US4636798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave lens for beam broadening with antenna feeds
Assignee: SEAVEY ENGINEERING ASSOCIATES Inc
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Filing: 1984-05-29
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Granted: 1987-01-13
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Expires: 2004-05-29
Abstract
Abstract A microwave lens broadens the radiation pattern of an antenna feedhorn so as to result in improved illumination of the reflector surface. The lens, constructed of dielectric material in the shape of a half-torus, provides feed radiation patterns suitable for use with deep paraboloidal reflectors, typically ones having focal-length-to-diameter ratios between 0.25 and 0.35.
Inventors
- 👤 John M. Seavey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:47
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/06; H01Q13/065; H01Q19/00; H01Q19/06; H01Q19/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
61 words
Apparatus for broadening the radiation pattern of a waveguide horn comprising, a circular waveguide horn formed with a circular aperture, a dielectric lens having rotational symmetry and shaped in the form of a torus cut in half, said lens being formed of low-loss dielectric material, said lens being located over and coaxial with said circular aperture of said circular waveguide horn.
Claim 2
Dependent Claim
61 words
Apparatus for broadening the radiation pattern of a waveguide horn comprising, a circular waveguide horn formed with a circular aperture, a dielectric lens having rotational symmetry and shaped in the form of a torus cut in half, said lens being formed of low-loss dielectric material, said lens being located over and coaxial with said circular aperture of said circular waveguide horn.
Claim 3
Dependent Claim
22 words
Apparatus as described in claim 1 wherein said circular waveguide horn is formed with grooves or corrugations forming a flat (180°) flare.
Claim 4
Dependent Claim
22 words
Apparatus as described in claim 1 wherein said circular waveguide horn is formed with grooves or corrugations forming a conical flare angle.
Claim 5
Dependent Claim
22 words
Apparatus as in claim 1 wherein said circular horn is formed with an opening of diameter of the order of 0.75 wavelength.
Claim 6
Dependent Claim
80 words
Apparatus for broadening the radiation pattern of a waveguide horn in accordance with claim 1 wherein said dielectric lens comprises two contiguous sections, a first of which is characterized by an inner diameter approximately equal to the diameter of said circular aperture and a second section axially displaced from said first section having an outer diameter greater than said inner diameter, said second section being characterized by a semicircular cross section in a plane including the axis of said lens.
Claim 7
Dependent Claim
26 words
Apparatus for broadening the radiation pattern of a waveguide horn in accordance with claim 5 wherein said outer diameter is approximately 2.3 times said inner diameter.
Claim 8
Dependent Claim
26 words
Apparatus for broadening the radiation pattern of a waveguide horn in accordance with claim 5 wherein said outer diameter is approximately three times said inner diameter.
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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |