US3633209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Offset paraboloid-plane reflector antenna
Assignee: Individual
•
Filing: 1969-09-05
•
Granted: 1972-01-04
•
Expires: 1989-09-05
Abstract
Abstract A microwave antenna assembly which includes a second reflector in the form of an asymmetrical portion of a paraboloid and a main reflector in the form of a generally flat planar surface which forms an acute angle with the second reflector. A radiating or receiving device is located at the focal point of the paraboloid spaced from but in proximity to the end of the main reflector remote from the second reflector.
Inventors
- 👤 Mostafa S Afifi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:11
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/18; H01Q19/19; H01Q19/191; H01Q19/104
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
93 words
A microwave antenna assembly comprising a main reflector in the form of a flat planar surface, a second reflector iN the form of an asymmetrical portion of a paraboloid, means for supporting said main reflector relative to said second reflector so that said main reflector and said second reflector are joined together in a continuous surface at a generally acute angle therebetween and a radiating or receiving means located at the focal point of said second reflector situated near the edge of said main reflector opposite the end joined to the second reflector.
Claim 2
Dependent Claim
93 words
A microwave antenna assembly comprising a main reflector in the form of a flat planar surface, a second reflector iN the form of an asymmetrical portion of a paraboloid, means for supporting said main reflector relative to said second reflector so that said main reflector and said second reflector are joined together in a continuous surface at a generally acute angle therebetween and a radiating or receiving means located at the focal point of said second reflector situated near the edge of said main reflector opposite the end joined to the second reflector.
Claim 3
Dependent Claim
15 words
A microwave antenna as claimed in claim 1 wherein said second reflector is relatively shallow.
Claim 4
Dependent Claim
64 words
A microwave antenna assembly as claimed in claim 2 wherein the depth of d of said second reflector lies in range 0.05< d< 0.1, wherein the depth d is the ratio of h, the perpendicular distance between a plane determined by the edge of said second reflector and the nadir point of the second reflector, and F, the focal length of said second reflector.
Claim 5
Dependent Claim
53 words
A microwave antenna assembly as claimed in claim 3 wherein the edge ratio determined by the formula K(1-d)(1+ d) 1((p+ 1)K 2-Jp 2(K)/Jp 1(K))+(1+ d) 1(d(p-1)-(p+ 1))wherein K is the argument of the Bessel coefficient and is approximately equal to 3.5 and p is an arbitrary number which takes a value near unity.
Claim 6
Dependent Claim
44 words
A microwave antenna assembly as claimed in claim 1 wherein said radiating or receiving means comprises an ellipsoidal subreflector having a focal point coinciding with the focal point of said second reflector and a horn located behind said main reflector for feeding said subreflector.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |