US4376941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antenna cable
Assignee: United States Department of the Navy
•
Filing: 1970-01-29
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Granted: 1983-03-15
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Expires: 1990-01-29
Abstract
Abstract A distributed loop antenna is embodied in a flexible cable structure for marine E.L.F. (extremely low frequency) radio reception. Several distributed loop and magnetic core configurations which provide "side-looking" reception are described, as is the ability of flexible distributed loops to minimize the induction of noise voltages in the antenna.
Inventors
- 👤 Joseph A. Zenel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:43
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A flexible antenna cable structure adapted to be streamed aft from a submarine for use in E.L.F. radio reception, said antenna cable structure comprising: a flexible, metallic, central strength member; a first layer overlying said strength member and formed of a flexible, electrically insulating, waterproof material; a second layer overlying said first layer and formed of a resilient, electrically insulating foam material; distributed loop antenna means disposed on said second layer; and a third layer surrounding said distributed loop antenna means and said second layer, said third layer being formed of a resiliently flexible, waterproof, and electrically insulating material.
Claim 2
Dependent Claim
99 words
A flexible antenna cable structure adapted to be streamed aft from a submarine for use in E.L.F. radio reception, said antenna cable structure comprising: a flexible, metallic, central strength member; a first layer overlying said strength member and formed of a flexible, electrically insulating, waterproof material; a second layer overlying said first layer and formed of a resilient, electrically insulating foam material; distributed loop antenna means disposed on said second layer; and a third layer surrounding said distributed loop antenna means and said second layer, said third layer being formed of a resiliently flexible, waterproof, and electrically insulating material.
Claim 3
Dependent Claim
48 words
A flexible antenna cable structure as defined in claim 1, and wherein: said distributed loop antenna means comprises a helical wire winding between said second and third layers, said winding having the turns thereof separated, and said second and third layers being in contiguous relation between said turns.
Claim 4
Dependent Claim
33 words
A flexible antenna cable structure as defined in claim 1, and further comprising: a magnetic core in the form of a ribbon of magnetic material helically wound between said first and second layers.
Claim 5
Dependent Claim
33 words
A flexible antenna cable structure as defined in claim 2, and further comprising: a magnetic core in the form of a ribbon of magnetic material helically wound between said first and second layers.
Claim 6
Dependent Claim
32 words
A flexible antenna cable structure as defined in claim 4, and wherein: said distributed loop antenna means is helically wound with a lay of opposite hand to that of said magnetic core.
Claim 7
Dependent Claim
32 words
A flexible antenna structure as defined in claim 2, and wherein: said metallic strength member is formed of magnetic material and serves as a magnetic core for said distributed loop antenna means.
Claim 8
Dependent Claim
58 words
A flexible antenna structure as defined in claim 1, and wherein: said distributed loop antenna means comprises a plurality of spaced, parallel, conductive rings, each of said rings lying in a plane normal to the central axis of said cable, and a flexible conductor means extending parallel to said axis and conductively connected to each of said rings.
References Cited (Backward Citations)
US3229295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-03-14 | 1986-09-13 | 1987-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-14 | 1990-09-13 | 1991-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-14 | 1994-09-13 | 1995-03-15 | $7700.00 | Window Closed / Lapsed |