Patent US3909757A successfully refreshed from Google Patents.
US3909757A
Expired / Lapsed
US
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Leaky coaxial cable
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1974-03-06
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Granted: 1975-09-30
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Expires: 1994-03-06
Abstract
Abstract A leaky coaxial cable wherein the inner conductor is helically wound with its winding direction reversed alternately at a predetermined interval which is approximately equal to 1/2 of the wave length of the operating frequency and the outer conductor is a conductor tube having a gap or straight array of slots provided along the cable axis. The leaky coaxial cable of the present invention, which is installed horizontally, leaks out a vertically polarized leaky wave which is very suitable for use in radio communication systems.
Inventors
- 👤 Yoshio Miyamoto
- 👤 Toshiyuki Ikemiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:10
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/203
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A leaky coaxial cable comprising an inner conductor of at least one helically wound conductor with its winding direction reversed alternately at a predetermined interval approximately equal to one-half of the wave length of the operating frequency, and a coaxial outer conductor having gap means extending along in parallel with the cable axis to leak wave energy propagating in the cable.
Claim 2
Dependent Claim
61 words
A leaky coaxial cable comprising an inner conductor of at least one helically wound conductor with its winding direction reversed alternately at a predetermined interval approximately equal to one-half of the wave length of the operating frequency, and a coaxial outer conductor having gap means extending along in parallel with the cable axis to leak wave energy propagating in the cable.
Claim 3
Dependent Claim
16 words
The leaky coaxial cable of claim 1 wherein said gap means consists of a continuous slot.
Claim 4
Dependent Claim
55 words
The leaky coaxial cable of claim 1 wherein said gap means consists of an end-to-end series of spaced slots of the same length which is slightly smaller than the length of the winding reversion of said inner conductor, the space between said slots being positioned at the reversal points of winding of said inner conductor.
Claim 5
Dependent Claim
26 words
The leaky coaxial cable of claim 1 wherein said inner conductor is wound on a mandrel of magnetic material or insulating material having magnetic material therein.
References Cited (Backward Citations)
US3781725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |