US3795915A
Expired / Lapsed
US
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Leaky coaxial cable
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1972-10-20
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Granted: 1974-03-05
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Expires: 1992-10-20
Abstract
Abstract A leaky coaxial cable is disclosed, which is a very preferable transmission line for use in vehicular communication system. It has an outer conductor having a slot array in the direction of the cable axis such that each slot is arranged periodically at a fixed interval and a fixed shape, but with the dimensions thereof or other radiation factors of the slot being changed sinusoidally in another periodicity different from the periodicity of the slots. The leaky coaxial cable according to the present invention has very broad band characteristics in the radiation properties of the leaky wave.
Inventors
- 👤 K Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:00
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/203; H01Q21/00; H01Q21/06; H01Q21/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
104 words
A leaky coaxial cable comprising an inner conductor, a coaxial tubular outer conductor and a longitudinal leaky slot array in said outer conductor with a fixed slot center-to-center spacing, characterized in that the slots in said array at least in part extend in length other than transverse to the axis of said cable and the radiation intensity factors of said slots are successively varied in a sinusoidal fashion such that a plurality of slots are present in each sinusoidal half cycle with the slot configuration and direction of slot length extension for one half cycle alternately reverse from one half cycle to the next.
Claim 2
Dependent Claim
104 words
A leaky coaxial cable comprising an inner conductor, a coaxial tubular outer conductor and a longitudinal leaky slot array in said outer conductor with a fixed slot center-to-center spacing, characterized in that the slots in said array at least in part extend in length other than transverse to the axis of said cable and the radiation intensity factors of said slots are successively varied in a sinusoidal fashion such that a plurality of slots are present in each sinusoidal half cycle with the slot configuration and direction of slot length extension for one half cycle alternately reverse from one half cycle to the next.
Claim 3
Dependent Claim
39 words
The leaky coaxial cable of claim 1 wherein said slot radiation intensity factors which are varied are selected from one or more factors in the group consisting of slot size and slot angle of inclination to the cable axis.
Claim 4
Dependent Claim
20 words
The leaky coaxial cable of claim 1 wherein slots corresponding to zero radiation amplitude in said sinusoidal array are eliminated.
Claim 5
Dependent Claim
27 words
The leaky coaxial cable of claim 1 wherein each slot has the same angle of inclination to the cable axis and the slot length is successively varied.
Claim 6
Dependent Claim
21 words
The leaky coaxial cable of claim 4 wherein the slots corresponding to zero radiation amplitude in said sinusoidal array are eliminated.
Claim 7
Dependent Claim
26 words
The leaky coaxial cable of claim 1 wherein each slot has the same length and the slot inclination angle to the cable axis is successively varied.
Claim 8
Dependent Claim
21 words
The leaky coaxial cable of claim 6 wherein the slots corresponding to zero radiation amplitude in said sinusoidal array are eliminated.
Claim 9
Dependent Claim
22 words
The leaky coaxial cable of claim 1 wherein the slot length and inclination angle to the cable axis are successively varied simultaneously.
Claim 10
Dependent Claim
21 words
The leaky coaxial cable of claim 8 wherein the slots corresponding to zero radiation amplitude in said sinusoidal array are eliminated.
Claim 11
Dependent Claim
19 words
The leaky coaxial cable of claim 1 wherein each slot in said sinusoidal array has a bent line configuration.
Claim 12
Dependent Claim
21 words
The leaky coaxial cable of claim 10 wherein the slots corresponding to zero radiation amplitude in said sinusoidal array are eliminated.
Claim 13
Dependent Claim
98 words
A leaky coaxial cable comprising an inner conductor, a coaxial tubular outer conductor and a longitudinal leaky slot array in said outer conductor with a fixed slot center spacing Po, characterized in that the radiation intensity factors of the slots in said array are successively varied in a sinusoidal fashion whereby the wave source intensity and phase of the l-th slot satisfy the equation Sl (A.cos 2 pi ze/P + B) exp (-J Beta ze) wherein ze l.Po, P is the slot pitch, Beta is the propagation constant in the waveguide, and A and B are arbitrary constants.
Claim 14
Dependent Claim
98 words
A leaky coaxial cable comprising an inner conductor, a coaxial tubular outer conductor and a longitudinal leaky slot array in said outer conductor with a fixed slot center spacing Po, characterized in that the radiation intensity factors of the slots in said array are successively varied in a sinusoidal fashion whereby the wave source intensity and phase of the l-th slot satisfy the equation Sl (A.cos 2 pi ze/P + B) exp (-J Beta ze) wherein ze l.Po, P is the slot pitch, Beta is the propagation constant in the waveguide, and A and B are arbitrary constants.
Claim 15
Dependent Claim
38 words
The leaky coaxial cable of claim 12 wherein said slot radiation factors which are varied are selected from one or more factors in the group consisting of slot size and slot angle of inclination to the cable axis.
Claim 16
Dependent Claim
21 words
The leaky coaxial cable of claim 12 wherein the slots corresponding to zero radiation amplitude in said sinusoidal array are eliminated.
References Cited (Backward Citations)
US3106713A
Cited
US3560970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |