US3569979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical launcher
Assignee: Ohio State University Research Foundation
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Filing: 1968-12-05
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Granted: 1971-03-09
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Expires: 1988-12-05
Abstract
Abstract The invention is for a helical antenna assembly which utilizes a coaxial cable as a means of electrical excitation and provides a gradual transition from the coaxial cable to the helix wire to permit higher power excitation and elimination of a flat ground plane.
Inventors
- 👤 Benedikt Aa Munk
- 👤 Leon Peters Jr
- 👤 Edward K Damon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:09
CPC Classifications
H; H01; H01Q; H01Q11/00; H01Q11/02; H01Q11/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
92 words
A helical antenna including a coaxial cable as the means of electrical excitation of said antenna''s helix, the improvement comprising said helix fixedly attached to the inner conductor of said coaxial cable, said coaxial cable having removed a predetermined length of the metal in said coaxial cable''s outer conductor at the end of said cable coincident with said attachment of said helix, and said inner conductor having said predetermined length of said outer conductor of said coaxial cable removed therefrom formed into a helical shape conforming to that of said antenna''s helix.
Claim 2
Dependent Claim
92 words
A helical antenna including a coaxial cable as the means of electrical excitation of said antenna''s helix, the improvement comprising said helix fixedly attached to the inner conductor of said coaxial cable, said coaxial cable having removed a predetermined length of the metal in said coaxial cable''s outer conductor at the end of said cable coincident with said attachment of said helix, and said inner conductor having said predetermined length of said outer conductor of said coaxial cable removed therefrom formed into a helical shape conforming to that of said antenna''s helix.
Claim 3
Dependent Claim
22 words
A helical antenna as set forth in claim 1 wherein said metal is removed in a tapered configuration from said outer conductor.
Claim 4
Dependent Claim
19 words
A helical antenna as set forth in claim 1 wherein said metal is linearly removed from said outer conductor.
Claim 5
Dependent Claim
19 words
A helical antenna as set forth in claim 1 wherein said metal is exponentially removed from said outer conductor.
Claim 6
Dependent Claim
44 words
A helical antenna as set forth in claim 1 wherein said outer conductor of said coaxial cable is tapered over a length of approximately one-half the wavelength of the operating frequency in that portion of said conductor which is internal to said antenna''s helix.
Claim 7
Dependent Claim
45 words
A helical antenna as set forth in claim 1 wherein said outer conductor of said coaxial cable is tapered over a length of approximately 1 1/2 the wavelength of the operating frequency in that portion of said conductor which is external to said antenna''s helix.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |