching circuit coupled between said pair of antenna arrays and a radar transmitter and receiver to alternately activate said pair of antenna arrays whereby support of said central support on an aircraft for retraction, extension and rotation of said pair of antenna arrays activated alternately provides two scans 180* apart per revolution of said antenna arrays.
Claim 3
Dependent Claim
60 words
A high resolution aircraft radar antenna as set forth in claim 1 wherein said support of said shell on said beam includes ribs placed radially along the longitudinal length of said shell interior between array waveguide openings and fixed to said beam with microwave lenses supported in said shell between said ribs and said dielectric material providing microwave transmission therethrough.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |