US4309709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual frequency aerial feed arrangements
Assignee: BAE Systems Integrated System Technologies Ltd
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Filing: 1980-07-30
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Granted: 1982-01-05
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Expires: 2000-07-30
Abstract
Abstract The invention provides a dual frequency aerial feed arrangement consisting of a main feed horn having on either side of its mouth ground plane members above which are mounted dipole radiators. The ground members are set back from the mouth of the horn and carry upstanding plates extending to a plane including the mouth of the horn the plates providing a corrugation effect with the corrugations aligned with the polarization of the dipole radiators.
Inventors
- 👤 Stewart C. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:26
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/001; H01Q5/00; H01Q5/40; H01Q5/45
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A dual frequency aerial feed arrangement comprising a main feed horn for propagating energy at a first frequency and having a first direction of polarization, said feed horn having a longitudinal axis and an open mouth at one end transverse to said longitudinal axis; a pair of ground plane members extending from opposite sides of said feed horn, said members being located in a first plane parallel to the mouth of said feed horn and spaced therefrom along said longitudinal axis; a pair of dipole radiators for propagating energy at a second frequency and having a second direction of polarization orthogonal to said first direction of polarization, one of said dipole radiators being mounted on each of said ground plane members; and a plurality of upstanding parallel plates attached to said ground plane members and extending therefrom, the edges of said plates defining a second plane including the mouth of said feed horn, said arrangement minimizing excitation of said ground plane members by energy from said main feed horn thereby reducing the radiation angle of said feed horn.
Claim 2
Dependent Claim
178 words
A dual frequency aerial feed arrangement comprising a main feed horn for propagating energy at a first frequency and having a first direction of polarization, said feed horn having a longitudinal axis and an open mouth at one end transverse to said longitudinal axis; a pair of ground plane members extending from opposite sides of said feed horn, said members being located in a first plane parallel to the mouth of said feed horn and spaced therefrom along said longitudinal axis; a pair of dipole radiators for propagating energy at a second frequency and having a second direction of polarization orthogonal to said first direction of polarization, one of said dipole radiators being mounted on each of said ground plane members; and a plurality of upstanding parallel plates attached to said ground plane members and extending therefrom, the edges of said plates defining a second plane including the mouth of said feed horn, said arrangement minimizing excitation of said ground plane members by energy from said main feed horn thereby reducing the radiation angle of said feed horn.
Claim 3
Dependent Claim
24 words
An arrangement as claimed in claim 1 wherein the distance between said first and second planes yields an open circuit at said second plane.
Claim 4
Dependent Claim
36 words
An arrangement as claimed in claim 1 or 2 wherein the distance between each of said upstanding parallel plates is the same, said distance being less than one-half of the wavelength corresponding to said second frequency.
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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |