Patent US4807893A successfully refreshed from Google Patents.
US3775772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultra hard communications antenna
Assignee: United States Department of the Air Force
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Filing: 1966-05-11
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Granted: 1973-11-27
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Expires: 1986-05-11
Abstract
Abstract A ground-to-air antenna capable of withstanding all overpressures outside the crater of a nuclear explosion including a massive reinforced concrete block having one exposed surface flush with the surrounding terrain, copperplating the reinforcing members and placing an insulation-filled wave guide in the concrete and connecting it to a sending and receiving means, while the impedance of the wave guide is matched to that of free space.
Inventors
- 👤 T Carrell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:32
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
An apparatus for sending and receiving radio waves comprising: a mass of reinforced concrete with its exposed surface flush with the earth surrounding it; a plurality of copperplated reinforcing wires embedded in said mass of concrete and disposed in a plane parallel to the earth''s surface; a slot mounted in said mass, said slot being a wave guide filled with an insulating medium, the impedance of said wave guide matched to that of free space while connected both to the antenna and sending and receiving means.
Claim 2
Independent Claim
86 words
An apparatus for sending and receiving radio waves comprising: a mass of reinforced concrete with its exposed surface flush with the earth surrounding it; a plurality of copperplated reinforcing wires embedded in said mass of concrete and disposed in a plane parallel to the earth''s surface; a slot mounted in said mass, said slot being a wave guide filled with an insulating medium, the impedance of said wave guide matched to that of free space while connected both to the antenna and sending and receiving means.
Claim 3
Dependent Claim
11 words
An antenna according to claim 1 wherein the antenna is unidirectional.
Claim 4
Dependent Claim
13 words
An antenna according to claim 1 wherein the slot is a crossed slot.
Claim 5
Dependent Claim
11 words
An antenna according to claim 3 wherein the antenna is omni-directional.
Claim 6
Dependent Claim
18 words
An antenna according to claim 1 wherein containment means are provided within the antenna for radio frequency circuitry.
Claim 7
Dependent Claim
25 words
An apparatus according to claim 1 wherein said insulating medium comprises a mixture of substantially 90 percent quartz fibers with a 10 percent epoxy binder.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |