US4047180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband corrugated horn antenna with radome
Assignee: General Dynamics Government Systems Corp
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Filing: 1976-06-01
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Granted: 1977-09-06
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Expires: 1996-06-01
Abstract
Abstract A broadband (8-18 GHz) radomed horn antenna system comprises a conical horn having broadband slots on the inner surface and a radome having a frusto-conical side wall and a spherically shaped transverse wall inserted into the horn. The radome wall is thin relative to operating wavelength. The radome side wall fits snugly against the inner surface of the horn wall so that transverse wall is proximate to the horn feed port with its convex side facing toward the horn aperture. The cylindrical feed guide contains a higher order hybrid mode suppressor which maintains a substantially uniform radiation pattern over the operating band with an acceptable insertion loss.
Inventors
- 👤 Samuel Chung-Shu Kuo
- 👤 William D. Rosser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:34
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/06; H01Q19/08; H01P; H01P1/00; H01P1/16; H01Q1/00; H01Q1/42; H01Q13/00; H01Q13/02; H01Q13/0208
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
An antenna system operable over a wide frequency range comprising a conical corrugated horn antenna having an inner surface formed broadband slots and having an aperture and a feed port, a radome on said antenna, said radome having a frustoconical portion adjacent to the inner surface of said horn with an outer end coincident with said aperture and an inner end proximate to said feed port, said radome also having a spherically-shaped transverse wall across said inner end, the convex side of said wall facing the outer end of said radome, waveguide means connected to said port, said waveguide means comprising a ridged rectangular waveguide, a tapered transition waveguide connected to said ridged waveguide, and a cylindrical waveguide connected between said transition waveguide and said feed port of the horn, and hybrid mode suppressor means disposed within said cylindrical waveguide whereby to suppress higher order hybrid wave modes in said horn and correspondingly increase its operating bandwidth.
Claim 2
Dependent Claim
157 words
An antenna system operable over a wide frequency range comprising a conical corrugated horn antenna having an inner surface formed broadband slots and having an aperture and a feed port, a radome on said antenna, said radome having a frustoconical portion adjacent to the inner surface of said horn with an outer end coincident with said aperture and an inner end proximate to said feed port, said radome also having a spherically-shaped transverse wall across said inner end, the convex side of said wall facing the outer end of said radome, waveguide means connected to said port, said waveguide means comprising a ridged rectangular waveguide, a tapered transition waveguide connected to said ridged waveguide, and a cylindrical waveguide connected between said transition waveguide and said feed port of the horn, and hybrid mode suppressor means disposed within said cylindrical waveguide whereby to suppress higher order hybrid wave modes in said horn and correspondingly increase its operating bandwidth.
Claim 3
Dependent Claim
17 words
The antenna system according to claim 1 in which said mode suppressor means comprises a resistance card.
Claim 4
Dependent Claim
15 words
The antenna system according to claim 2 in which said resistance card is cylindrically shaped.
Claim 5
Dependent Claim
24 words
The antenna system according to claim 2 in which said transverse wall is spaced from said port toward said outer end of the radome.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |