US3898667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact frequency reuse antenna
Assignee: RCA Corp
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Filing: 1974-02-06
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Granted: 1975-08-05
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Expires: 1994-02-06
Abstract
Abstract A compact antenna system that permits orthogonally polarized frequency reuse operation is achieved by two overlapping parabolic reflectors. Each of the reflectors has a reflecting surface comprised of parallel, reflecting, conductive elements with the reflecting elements of one reflector polarized orthogonally to the reflecting elements in the other. Each reflector has an associated feed copolarized with the reflecting elements of the particular reflector. The two reflectors are overlaid without coinciding their respective focus points so that cross-polarized fields generated by the parallel elements in the surface of each reflector from its associated feed are scattered away from the copolarized beam of each reflector.
Inventors
- 👤 Anthony Rowland Raab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:29
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q19/00; H01Q19/10; H01Q19/12; H01Q19/17; H01Q25/00; H01Q25/001
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
227 words
A compact antenna arrangement for communicating electromagnetic waves with a first and second polarization separated by 90* from one another comprising: first and second electromagnetic wave reflectors, each of said reflectors comprising a portion of a parapoloid and having a resultant vertex, focus point and a focal axis, each of said reflectors having a plurality of parallel electromagnetic wave reflecting elements providing reflection of waves, the elements of one reflector being perpendicular to the elements of the other reflector, a first feed means located at the focus point of said first reflector and adapted to communicate electromagnetic waves polarized parallel to the reflecting elements of said first reflector to produce a copolarized beam in a first direction, a second feed means located at the focus point of said second reflector and adapted to communicate electromagnetic waves parallel to the reflecting elements of said second reflector to produce a copolarized beam in a second direction, and means for mounting said reflectors in an overlapping manner near the vertices with the focus points of said first and second reflectors sufficiently separated from one another, said vertices sufficiently non-overlapping and the focal axes sufficiently separated so that cross-polarized waves generated at either said first or said second reflectors in response to waves communicated with said first and second feeds respectively are scattered away from the copolarized beam of each reflector.
Claim 2
Dependent Claim
227 words
A compact antenna arrangement for communicating electromagnetic waves with a first and second polarization separated by 90* from one another comprising: first and second electromagnetic wave reflectors, each of said reflectors comprising a portion of a parapoloid and having a resultant vertex, focus point and a focal axis, each of said reflectors having a plurality of parallel electromagnetic wave reflecting elements providing reflection of waves, the elements of one reflector being perpendicular to the elements of the other reflector, a first feed means located at the focus point of said first reflector and adapted to communicate electromagnetic waves polarized parallel to the reflecting elements of said first reflector to produce a copolarized beam in a first direction, a second feed means located at the focus point of said second reflector and adapted to communicate electromagnetic waves parallel to the reflecting elements of said second reflector to produce a copolarized beam in a second direction, and means for mounting said reflectors in an overlapping manner near the vertices with the focus points of said first and second reflectors sufficiently separated from one another, said vertices sufficiently non-overlapping and the focal axes sufficiently separated so that cross-polarized waves generated at either said first or said second reflectors in response to waves communicated with said first and second feeds respectively are scattered away from the copolarized beam of each reflector.
Claim 3
Dependent Claim
30 words
The combination claimed in claim 1, wherein said reflectors are mounted with the vertex of each separated so that the focal axis of said first and second reflectors are parallel.
Claim 4
Dependent Claim
15 words
The combination claimed in claim 1, wherein said first and second directions are the same.
Claim 5
Dependent Claim
17 words
The combination of claim 1, wherein one of said reflectors overlaps substantially half of the other reflector.
Claim 6
Dependent Claim
17 words
The combination of claim 1, wherein said reflectors are formed of parallel metal wires embedded in dielectric.
Claim 7
Dependent Claim
219 words
An arrangement for communicating electromagnetic waves with a first and second polarization separated by 90* from one another comprising: first and second electromagnetic wave reflectors, each of said reflectors being portions of a parabola of revolution with the vertex being along the long edge of each of the reflectors and having a resultant focus point, each of said reflectors having a plurality of parallel electromagnetic wave reflecting elements providing reflection of waves, the elements of one reflector being perpendicular to the elements of the other reflector, a first feed means located at the focus of said first reflector and adapted to communicate electromagnetic waves polarized parallel to the reflecting elements of said first reflector to produce a copolarized Beam in a first direction, a second feed means located at the focus of said second reflector and adapted to communicate electromagnetic waves parallel to the reflecting elements of said second reflector to produce a copolarized beam in a second direction, and means for mountng said reflectors in an overlapping manner with the focus points of said first and second reflectors sufficiently separated from one another so that cross-polarized waves generated at either said first or said second reflectors in response to waves communicated with said first and second feeds respectively are scattered away from the copolarized beam of each reflector.
Claim 8
Dependent Claim
219 words
An arrangement for communicating electromagnetic waves with a first and second polarization separated by 90* from one another comprising: first and second electromagnetic wave reflectors, each of said reflectors being portions of a parabola of revolution with the vertex being along the long edge of each of the reflectors and having a resultant focus point, each of said reflectors having a plurality of parallel electromagnetic wave reflecting elements providing reflection of waves, the elements of one reflector being perpendicular to the elements of the other reflector, a first feed means located at the focus of said first reflector and adapted to communicate electromagnetic waves polarized parallel to the reflecting elements of said first reflector to produce a copolarized Beam in a first direction, a second feed means located at the focus of said second reflector and adapted to communicate electromagnetic waves parallel to the reflecting elements of said second reflector to produce a copolarized beam in a second direction, and means for mountng said reflectors in an overlapping manner with the focus points of said first and second reflectors sufficiently separated from one another so that cross-polarized waves generated at either said first or said second reflectors in response to waves communicated with said first and second feeds respectively are scattered away from the copolarized beam of each reflector.
Claim 9
Dependent Claim
19 words
The combination claimed in claim 6, wherein the region near the vertex of each of said reflectors is overlapped.
References Cited (Backward Citations)
US2991473A
Cited
US3267472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |