US3810186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leaky coaxial cable
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1971-02-17
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Granted: 1974-05-07
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Expires: 1991-02-17
Abstract
Abstract This invention provides a leaky coaxial cable suitable for vehicle communication. The leaky coaxial cable of this invention has on the surface of its outer conductor a number of slots which are positioned zigzag at a cycle approaching lambda g/2 ( lambda g: guide wave-length of the coaxial cable) and leaks a part of the electromagnetic energy propagating in the coaxial cable in the form a vertical polarized wave through the slots. This invention further provides a method of manufacturing such a leaky coaxial cable and a vehicle communication system using such a leaky coaxial cable.
Inventors
- 👤 T Nakahara
- 👤 N Kurauchi
- 👤 T Nagao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/203
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A leaky coaxial cable having a central conductor and an outer coaxial sheath type conductor insulated from said inner conductor, at least one longitudinally adjacent pair of identical but symmetrically opposed non-resonant slots in said otherwise imperforate outer conductor having portions thereof extending in the axial and circumferential directions, said opposed slots having a center-to-center spacing P/2 wherein P is given by the formula lambda o lambda g/( lambda o+ lambda g) <P< 2 lambda o lambda g/( lambda o + lambda g), wherein lambda o is the wave length in free space and lambda g is the wave guide wave length in the coaxial cable, to provide a gradient polarized wave when energized having the axial components thereof effectively cancelled.
Claim 2
Dependent Claim
121 words
A leaky coaxial cable having a central conductor and an outer coaxial sheath type conductor insulated from said inner conductor, at least one longitudinally adjacent pair of identical but symmetrically opposed non-resonant slots in said otherwise imperforate outer conductor having portions thereof extending in the axial and circumferential directions, said opposed slots having a center-to-center spacing P/2 wherein P is given by the formula lambda o lambda g/( lambda o+ lambda g) <P< 2 lambda o lambda g/( lambda o + lambda g), wherein lambda o is the wave length in free space and lambda g is the wave guide wave length in the coaxial cable, to provide a gradient polarized wave when energized having the axial components thereof effectively cancelled.
Claim 3
Dependent Claim
29 words
The leaky coaxial cable of claim 1 characterized by a plurality of said slot pairs in said outer conductor forming a longitudinal series of identical but alternately opposed slots.
Claim 4
Dependent Claim
21 words
The leaky coaxial cable of claim 2 wherein said slots are inclined with respect to the axis of the transmission line.
Claim 5
Dependent Claim
23 words
The leaky coaxial cable of claim 2 wherein said slots have segments which are not inclined to the axis of the transmission line.
Claim 6
Dependent Claim
14 words
The leaky coaxial cable of claim 2 wherein said slots have a Z-shaped configuration.
Claim 7
Dependent Claim
70 words
A leaky coaxial cable having a central conductor and an outer coaxial sheath type conductor insulated from said inner conductor, a longitudinal series of slots in said outer conductor, adjacent of said slots being identical but symmetrically opposed and having a center-to-center spacing approaching lambda g/2 said slots having curved portions to provide a gradient polarized wave when said coaxial cable is energized having the axial components thereof effectively cancelled.
Claim 8
Dependent Claim
70 words
A leaky coaxial cable having a central conductor and an outer coaxial sheath type conductor insulated from said inner conductor, a longitudinal series of slots in said outer conductor, adjacent of said slots being identical but symmetrically opposed and having a center-to-center spacing approaching lambda g/2 said slots having curved portions to provide a gradient polarized wave when said coaxial cable is energized having the axial components thereof effectively cancelled.
Claim 9
Dependent Claim
136 words
A leaky coaxial cable having a central conductor and an outer coaxial sheath type conductor insulated from said inner conductor, at least one longitudinally adjacent pair of identical but symmetrically opposed slots in said outer conductor having portions thereof extending in the axial and circumferential directions, said opposed slots having a center-to-center spacing approaching lambda g/2 to provide a gradient polarized wave when energized having the axial components thereof effectively cancelled, said outer sheath type conductor consisting of an elongated conductive strip coextending with said inner conductor and wrapped circumferentially in its transverse direction about insulation means positioned over said inner conductor such that the resulting strip seam runs longitudinally with said central conductor, said seam providing a gap having a uniform zigzag configuration with conductive means covering its points of reversal to provide said slots.
Claim 10
Dependent Claim
136 words
A leaky coaxial cable having a central conductor and an outer coaxial sheath type conductor insulated from said inner conductor, at least one longitudinally adjacent pair of identical but symmetrically opposed slots in said outer conductor having portions thereof extending in the axial and circumferential directions, said opposed slots having a center-to-center spacing approaching lambda g/2 to provide a gradient polarized wave when energized having the axial components thereof effectively cancelled, said outer sheath type conductor consisting of an elongated conductive strip coextending with said inner conductor and wrapped circumferentially in its transverse direction about insulation means positioned over said inner conductor such that the resulting strip seam runs longitudinally with said central conductor, said seam providing a gap having a uniform zigzag configuration with conductive means covering its points of reversal to provide said slots.
Claim 11
Dependent Claim
31 words
The leaky coaxial cable of claim 7 characterized in that said conductive means consists of lateral protrusions of said conductive strip positioned at said points of reversal to bridge said gap.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |