US3568204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multimode antenna feed system having a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn
Assignee: GTE Sylvania Inc
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Filing: 1969-04-29
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Granted: 1971-03-02
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Expires: 1989-04-29
Abstract
Abstract An antenna feed system employing a plurality of tracking elements mounted symmetrically about the inner walls and at the aperture end of a scalar horn. The tracking elements have a single axis of directivity coincident with the axis of directivity of the scalar horn.
Inventors
- 👤 Leonard L Blaisdell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:12
CPC Classifications
H; H01; H01Q; H01Q25/00; H01Q25/02; H01Q13/00; H01Q13/02; H01Q13/0208
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
142 words
In an antenna system including a reflector assembly, an antenna feed apparatus comprising: a scalar feed horn assembly positioned in an electromagnetic wave propagation arrangement with the reflector assembly and having a throat end and an aperture end, said feed horn assembly being operative in response to an input signal at said throat end to illuminate said reflector assembly and to generate a first confined field having an axis of directivity; a plurality of tracking elements for providing a second confined field in response to an input signal, said confined field having a plurality of directional zones; and means for mounting said plurality of tracking elements symmetrically about the inside wall and at the aperture end of said scalar horn assembly with the axis of directivity of said second confined field coincident with the axis of directivity of said scalar horn assembly.
Claim 2
Dependent Claim
142 words
In an antenna system including a reflector assembly, an antenna feed apparatus comprising: a scalar feed horn assembly positioned in an electromagnetic wave propagation arrangement with the reflector assembly and having a throat end and an aperture end, said feed horn assembly being operative in response to an input signal at said throat end to illuminate said reflector assembly and to generate a first confined field having an axis of directivity; a plurality of tracking elements for providing a second confined field in response to an input signal, said confined field having a plurality of directional zones; and means for mounting said plurality of tracking elements symmetrically about the inside wall and at the aperture end of said scalar horn assembly with the axis of directivity of said second confined field coincident with the axis of directivity of said scalar horn assembly.
Claim 3
Dependent Claim
47 words
An antenna feed apparatus according to claim 1 further including means connected to a pair of said plurality of tracking elements for combining substantially in phase opposition a radiofrequency signal received from opposing zones thereby to produce a resultant energy signal for each pair of opposing zones.
Claim 4
Dependent Claim
24 words
An antenna feed apparatus according to claim 1 wherein said plurality of tracking elements includes four helical antenna elements each having a predetermined gain.
Claim 5
Dependent Claim
117 words
An antenna feed apparatus according to claim 3 wherein means for mounting includes for each of said plurality of tracking elements a base member of a low loss dielectric material having one end fixedly mounted to the inner wall of said scalar horn assembly and the other end having a cylindrical opening, the centerline of which is parallel to the axis of directivity of said plurality of helical antenna elements and the diameter of which is sufficient to accept one of said helical tracking elements, said base member extending radially inward such that the centerline of the cylindrical opening is a predetermined distance from the axis of directivity of the first confined field of said horn assembly.
Claim 6
Dependent Claim
64 words
An antenna feed apparatus according to claim 4 wherein the predetermined gain for each of said helical antenna Elements is substantially 11.5 db and wherein the predetermined distance that the centerline of the cylindrical opening is located from the axis of directivity of said scalar horn assembly is substantially equal to 3.72 lambda where lambda is the free space wavelength of the input signal.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |