GB2049262A - Coaxial cable and method of using it - Google Patents
Coaxial cable and method of using it Download PDFInfo
- Publication number
- GB2049262A GB2049262A GB7916683A GB7916683A GB2049262A GB 2049262 A GB2049262 A GB 2049262A GB 7916683 A GB7916683 A GB 7916683A GB 7916683 A GB7916683 A GB 7916683A GB 2049262 A GB2049262 A GB 2049262A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coaxial cable
- power
- screen
- central conductor
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4416—Heterogeneous cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1808—Construction of the conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1891—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor comprising auxiliary conductors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Insulated Conductors (AREA)
Abstract
A coaxial cable comprises a central conductor 1, an insulating sheath 2, a plurality of strands 3 of an electrically conductive material laid side by side along the sheath 2 parallel to the central conductor 1 and an insulating cover 4. In use, power is supplied to a system through the strands 3, while information for the system is supplied down the central conductor 1. The strands act as a screen inhibiting corruption of the information signals flowing along the central conductor and the radiation of interference from the central conductor itself. <IMAGE>
Description
SPECIFICATION
Coaxial cable and method of using it
The present invention relates to a coaxial cable.
The cable is particularly, but not exclusively, intended for use in the multiplex information handling and transmission system forming the subject of co-pending application 9493/78.
According to one aspect of the present invention, there is provided a coaxial cable comprising a central element adapted in use to carry information signals therealong and a coaxial surrounding tubular screen adapted, in use, to carry electrical power therealong, the screen consisting of parallel strands of conductive material laid side by side and displaced from the central element.
According to another aspect of the present invention there is provided a method of supplying power and information to a system in which the power for the system is supplied through the screen of a coaxial cable and the information is supplied down the central conductor of the cable.
In order that the invention may be more clearly understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawings in which,
Figure 1 shows a section of coaxial cable and
Figure 2 shows a coaxial cable in use in a multiplex information handling system.
Referring to Fig. 1, the cable comprises a single central conductor 1 surrounded by a sheath 2 of electrically insulating polyvinyl chloride. Laid on the sheath 2 parallel to the central conductor 1 are a plurality of copper strands 3. The strands 3 contact each other to effectively form a conductor of a tubular section. The cable is completed by a further sheath 4 of polyvinyl chloride.
The cable is particularly suited to the provision of d.c. or low frequency (less than 1 MHz where skin effect is negligible) a.c. power.
The construction provides a higher surface area to conductor volume per unit length than would be achieved if the central axial dielectric or insulator were to have zero cross sectional area. The benefit from this increased ratio may be realised in different ways, e.g.:
1) Equal amounts of copper may provide a
greater power capacity in this construc
tion.
2) Equal power capacity may be realised in
this construction with a smaller quantity
of copper and provides an appropriate
overall decrease in cost and weight even
though this is offset slightly by the cost
and weight of the increased quantity of
outer insulation and the inclusion of the
central dielectric or insulator.
This construction also has considerable power rating advantages over "cottage loaf" constructions where the signal conductor is lashed or fastened to the side of the power conductor.
Fig. 2 shows one use to which the cable of
Fig. 1 may be put. This Fig. 2 is a diagrammatic perspective view of a local processing unit for a multiplex information handling system of the type described in co-pending application No. 9493/78. The unit has a plurality of inputs 51, a plurality of outputs 52, an input socket 53 for a combined signal and power bus 54 and an output socket 55 for the bus 54 which may be a coaxial cable of the type shown in Fig. 1. The inputs 51, including inputs 51A from switches and analogue sensors, lead to and the outputs 52 lead from circuitry contained in a housing 56 having apertures lugs 57 for connecting it to a convenient support.
The system is intended for a vehicle in particular the relatively small mass produced family saloon. It will replace the present con ventional wiring harness which is becoming increasingly complex, difficult to install and expensive. The combined signal and power bus can be taken simply round the vehicle in a similar fashion to a ring main and local processing unit arranged on it at appropriate positions. The combination of signal and power lines in a signal bus has other advantages. The bus comprises concentrically arranged inner and outer conductors 54A and 54B. The outer conductor, which constitutes the power line, contains a substantial amount of copper which ensures good screening for the inner conductor which constitutes the signal line.This screening effect will minimise the tendency to pick-up voltage spikes on the signal bus from electrical equipment in the vehicle. Also, the screening effect will minimise the interference caused to radio reception in the vehicle from pulses present on the signal bus. Further, the co-axial arrangement is convenient for a moulded plug, and socket connection to each l.p.u., where the large area provided by the outer contact will carry the high current.
The input and output sockets 53 and 55 of each l.p.u. are coaxially arranged. Co-axial "Tee" junctions can be provided as shown in
Fig. 2 at 59 to give total flexibility to the wiring of the bus which may form loops or rings with spurs if required. This will enable the current requirement to different loads to be balanced, such that very substantial current capacity of the co-axial outer conductor 54B is avoided. The co-axial cable need not be flexible and the expensive use of braids is not required. The local processing units are spaced along the combined power and signal bus at suitable intervals determined by the load and switch requirements of the vehicle in which the system is installed.
Claims (8)
- A A coaxial cable comprising a central element adapted in use to carry information signals therealong and a coaxial surrounding tubular screen adapted, in use, to carry elec trical power therealong, the screen consisting of parallel strands of conductive material laid side by side and displaced from the central element.
- 2. A coaxial cable as claimed in claim 1, in which the central element and the tubular screen are separated by a tubular insulator or dielectric.
- 3. A coaxial cable as claimed in claim 1 or 2 in which the tubular screen is covered by a tubular insulator.
- 4. A coaxial cable as claimed in claim 1 or 2, in which the or each tubular insulator is of polyvinyl chloride.
- 5. A coaxial cable as claimed in any of claims 1 to 4, in which the central element is a fibre optic.
- 6. A coaxial cable substantially as hereinbefore described with reference to Fig. 1 or Fig. 2 of the accompanying drawings.
- 7. A method of supplying power and information to a system in which the power for the system is supplied through the screen of a coaxial cable and the information is supplied down the central conductor of the cable.
- 8. A method of supplying power and information to a system substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7916683A GB2049262B (en) | 1979-05-14 | 1979-05-14 | Coaxial cable and method of using it |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB7916683A GB2049262B (en) | 1979-05-14 | 1979-05-14 | Coaxial cable and method of using it |
Publications (2)
Publication Number | Publication Date |
---|---|
GB2049262A true GB2049262A (en) | 1980-12-17 |
GB2049262B GB2049262B (en) | 1983-04-27 |
Family
ID=10505141
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7916683A Expired GB2049262B (en) | 1979-05-14 | 1979-05-14 | Coaxial cable and method of using it |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2049262B (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095254A2 (en) * | 1982-05-27 | 1983-11-30 | Nissan Motor Co., Ltd. | Composite cable |
US4538023A (en) * | 1982-04-28 | 1985-08-27 | Brisson Bruce A | Audio signal cable |
US4731506A (en) * | 1986-10-29 | 1988-03-15 | Noel Lee | Signal cable assembly |
US4734544A (en) * | 1986-10-29 | 1988-03-29 | Noel Lee | Signal cable having an internal dielectric core |
US4743712A (en) * | 1987-03-30 | 1988-05-10 | Noel Lee | Signal cable assembly with fibrous insulation and an internal core |
US4777324A (en) * | 1987-03-30 | 1988-10-11 | Noel Lee | Signal cable assembly with fibrous insulation |
USRE33750E (en) * | 1986-10-29 | 1991-11-26 | Signal cable assembly | |
WO1994023434A1 (en) * | 1993-04-01 | 1994-10-13 | Kabelwerke Reinshagen Gmbh | Hf cable |
EP1357406A2 (en) * | 2002-04-22 | 2003-10-29 | Nortel Networks Limited | Improved electromagnetic shielded housing waveguide arrangement |
EP2333791A3 (en) * | 2009-12-10 | 2013-01-23 | Armour Home Electronics Limited | Cable and apparatus connected thereto |
-
1979
- 1979-05-14 GB GB7916683A patent/GB2049262B/en not_active Expired
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4538023A (en) * | 1982-04-28 | 1985-08-27 | Brisson Bruce A | Audio signal cable |
EP0095254A2 (en) * | 1982-05-27 | 1983-11-30 | Nissan Motor Co., Ltd. | Composite cable |
EP0095254A3 (en) * | 1982-05-27 | 1986-02-19 | Nissan Motor Co., Ltd. | Composite cable |
US4731506A (en) * | 1986-10-29 | 1988-03-15 | Noel Lee | Signal cable assembly |
US4734544A (en) * | 1986-10-29 | 1988-03-29 | Noel Lee | Signal cable having an internal dielectric core |
USRE33750E (en) * | 1986-10-29 | 1991-11-26 | Signal cable assembly | |
US4777324A (en) * | 1987-03-30 | 1988-10-11 | Noel Lee | Signal cable assembly with fibrous insulation |
US4743712A (en) * | 1987-03-30 | 1988-05-10 | Noel Lee | Signal cable assembly with fibrous insulation and an internal core |
WO1994023434A1 (en) * | 1993-04-01 | 1994-10-13 | Kabelwerke Reinshagen Gmbh | Hf cable |
US5739471A (en) * | 1993-04-01 | 1998-04-14 | Draka Deutschland Gmbh & Co. Kg | High-frequency cable |
EP1357406A2 (en) * | 2002-04-22 | 2003-10-29 | Nortel Networks Limited | Improved electromagnetic shielded housing waveguide arrangement |
EP1357406A3 (en) * | 2002-04-22 | 2003-12-10 | Nortel Networks Limited | Improved electromagnetic shielded housing waveguide arrangement |
EP2333791A3 (en) * | 2009-12-10 | 2013-01-23 | Armour Home Electronics Limited | Cable and apparatus connected thereto |
Also Published As
Publication number | Publication date |
---|---|
GB2049262B (en) | 1983-04-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920514 |