US3792480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerials
Assignee: Individual
•
Filing: 1968-12-31
•
Granted: 1974-02-12
•
Expires: 1988-12-31
Abstract
Abstract This disclosure relates to off-set or asymmetric aerial systems in which the main reflector which radiates into or receives from space a beam of energy is disposed to one side of the axis of the geometric body of which the main reflector forms part. The aerial system comprises a feed, a sub-reflector and a main relfector, the feed is displaced from the axis of the main reflector and the axis of the sub-reflector is transverse to the axis of the main reflector. This reduces the phenomena known as ''''bore-sight jitter'''' and ''''frequency sensitive squint.
Inventors
- 👤 R Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:59
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/192
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
An aerial system comprising a collimating main reflector, a sub reflector and a feed positioned relative to one another so that energy passing between the feed and the main reflector is reflected by the sub reflector and outwardly of the main reflector comprises a collimated beam, having its axis offset from the axis of the main reflector, the feed being displaced from and the axis of the sub reflector being positioned transversely to the axis of the main reflector by such amounts as to substantially eliminate boresight jitter, and frequency sensitive squint.
Claim 2
Dependent Claim
92 words
An aerial system comprising a collimating main reflector, a sub reflector and a feed positioned relative to one another so that energy passing between the feed and the main reflector is reflected by the sub reflector and outwardly of the main reflector comprises a collimated beam, having its axis offset from the axis of the main reflector, the feed being displaced from and the axis of the sub reflector being positioned transversely to the axis of the main reflector by such amounts as to substantially eliminate boresight jitter, and frequency sensitive squint.
Claim 3
Dependent Claim
23 words
An aerial system according to claim 1 in which the sub reflector and the main reflector are part hyperboloid and part paraboloid respectively.
Claim 4
Dependent Claim
34 words
An aerial system according to claim 2 in which the sub reflector has one focus coinciding with the focus of the main reflector and a second focus coinciding with the location of the feed.
Claim 5
Dependent Claim
103 words
An aerial system according to claim 3 in which the focal length of the main reflector is 100 units, the eccentricity of the sub reflector is 1.85, the region of the main reflector extends from 40 to 150 units from its axis measured in a direction normal thereto, the distance of the feed from the focus of the main reflector is 100 units, the feed is displaced from the axis of the main reflector by a 4* rotation about the main reflector focus and the feed is orientated to have a beam axis inclined at 15* with respect to the sub reflector axis.
Claim 6
Dependent Claim
14 words
An aerial system according to claim 4 in which the feed is a horn.
References Cited (Backward Citations)
US3332083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |