US3774222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide-angle planar-beam, antenna adapted for conventional or doppler scan using curved arrays
Assignee: TDK Micronas GmbH
•
Filing: 1972-11-30
•
Granted: 1973-11-20
•
Expires: 1992-11-30
Abstract
Abstract An antenna involving a plurality of linear arrays disposed about a surface of revolution formed about a horizontal axis by rotation of a double-ended hyperbolic curve. Each of the arrays follows a line conforming to that surface of revolution but lying entirely in a plane also containing the horizontal axis of the surface of revolution. The antenna elements of each array are excited from a transmission line such as a waveguide which is, in turn, fed from a centrally located parallel-plate waveguide planar beam generating arrangement. A conventional or Dopplerscan array provides the excitation for the so-called parallelplate waveguide converter. The radiated beam shape tends to hold its focus and therefore has uniform width in elevation over the full azimuth beamwidth at all useful elevation beam positions.
Inventors
- 👤 G Charlton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:29
CPC Classifications
H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q19/00; H01Q19/10; H01Q19/18; H01Q21/00; H01Q21/0006; H01Q21/0031; H01Q21/06; H01Q21/20; H01Q3/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
226 words
An antenna system for radiating planar beams scannable in a first angular coordinate and of substantially constant beam width in a second orthogonal angular coordinate, comprising: a plurality of first linear arrays each including a plurality of first antenna elements disposed along a surface of revolution about an axis Z, said surface of revolution having a variable radius R beginning at Ro and extending axially in both Z directions substantially in a curve defined by the equation R/Ro Cosh Z/Ro, said arrays being circumferentially spaced over a portion of said surface of revolution not exceeding 180* of the circumference thereof, each of said arrays following a curved line defined by the intersection of a plane also containing said axis, with said surface of revolution; feed means comprising a parallel plate waveguide having a semicircular aperture substantially of radius Ro, the parallel plates of said waveguide being oriented substantially normal to and within the inside of said surface of revolution; transition means comprising an energy coupling between each of said linear arrays and sAid feed means at the corresponding point of contact with said semi-circular parallel plate waveguide aperture; and means comprising a second linear array having a plurality of antenna elements located within said parallel plates, said second array extending substantially parallel to a diameter line of said semi-circle, to provide means capable of being scanned.
Claim 2
Dependent Claim
226 words
An antenna system for radiating planar beams scannable in a first angular coordinate and of substantially constant beam width in a second orthogonal angular coordinate, comprising: a plurality of first linear arrays each including a plurality of first antenna elements disposed along a surface of revolution about an axis Z, said surface of revolution having a variable radius R beginning at Ro and extending axially in both Z directions substantially in a curve defined by the equation R/Ro Cosh Z/Ro, said arrays being circumferentially spaced over a portion of said surface of revolution not exceeding 180* of the circumference thereof, each of said arrays following a curved line defined by the intersection of a plane also containing said axis, with said surface of revolution; feed means comprising a parallel plate waveguide having a semicircular aperture substantially of radius Ro, the parallel plates of said waveguide being oriented substantially normal to and within the inside of said surface of revolution; transition means comprising an energy coupling between each of said linear arrays and sAid feed means at the corresponding point of contact with said semi-circular parallel plate waveguide aperture; and means comprising a second linear array having a plurality of antenna elements located within said parallel plates, said second array extending substantially parallel to a diameter line of said semi-circle, to provide means capable of being scanned.
Claim 3
Dependent Claim
42 words
Apparatus according to claim 1 in which each of said first linear arrays includes a transmission line extending along the axial length of said surface of revolution and a plurality of antenna elements coupled thereto and disposed along said transmission line length.
Claim 4
Dependent Claim
37 words
Apparatus according to claim 2 in which said transmission lines associated with said first linear arrays are waveguide transmission lines and said first antenna elements are formed by slots in the walls of said waveguide transmission lines.
Claim 5
Dependent Claim
21 words
Apparatus according to claim 1 in which said slots in the walls of said waveguide transmission lines are spaced one-half wavelength.
Claim 6
Dependent Claim
44 words
Apparatus according to claim 3 in which said axis Z is substantially horizontal and said parallel-plates of said parallel-plate waveguide feed means are substantially vertical, said first angular coordinate thereby being elevation angle and said second orthogonal angular coordinate thereby being the azimuth plane.
References Cited (Backward Citations)
US3697998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |