US3761935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide angle microwave scanning antenna array with distortion correction means
Assignee: Republic Electronic Industries Inc
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Filing: 1972-03-06
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Granted: 1973-09-25
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Expires: 1992-03-06
Abstract
Abstract A wide angle microwave scanning antenna array includes an assembly of two stationary, parallel, concentric, spaced cylindrical surfaces providing a path for microwaves. A rotating waveguide feeds microwave energy into one end of the assembly and a flat focusing lens at the output end of the assembly radiates the microwaves in a scanning plane and focuses the waves at a point moving in the plane. A helical mirror in the assembly reflects the microwaves from the input to the lens at the output. To correct for distortion and increase the angular range of distortion free scanning, a cylindrical corrector lens is located in the assembly between the input and the mirror.
Inventors
- 👤 R Silbiger
- 👤 L Finch
- 👤 R Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:29
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/06; H01Q19/062; H01Q3/00; H01Q3/12; H01Q3/16; H01Q3/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
177 words
A wide angle microwave scanning antenna array, comprising an assembly of two stationary, concentrically spaced discontinuous cylindrically rolled members defining opposing curved surfaces for providing a path for microwaves therebetween, said assembly having an input end for receiving microwaves directed into said array in one direction between said surfaces from a moving waveguide source of said microwaves, said assembly having an output end extending in a generally tangential manner from the concentrically spaced members for radiating the received microwaves; a focusing lens disposed at said output end for focusing the radiated microwaves to a moving point in a scanning plane; a corrector lens disposed in said assembly for refracting in such a way microwaves entering said assembly so that distortion in focusing, amplitude and/or phase of microwaves radiated from the focusing lens is substantially prevented in an angular range exceeding 20* in said scanning plane; and a helical mirror disposed between said surfaces in said assembly and arranged to reflect microwaves leaving said corrector lens in said one direction to another direction parallel to said scanning plane.
Claim 2
Dependent Claim
177 words
A wide angle microwave scanning antenna array, comprising an assembly of two stationary, concentrically spaced discontinuous cylindrically rolled members defining opposing curved surfaces for providing a path for microwaves therebetween, said assembly having an input end for receiving microwaves directed into said array in one direction between said surfaces from a moving waveguide source of said microwaves, said assembly having an output end extending in a generally tangential manner from the concentrically spaced members for radiating the received microwaves; a focusing lens disposed at said output end for focusing the radiated microwaves to a moving point in a scanning plane; a corrector lens disposed in said assembly for refracting in such a way microwaves entering said assembly so that distortion in focusing, amplitude and/or phase of microwaves radiated from the focusing lens is substantially prevented in an angular range exceeding 20* in said scanning plane; and a helical mirror disposed between said surfaces in said assembly and arranged to reflect microwaves leaving said corrector lens in said one direction to another direction parallel to said scanning plane.
Claim 3
Dependent Claim
28 words
A wide angle microwave scanning antenna array as defined in Claim 1, wherein said corrector lens is cylindrically curved and has an index of refraction other than unity.
Claim 4
Dependent Claim
45 words
A wide angle microwave scanning antenna array as defined in claim 1, further comprising a source of said microwaves disposed adjacent said input end of said assembly; and means for rotating said source in a circular path in a plane perpendicular to said one direction.
Claim 5
Dependent Claim
22 words
A wide angle microwave scanning antenna array as defined in claim 1 wherein said mirror is integral with one of said surfaces.
Claim 6
Dependent Claim
40 words
A wide angle microwave scanning antenna array as defined in claim 1, wherein said focusing lens is flat and disposed parallel to said scanning plane, said corrector lens being cylindrically curved and disposed at said input end of said assembly.
Claim 7
Dependent Claim
20 words
A wide angle microwave scanning antenna array as defined in claim 1, said helical mirror having a pitch of 45*.
Claim 8
Dependent Claim
72 words
A wide angle microwave scanning antenna array as defined in claim 1, further comprising a pair of outer and inner cylindrical plates disposed in spaced concentric disposition, said surfaces being defined at the inner side of said outer plate and the outer side of said inner plate, said mirror being integral with one of said surfaces; and mechanical means for holding said plates in fixed radially spaced position with said mirror therebetween.
Claim 9
Dependent Claim
45 words
A wide angle microwave scanning antenna array as defined in claim 7 furthEr comprising a source of said microwaves disposed adjacent said input end of said assembly; and means for rotating said source in a circular path in a plane perpendicular to said one direction.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |