US3745577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable squint and beamwidth amplitude monopulse radar
Assignee: RTX Corp
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Filing: 1972-03-29
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Granted: 1973-07-10
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Expires: 1992-03-29
Abstract
Abstract In an amplitude monopulse radar, a cross coupling network between the respective feeds of a dual-radiator, angle measuring antenna array, couples energy from each feed into the other, with variable phase and amplitude adjustments to the energy coupled from one feed to the other feed, thereby providing, in effect, an artificial alteration in the intercoupling between the elements of the antenna array, in a manner to control the squint angle (or angle off of boresight) and beamwidth of the array.
Inventors
- 👤 I Goldmacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:02
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4409
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
An antenna feed system including a pair of transmission lines for respectively coupling a pair of spaced antenna radiating elements to corresponding channels in a conventional amplitude monopulse radar system, the improvement comprising: a pair of radar signal transmission paths, each coupling energy from one of said transmission lines into the other of said transmission lines, each including means to vary the phase and the amplitude of the electromagnetic energy coupled from one of said transmission lines into the other of said transmission lines, said phase and amplitude varying means adapted to vary the siGnals in said transmission lines in a manner to alter the individual radiation patterns of said radiating elements.
Claim 2
Dependent Claim
112 words
An antenna feed system including a pair of transmission lines for respectively coupling a pair of spaced antenna radiating elements to corresponding channels in a conventional amplitude monopulse radar system, the improvement comprising: a pair of radar signal transmission paths, each coupling energy from one of said transmission lines into the other of said transmission lines, each including means to vary the phase and the amplitude of the electromagnetic energy coupled from one of said transmission lines into the other of said transmission lines, said phase and amplitude varying means adapted to vary the siGnals in said transmission lines in a manner to alter the individual radiation patterns of said radiating elements.
Claim 3
Dependent Claim
15 words
The improvement according to claim 1 wherein said phase and amplitude varying means are adjustable.
Claim 4
Dependent Claim
29 words
The improvement according to claim 2 wherein said phase varying means comprises a ferrite core having an electrical coil thereon and means for adjusting the current in said coil.
Claim 5
Dependent Claim
30 words
The improvement according to claim 2 wherein said means for altering the amplitude of said electromagnetic signals comprises a dielectric vein rotatably disposed in respective ones of said transmission lines.
Claim 6
Dependent Claim
18 words
The improvement according to claim 1 wherein said transmission lines and said radar signal transmission paths comprise waveguides.
Claim 7
Dependent Claim
29 words
The improvement according to claim 5 wherein said cross coupling waveguides include a common wall with said feed waveguides, and coupling is achieved by apertures in said common wall.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |