Patent US4146895A successfully refreshed from Google Patents.
US4146895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Geodesic lens aerial
Assignee: Commonwealth Scientific and Industrial Research Organisation
•
Filing: 1976-11-29
•
Granted: 1979-03-27
•
Expires: 1996-11-29
Abstract
Abstract A parallel plate geodesic lens aerial in the shape of a spherical cap or a flat disc, generates scanned planar radio beams. Commutated input signals to the lens are fed via output probes located around an arc of the perimeter of the lens to an arcuate array of radiating elements. The positional relationship between the power output from the lens and the power input to the array is 1:k, where k ≠ 1. Dielectric-filled geodesic lenses, power level and scanned beam accuracy monitoring, and complex modulation of the input power to enable simpler aerials to be realized, are described.
Inventors
- 👤 John P. Wild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:33
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/0006; H01Q21/0037; H01Q21/0043; H01Q21/005; H01Q21/0056; H01Q21/0031; H01Q3/00; H01Q3/24; H01Q3/245
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A scanning beam aerial system comprising (a) a microwave feed system consisting of a parallel plate, geodesic lens in the shape of a spherical cap having opposed arcuate arrays of input and output probes located around the edge of the geodesic lens, (b) a circular or arcuate array of radiating elements, and (c) means for connecting power from said lens output probes to said radiating array by a linear angular transformation 1:k, where k ≠ 1.
Claim 2
Dependent Claim
76 words
A scanning beam aerial system comprising (a) a microwave feed system consisting of a parallel plate, geodesic lens in the shape of a spherical cap having opposed arcuate arrays of input and output probes located around the edge of the geodesic lens, (b) a circular or arcuate array of radiating elements, and (c) means for connecting power from said lens output probes to said radiating array by a linear angular transformation 1:k, where k ≠ 1.
Claim 3
Dependent Claim
15 words
A scanning beam aerial system as defined in claim 1, in which k < 1.
Claim 4
Dependent Claim
64 words
A scanning beam aerial system as defined in claim 1, in which the entire array of radiating elements is illuminated for radiation in the boresight direction, the array illumination for radiation in other directions consequently being asymmetrical, complex modulation of the RF power supplied to input probes being used to correct the asymmetrical illumination and reduce the side lobe levels introduced by that asymmetry.
Claim 5
Dependent Claim
36 words
A scanning beam aerial system as defined in claim 1, in which the level of power supplied to the output probes of the geodesic lens is sampled using a probe centrally located on the geodesic lens.
Claim 6
Dependent Claim
92 words
A scanning beam aerial system as defined in claim 1, in which, to monitor the accuracy of the scanned beam generated by the aerial system, a sector of an annular parallel plate lens, having an inner radius substantially half the radius of the arcs of input and output probes, is loosely coupled to the edge of the geodesic lens over at least that part of the edge of the geodesic lens which contains the output probes, and means for sampling power is provided at the half-radius of said annular parallel plate lens.
Claim 7
Dependent Claim
28 words
A scanning beam aerial system as defined in claim 1, in which the space between the parallel plates of the geodesic lens is filled with a dielectric material.
Claim 8
Dependent Claim
18 words
A scanning beam aerial system as defined in claim 1, in which the radiating elements are column radiators.
References Cited (Backward Citations)
US3916415A
Cited
US3343171A
Cited
US3392394A
Cited
US3508275A
Cited
US3921176A
Cited
US3964069A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-26 | 1982-09-25 | 1983-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-26 | 1986-09-25 | 1987-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-26 | 1990-09-25 | 1991-03-27 | $7700.00 | Window Closed / Lapsed |