US4388623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antennas
Assignee: BAE Systems Electronics Ltd
•
Filing: 1980-06-26
•
Granted: 1983-06-14
•
Expires: 2000-06-26
Abstract
Abstract The invention provides an antenna having a large area reflector formed of a plurality of conductive slats of carbon fibre re-inforced plastics material having air gaps therebetween. The slats are mounted on a supporting and shaping framework which is of like material. The supporting and shaping framework is carried on a support structure of aluminium and between the aluminium and the support structure and the carbon fibre reinforced plastics material of the supporting and shaping framework is provided the intermediary material (e.g. titanium or stainless steel provided to reduce the effects of electrolytic corrosion.
Inventors
- 👤 Richard W. Crook
- 👤 Ian Coghill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:34
CPC Classifications
H; H01; H01Q; H01Q15/00; H01Q15/14; H01Q15/16; H01Q15/22; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17; H01Q19/175
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
44 words
An antenna having a relatively large area reflector formed of a plurality of conductive slats having air gaps therebetween wherein said slats are formed of carbon fibre re-inforced plastics material, with said material providing the reflective surfaces of said slats for energy incident thereupon.
Claim 2
Dependent Claim
44 words
An antenna having a relatively large area reflector formed of a plurality of conductive slats having air gaps therebetween wherein said slats are formed of carbon fibre re-inforced plastics material, with said material providing the reflective surfaces of said slats for energy incident thereupon.
Claim 3
Dependent Claim
27 words
An antenna as claimed in claim 1 wherein said reflector is a single curvature parabolic reflector, and said slats are linear and extend in an axial direction.
Claim 4
Dependent Claim
17 words
A marine radar antenna as claimed in claim 1 provided to be scanable and mast head mounted.
Claim 5
Dependent Claim
28 words
An antenna as claimed in claim 1 wherein a supporting and shaping framework to which said slats are mounted is also comprised of carbon fibre re-inforced plastics material.
Claim 6
Dependent Claim
48 words
An antenna as claimed in claim 4 wherein said framework consists of a plurality of contoured back plates extending transversely to said slats, said contoured back plates having surfaces to which said slats are attached which surfaces are shaped in accordance with the desired shape of said reflector.
Claim 7
Dependent Claim
45 words
An antenna as claimed in claim 5 wherein said contoured back plates are mechanically linked independently of said slats by at least two members extending in the same direction as said slats, said last mentioned members being fixed to each of said contoured back plates.
Claim 8
Dependent Claim
29 words
An antenna as claimed in claim 6 wherein said last mentioned at least two members are tubular members passing through at least intermediary one of said contoured back plates.
Claim 9
Dependent Claim
75 words
An antenna as claimed in claim 4 wherein said reflector with its supporting and shaping framework is mounted onto an aluminium support structure which forms part of a pedestal for said antenna via the intermediary of a material which reduces the effects of electrolytic corrosion compared to the effects which would otherwise be experienced if the carbon fibre re-inforced plastics material of said supporting and shaping framework were connected directly to said aluminium support structure.
Claim 10
Dependent Claim
13 words
An antenna as claimed in claim 8 wherein said intermediary material is titanium.
Claim 11
Dependent Claim
14 words
An antenna as claimed in claim 8 wherein said intermediary material is stainless steel.
Claim 12
Dependent Claim
64 words
An antenna as claimed in claim 8 wherein a number of said contoured back plates are extended beyond said slats towards said support structure and said support structure has a like number of posts aligned with and extending towards said extended contoured back plates, said posts and said extended contoured back plates being fixed together by means of fish plates of said intermediary material.
Claim 13
Dependent Claim
23 words
An antenna as claimed in claim 11 wherein the adjacent ends of the contoured back plates and said posts are merely spaced apart.
Claim 14
Dependent Claim
35 words
An antenna as claimed in claim 11 wherein between each end of a contoured back plate and the corresponding end of a post, a pad acting as a barrier of said intermediary material is provided.
Claim 15
Dependent Claim
32 words
An antenna as claimed in claim 1 wherein said reflector is arranged to be fed by an array of radio horns extending parallel to and adjacent one longitudinal edge of said reflector.
Claim 16
Dependent Claim
55 words
An antenna as claimed in claim 14 wherein a series of further slats of progressively decreasing lengths extend from said longitudinal edge so as to form a skirt tending to screen the space which would otherwise exist between said array of horns and said longitudinal edge of said reflector whereby to reduce spurious scattered radiations.
References Cited (Backward Citations)
US2605413A
Cited
US2495219A
Cited
US2598475A
Cited
US2769170A
Cited
US3716869A
Cited
US4020202A
Cited
US4134120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |