Patent US3720947A successfully refreshed from Google Patents.
US3720947A
Expired / Lapsed
US
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Polarization device for radar antenna
Assignee: United States Department of the Navy
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Filing: 1963-12-30
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Granted: 1973-03-13
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Expires: 1983-12-30
Abstract
Abstract Apparatus for selectively changing the operation of radar antennas to work in either a linear polarization mode, a lefthand circular polarization mode, or a right-hand circular polarization mode.
Inventors
- 👤 W Meyer
- 👤 J Staehlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:21
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/24; H01Q21/245
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
In a radar antenna system having a rotatable feedhorn, a polarization selector comprising: a tubular housing having a flange portion with a plurality of catch surfaces, said tubular housing being rotatably mounted within said feedhorn, a quarter-wave plate positioned within said tubular housing, a ring stationarily mounted relative to and within said feedhorn, first, second, and third latches pivotally mounted to said ring, and means for selectively pivotally actuating said latches.
Claim 2
Dependent Claim
71 words
In a radar antenna system having a rotatable feedhorn, a polarization selector comprising: a tubular housing having a flange portion with a plurality of catch surfaces, said tubular housing being rotatably mounted within said feedhorn, a quarter-wave plate positioned within said tubular housing, a ring stationarily mounted relative to and within said feedhorn, first, second, and third latches pivotally mounted to said ring, and means for selectively pivotally actuating said latches.
Claim 3
Dependent Claim
71 words
In a radar antenna system having a rotatable feedhorn, a polarization selector comprising: a tubular housing having a flange portion with a plurality of catch surfaces, said tubular housing being rotatably mounted within said feedhorn, a quarter-wave plate positioned within said tubular housing, a ring stationarily mounted relative to and within said feedhorn, first, second, and third latches pivotally mounted to said ring, and means for selectively pivotally actuating said latches.
Claim 4
Dependent Claim
71 words
In a radar antenna system having a rotatable feedhorn, a polarization selector comprising: a tubular housing having a flange portion with a plurality of catch surfaces, said tubular housing being rotatably mounted within said feedhorn, a quarter-wave plate positioned within said tubular housing, a ring stationarily mounted relative to and within said feedhorn, first, second, and third latches pivotally mounted to said ring, and means for selectively pivotally actuating said latches.
Claim 5
Dependent Claim
41 words
In a radar antenna system having a rotatable feedhorn, a polarization selector as set forth in claim 1 wherein said second latch is slidably connected to said first latch whereby actuation of said second latch causes actuation of said first latch.
Claim 6
Dependent Claim
49 words
In a radar antenna system having a rotatable feedhorn, a polarization selector as set forth in claim 2 wherein said means for selectively pivotally actuating said latches comprises a first pair of electromagnets for actuating said second latch and a second pair of electromagnets for actuating said third latch.
References Cited (Backward Citations)
US2995717A
Cited
US3024463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |