US3680143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped beam antenna
Assignee: Raytheon Co
•
Filing: 1970-07-01
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Granted: 1972-07-25
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Expires: 1990-07-01
Abstract
Abstract The apparatus of the present invention provides an antenna adapted to optimize the transmission or reception performance of a satellite subject to the usually encountered weight and volume constraints. The antenna features dual mode operation which provides two independent terminals, each providing the same gain pattern and polarization sense, but having differing senses of phase progression across the beam pattern. In addition, the beamwidth of the antenna is designed to cover a prescribed area on earth wherein minimum gain in this area is maximized rather than the gain at the beam center. The disclosed antenna system may also be used with a single reflector and two orthogonal polarizations, providing a total of four antenna terminals. To provide the second polarization which may be either crossed linear or counter rotating circular, each of the feeds must support the two polarizations, and the two pairs of terminals of a given polarization interconnected via individual hybrids.
Inventors
- 👤 James S Ajioka
- 👤 Harold A Rosen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:05
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/001; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17; Y; Y10; Y10S; Y10S343/00; Y10S343/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
187 words
A satellite antenna system comprising a parabolic reflector having a focal point; first, second, third and fourth feed horns disposed in the order named along a linear array in the region of said focal point facing said reflector; dual terminal means responsive to a signal at either terminal for generating first and second output signals at first and second output terminals, respectively, said first and second output signals being of equal power and having a 90* phase difference; first, second and third magic-T''s each having terminals 1, 2, 3, and 4, terminals 1 of said first and second magic-T''s being connected to said first and second output terminals, respectively, of said dual terminal means, terminals 2 and 3 of said second magic-T being connected to said second and third feed horns, respectively, terminals 2 and 3 of said first magic-T being connected to terminal 4 of said second and third magic-T''s, respectively, terminals 2 and 3 of said third magic-T being connected to said first and fourth feed horns, respectively; and means for terminating terminal 4 of said first magic-T and terminal 1 of said third magic-T.
Claim 2
Dependent Claim
187 words
A satellite antenna system comprising a parabolic reflector having a focal point; first, second, third and fourth feed horns disposed in the order named along a linear array in the region of said focal point facing said reflector; dual terminal means responsive to a signal at either terminal for generating first and second output signals at first and second output terminals, respectively, said first and second output signals being of equal power and having a 90* phase difference; first, second and third magic-T''s each having terminals 1, 2, 3, and 4, terminals 1 of said first and second magic-T''s being connected to said first and second output terminals, respectively, of said dual terminal means, terminals 2 and 3 of said second magic-T being connected to said second and third feed horns, respectively, terminals 2 and 3 of said first magic-T being connected to terminal 4 of said second and third magic-T''s, respectively, terminals 2 and 3 of said third magic-T being connected to said first and fourth feed horns, respectively; and means for terminating terminal 4 of said first magic-T and terminal 1 of said third magic-T.
Claim 3
Dependent Claim
18 words
The satellite antenna system as defined in claim 1 wherein said dual terminal means constitutes a 90* hybrid.
Claim 4
Dependent Claim
104 words
A dual mode, dual polarized satellite antenna system comprising a parabolic reflector having a focal point, means including first and second dual polarized feeds disposed in the region of said focal point facing said reflector and offset symmetrically from the axis of rotation thereof for generating overlapping field intensity patterns, means for feeding said first and second feeds with a first set of equal amplitude signals of 90* phase difference having a predetermined polarization, and means for feeding said first and second feeds with a second set of equal amplitude signals of 90* phase difference and of a polarization orthogonal to said predetermined polarization.
Claim 5
Dependent Claim
104 words
A dual mode, dual polarized satellite antenna system comprising a parabolic reflector having a focal point, means including first and second dual polarized feeds disposed in the region of said focal point facing said reflector and offset symmetrically from the axis of rotation thereof for generating overlapping field intensity patterns, means for feeding said first and second feeds with a first set of equal amplitude signals of 90* phase difference having a predetermined polarization, and means for feeding said first and second feeds with a second set of equal amplitude signals of 90* phase difference and of a polarization orthogonal to said predetermined polarization.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |