US3636563A
Expired / Lapsed
US
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Aerial arrangements
Assignee: EMI Ltd
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Filing: 1969-05-13
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Granted: 1972-01-18
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Expires: 1989-05-13
Abstract
Abstract There is provided an aerial arrangement especially applicable to monopulse radar apparatus, comprising two interleaved arrays of aerials, the response of one array conforming to a sum pattern and the response of the other array conforming to a difference pattern, with output signals derived from the first array being in phase quadrature to output signals derived from the other array so that there is substantially no mutual coupling between the arrays. Preferably the interleaving of the arrays is sufficiently close that unwanted sidelobes do not appear, and the arrays comprise arrays of slotted waveguide aerials.
Inventors
- 👤 Robert Clement Laverick
- 👤 Peter Rothwell Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:43
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42; G01S13/44; G01S13/4409; H; H01; H01Q; H01Q25/00; H01Q25/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
An aerial arrangement comprising a first array of aerials adapted to have a response conforming to a sum pattern, and a second array of aerials interleaved with said first array and adapted to have a response conforming to a difference pattern and so that output signals derived from the second array are in phase quadrature to output signals derived from said first array, whereby there is substantially no mutual coupling between the arrays.
Claim 2
Dependent Claim
73 words
An aerial arrangement comprising a first array of aerials adapted to have a response conforming to a sum pattern, and a second array of aerials interleaved with said first array and adapted to have a response conforming to a difference pattern and so that output signals derived from the second array are in phase quadrature to output signals derived from said first array, whereby there is substantially no mutual coupling between the arrays.
Claim 3
Dependent Claim
22 words
An aerial arrangement according to claim 1 in which each of said arrays of aerials comprises an array of slotted waveguide aerials.
Claim 4
Dependent Claim
22 words
An aerial arrangement according to claim 1 in which each of said arrays of aerials comprises an array of slotted waveguide aerials.
Claim 5
Dependent Claim
17 words
An aerial arrangement according to claim 2 in which said slotted waveguide aerials comprise ridge waveguide aerials.
Claim 6
Dependent Claim
84 words
An aerial arrangement according to claim 1 further including means coupled to the arrangement for deriving a first signal from said first array due to a target, means coupled to the arrangement for deriving a further signal from said second array due to said target, and means for utilizing said first signal as a reference signal in conjunction with said further signal to determine the direction and magnitude of the offset of said target from the axis of the lobe of the sum pattern.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |