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US3845488A
Expired / Lapsed
US
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Rearmounted forward-looking radio frequency antenna for projectiles
Assignee: United States Department of the Army
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Filing: 1973-07-20
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Granted: 1974-10-29
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Expires: 1993-07-20
Abstract
Abstract A new radio frequency antenna which is mounted on the rear of the nose cone of a projectile which generates a forward-looking radiation pattern is provided. The antenna comprises the hollow metal nose cone of the projectile with a flat metal base attached. This is electromagnetically excited by an RF source connected to a hollow metal L-shaped cylindrical tube having a wire coaxially extended therethrough. One end of the wire is connected to the radio frequency source along with the hollow tube. The other end of the wire is connected to another similarly shaped solid metal L-shaped cylindrical rod wherein both said Lshaped rod and said L-shaped tube form a U-shaped structure wherein the end faces of said structure are attached to the nose cone. The wire extending through said hollow tube is surrounded by dielectric material and is isolated from said tube throughout. The wire extending through the tube extends beyond the tube and attaches to the rod in such a fashion as to form a gap between the end face of said tube and the end face of said rod. The radio frequency source is attached to the coaxial wire-tube assembly by means of a standard RF connector.
Inventors
- 👤 H Jones
- 👤 A Sindoris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:55
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/28; H01Q1/281
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
A forward-looking radio frequency antenna for projectiles comprising: a. a hollow metal nose cone having a metal base; b. a solid metal L-shaped cylindrical rod having a first end face and a second end face, said first end face attached to said base at a first point; c. a hollow metal L-shaped cylindrical tube having a first open end face and a second open end face, said first open end face attached to said base at a second point; d. a metal wire attached at one end to said solid rod and extending through said hollow tube; e. a source of radio frequency power connected across said hollow tube at said base and the other end of said wire at said base; f. a dielectric material filling the space inside said hollow tube and around said wire therein; and g. the end face of said tube and the end face of said rod being disposed opposite one another across a gap, the arms of said rod and said tube being located on the same axis of symmetry.
Claim 2
Dependent Claim
177 words
A forward-looking radio frequency antenna for projectiles comprising: a. a hollow metal nose cone having a metal base; b. a solid metal L-shaped cylindrical rod having a first end face and a second end face, said first end face attached to said base at a first point; c. a hollow metal L-shaped cylindrical tube having a first open end face and a second open end face, said first open end face attached to said base at a second point; d. a metal wire attached at one end to said solid rod and extending through said hollow tube; e. a source of radio frequency power connected across said hollow tube at said base and the other end of said wire at said base; f. a dielectric material filling the space inside said hollow tube and around said wire therein; and g. the end face of said tube and the end face of said rod being disposed opposite one another across a gap, the arms of said rod and said tube being located on the same axis of symmetry.
Claim 3
Dependent Claim
30 words
The forward-looking radio frequency antenna of claim 1 wherein said second end face of said rod has a coaxial hole therein for receiving said first termination of said wire rod.
Claim 4
Dependent Claim
45 words
The forward-looking radio frequency antenna of claim 2 wherein said first point of attachment and said second point of attachment are located such that said L-shaped rod and said L-shaped tube are diametrically and bilaterally disposed about the central axis of symmetry of said cone.
Claim 5
Dependent Claim
17 words
The forward-looking radio frequency antenna of claim 3 wherein said gap is a radio frequency voltage gap.
Claim 6
Dependent Claim
42 words
The forward-looking radio frequency antenna of claim 1 wherein the length from the first end face of the L-shaped rod to the first end face of the L-shaped tube is equal to one wavelength of the radiated electromagnetic energy from said antenna.
Claim 7
Dependent Claim
33 words
The forward-looking radio frequency antenna of claim 5 further comprising annular mounting blocks attached to said base and through one of which extends said rod and through another of which extends said tube.
Claim 8
Dependent Claim
23 words
The forward-looking radio frequency antenna of claim 6 further comprising means for rigidly holding said tube and said rod in said mounting blocks.
Claim 9
Dependent Claim
15 words
The forward-looking radio frequency antenna of claim 7 wherein said wire extends across said gap.
Claim 10
Dependent Claim
16 words
The forward-looking radio frequency antenna of claim 8 wherein the base of said cone is recessed.
Claim 11
Dependent Claim
24 words
The forward-looking radio frequency antenna of claim 9 wherein said cone comprises a trailing edge which extends beyond said base and is substantially cylindrical.
References Cited (Backward Citations)
US2934761A
Cited
US3680130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |