US4622559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paraboloid reflector antenna feed having a flange with tapered corrugations
Assignee: University of Manitoba
•
Filing: 1984-04-12
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Granted: 1986-11-11
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Expires: 2004-04-12
Abstract
Abstract The antenna feed includes a waveguide radiator with a conductive flange positioned about the waveguide near its radiating end. The flange includes one or more corrugations which each have tapered walls and which is truncated at its root and crest by a flat or curved plane. The corrugations thus may have a trapezoidal cross-section or a curved root and crest cross-section. The curvature may be sinusoidal.
Inventors
- 👤 Lotfollah Shafai
- 👤 Ahmed A. A. Kishk
- 👤 Ernest Bridges
- 👤 Apisak Ittipiboon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:07
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/06; H01Q13/065
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A feed for a paraboloid reflector antenna comprising: a circular waveguide having a longitudinal axis, a first end having an electrical coupler and a second radiating end; and a conductive flange surrounding the radiating end of the waveguide and perpendicular to the longitudinal axis of the waveguide, said conductive flange having at least one corrugation therein wherein the corrugation has walls each of which is tapered inward along the depth of the corrugation.
Claim 2
Dependent Claim
73 words
A feed for a paraboloid reflector antenna comprising: a circular waveguide having a longitudinal axis, a first end having an electrical coupler and a second radiating end; and a conductive flange surrounding the radiating end of the waveguide and perpendicular to the longitudinal axis of the waveguide, said conductive flange having at least one corrugation therein wherein the corrugation has walls each of which is tapered inward along the depth of the corrugation.
Claim 3
Dependent Claim
31 words
The feed for a paraboloid reflector antenna according to claim 1 wherein each tapered corrugation is truncated at its root and crest by flat planes, forming a trapezoidal shape in cross-section.
Claim 4
Dependent Claim
27 words
The feed for a paraboloid reflector antenna according to claim 2 wherein the flat planes are parallel to each other and perpendicular to the waveguide longitudinal axis.
Claim 5
Dependent Claim
21 words
The feed for a paraboloid reflector antenna according to claim 1 wherein each tapered corrugation has a sinusoidal profile in cross-section.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |