WO1990012407A1 - Coaxial electrical cable construction - Google Patents
Coaxial electrical cable construction Download PDFInfo
- Publication number
- WO1990012407A1 WO1990012407A1 PCT/US1990/001822 US9001822W WO9012407A1 WO 1990012407 A1 WO1990012407 A1 WO 1990012407A1 US 9001822 W US9001822 W US 9001822W WO 9012407 A1 WO9012407 A1 WO 9012407A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cable
- metal
- shield
- wrapped
- conductive
- Prior art date
Links
Classifications
-
- 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
- H01B11/1834—Construction of the insulation between the conductors
- H01B11/1839—Construction of the insulation between the conductors of cellular structure
-
- 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
Definitions
- the present invention relates to coaxial electrical cables for transmission of data signals.
- the cables comprise a metallic center conductor surrounded by insulation, a served or braided
- Cables of this type generally comprise a metallic center conductor surrounded by insulation, a served or braided metal wire shield surrounding the insulation, a o conductive metal foil or metal-laminated polymer or metal-filled polymer tape-wound shield surrounding the served or braided wire shield, and a polymeric protective outer jacket.
- the served or braided metal wire shielding is generally applied to the insulation surrounding the center conductor at 5 between ninety and one hundred percent coverage of the surface area of the insulation in order to provide a cable having adequate electrical properties.
- This invention provides a coaxial electric cable having the 0 advantages over presently known coaxial cables of being smaller and lighter, yet providing the same physical and/or electrical characteristics as larger heavier systems.
- the same good electrical properties that 5 known cables having high coverage (90% or higher coverage) braided or served wire shield can be obtained by cables having a combination of conductive foil in contact with a lower coverage density of the braided or served wires or lower surface area coverage by the wires than in presently known cables.
- Much of this layer thus consists of air gaps between braided or served wires.
- the cable of the invention is also significantly lighter in weight as a consequence of use of less metal in the shielding, a possibly large and important advantage when the inventive cables are used in spacecraft, satellites, and aircraft where extra weight costs heavily.
- Figure 1 is a cross-section of a cable of the invention embodying braided metal wires in the shielding layer.
- Figure 2 shows a perspective of a cable.
- Figure 3 describes a perspective view of the cable including served metal wire shielding.
- Figure 1 shows a cross-section of a form of the cable with the various layers exposed to view.
- the metal center conductor 1 is surrounded by a porous insulative material 2, which is preferably the porous expanded polytetrafluoroethylene as described in U.S. patents 3,953,566, 4,096,227, 3,962,153, and 4,187,390, which fully describe the preferred insulative materials and processes for making them.
- insulative materials could be used for insulation __, including other porous polymer insulations, but these would not be expected to have as good electrical properties as the preferred insulative materials.
- the insulated center conductor 1 is next enclosed by a braided _ or served £ metal wire shield, either of which is usually made from silver- or tin-plated copper wires.
- a braided wire shield 3 is applied to the insulated center conductor by standard wire braiding machinery, but leaving air gaps between wires, as shown in Figure 2.
- Prior art wrapping methods usually resulted in about 901 coverage of the surface of the insulation by the wire. It has been found that only about 10% to about 55% coverage of the insulation surface is needed when the cable includes a conductive metal foil or metal-laminated polymer or metal-filled tape wrapped layer wound around the braided wire shield I or the served wire shield fi.
- the metal-laminated polymer tape 4 including metal layer 7 and polymer layer £, may be aluminized or copper-laminated polyester or porous expanded polytetrafluoroethylene or polyester tape.
- a conductive metal foil may be used instead of metal layer 7 and polymer layer £ laminated tape, and may be, but not limited to, aluminum, copper, or copper alloy foil.
- a jacket 5 Surrounding the shielding layers and providing some physical protection to the cable is a jacket 5, usually extruded or tape wrapped, of a thermoplastic polymer, such as polyvinyl chloride, polyethylene, fluoro polymers, urethane rubber, or rubber, for example.
- a thermoplastic polymer such as polyvinyl chloride, polyethylene, fluoro polymers, urethane rubber, or rubber, for example.
- Figure 3 depicts a cable having a served wire shield fl surrounding insulation 2 and center conductor 1, which in turn is surrounded by a metal-filled polymer layer 2 and a jacket 5.
- Table 1 below compares equal lengths of cables as to weight per unit length and electrical properties for the length. All samples are the same except for the shielding layer. It is observed that all the cables tested for attenuation, capacitance, and inductance by standard methods commonly used in the cable industry had equivalent electrical properties, but the inventive cable weighed 37% less than standard cables, an advantage in aerospace applications or others where weight for equivalent properties may be important.
- the attenuation measurements were by the HP8753A Network Analyzer, capacitance by HP4262A LCR Meter and inductance by HP4262A LCR Meter, and weight by National Contois, Inc. scale model 3800.
Abstract
A coaxial electric cable having a significant reduction in weight for equivalent electrical properties provided by wide spacing of braided or served shielding wires under metal foil, metal-laminated, or conductive tape shielding in a porous expanded polytetrafluoroethylene-insulated cable.
Description
COAXIAL EI_ECTRICAL CABLE CONSTRUCTION BACKGROUND OF THE INVENTION
The present invention relates to coaxial electrical cables for transmission of data signals. The cables comprise a metallic center conductor surrounded by insulation, a served or braided
5 metal wire shield, a metal foil or metal-laminated polymer film or metal-filled polymer shield, and a protective polymeric jacket.
Currently, digital data processing and computing systems and other electronic apparatus have become increasingly smaller and lighter in weight, are manufactured to increasingly close 0 tolerances, and have improved physical and electrical characteristics. Reducing the size and/or weight of a system providing the same electrical and mechanical characteristics as a larger and/or heavier system, or improving the mechanical and electrical characteristics while maintaining the same size and/or 5 weight, can confer a considerable advantage in applications where minimum weight and size are important or which may allow the application to be successful. Cables of this type generally comprise a metallic center conductor surrounded by insulation, a served or braided metal wire shield surrounding the insulation, a o conductive metal foil or metal-laminated polymer or metal-filled polymer tape-wound shield surrounding the served or braided wire shield, and a polymeric protective outer jacket. In a cable of this type, the served or braided metal wire shielding is generally applied to the insulation surrounding the center conductor at 5 between ninety and one hundred percent coverage of the surface area of the insulation in order to provide a cable having adequate electrical properties.
DESCRIPTION OF THE INVENTION
This invention provides a coaxial electric cable having the 0 advantages over presently known coaxial cables of being smaller and lighter, yet providing the same physical and/or electrical characteristics as larger heavier systems. In contrast to the high surface area coverage generally utilized heretofore, it has been discovered that the same good electrical properties that 5 known cables having high coverage (90% or higher coverage) braided or served wire shield can be obtained by cables having a combination of conductive foil in contact with a lower coverage density of the braided or served wires or lower surface area
coverage by the wires than in presently known cables. Much of this layer thus consists of air gaps between braided or served wires. The cable of the invention is also significantly lighter in weight as a consequence of use of less metal in the shielding, a possibly large and important advantage when the inventive cables are used in spacecraft, satellites, and aircraft where extra weight costs heavily.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a cross-section of a cable of the invention embodying braided metal wires in the shielding layer. Figure 2 shows a perspective of a cable. Figure 3 describes a perspective view of the cable including served metal wire shielding.
DESCRIPTION OF PREFERRED EMBODIMENTS
Referring now to the figures for a fuller description of the cable of the invention, Figure 1 shows a cross-section of a form of the cable with the various layers exposed to view. The metal center conductor 1 is surrounded by a porous insulative material 2, which is preferably the porous expanded polytetrafluoroethylene as described in U.S. patents 3,953,566, 4,096,227, 3,962,153, and 4,187,390, which fully describe the preferred insulative materials and processes for making them. Other insulative materials could be used for insulation __, including other porous polymer insulations, but these would not be expected to have as good electrical properties as the preferred insulative materials.
The insulated center conductor 1 is next enclosed by a braided _ or served £ metal wire shield, either of which is usually made from silver- or tin-plated copper wires. A braided wire shield 3 is applied to the insulated center conductor by standard wire braiding machinery, but leaving air gaps between wires, as shown in Figure 2. Prior art wrapping methods usually resulted in about 901 coverage of the surface of the insulation by the wire. It has been found that only about 10% to about 55% coverage of the insulation surface is needed when the cable includes a conductive metal foil or metal-laminated polymer or metal-filled tape wrapped layer wound around the braided wire shield I or the served wire
shield fi. The metal-laminated polymer tape 4, including metal layer 7 and polymer layer £, may be aluminized or copper-laminated polyester or porous expanded polytetrafluoroethylene or polyester tape. A conductive metal foil may be used instead of metal layer 7 and polymer layer £ laminated tape, and may be, but not limited to, aluminum, copper, or copper alloy foil.
Surrounding the shielding layers and providing some physical protection to the cable is a jacket 5, usually extruded or tape wrapped, of a thermoplastic polymer, such as polyvinyl chloride, polyethylene, fluoro polymers, urethane rubber, or rubber, for example.
Figure 3 depicts a cable having a served wire shield fl surrounding insulation 2 and center conductor 1, which in turn is surrounded by a metal-filled polymer layer 2 and a jacket 5.
Table 1 below compares equal lengths of cables as to weight per unit length and electrical properties for the length. All samples are the same except for the shielding layer. It is observed that all the cables tested for attenuation, capacitance, and inductance by standard methods commonly used in the cable industry had equivalent electrical properties, but the inventive cable weighed 37% less than standard cables, an advantage in aerospace applications or others where weight for equivalent properties may be important.
TABLE 1
The attenuation measurements were by the HP8753A Network Analyzer, capacitance by HP4262A LCR Meter and inductance by HP4262A LCR Meter, and weight by National Contois, Inc. scale model 3800.
It will be apparent to those skilled in the art that various modifications and changes in methods and materials can be made for manufacturing and using this invention without departing from the scope thereof, the boundaries of which are delineated by the appended claims.
Claims
1 . A coaxi al el ectri cal cabl e compri si ng:
(a) a conductive metal center conductor surrounded by a layer of 5 (b) electrical insulation;
(c) a conductive wire shield having widely spaced wires;
(d) a wrapped conductive metal shield and;
(e) a protective polymeric jacket.
2. A cable of Claim 1 wherein said electrical insulation is 0 porous polymeric insulation.
3. A cable of Claim 2 wherein said porous insulation is porous expanded polytetrafluoroethylene.
4. A cable of Claim 3 wherein said metal shield comprises served metal wires.
5 5. A cable of Claim 3 wherein said shield metal shield comprises braided metal wires.
6. A cable of Claims 4 or 5 wherein said wrapped metal shield comprises a conductive metal foil.
7. A cable of Claim 4 or 5 wherein said wrapped metal shield o comprises conductive metal-laminated polymer tape.
8. A cable of Claim 4 or 5 wherein said wrapped conductive shield comprises silver metal-filled polytetrafluoroethylene.
9. A cable of Claim 4 or 5 wherein said wrapped conductive shield comprises carbon-filled polytetrafluoroethylene.
10. A cable of Claim 1 wherein the said jacket comprises a thermoplastic polymer.
11. A cable of Claim 1 wherein the said jacket comprises a polyester polymer wrapped jacket.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP90905913A EP0466771B1 (en) | 1989-04-06 | 1990-04-04 | Coaxial electrical cable construction |
DE69012809T DE69012809T2 (en) | 1989-04-06 | 1990-04-04 | CONSTRUCTION OF ELECTRICAL COAXIAL CABLES. |
DE1990905913 DE466771T1 (en) | 1989-04-06 | 1990-04-04 | CONSTRUCTION OF ELECTRICAL COAXIAL CABLES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US334,636 | 1989-04-06 | ||
US07/334,636 US4965412A (en) | 1989-04-06 | 1989-04-06 | Coaxial electrical cable construction |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990012407A1 true WO1990012407A1 (en) | 1990-10-18 |
Family
ID=23308097
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/001822 WO1990012407A1 (en) | 1989-04-06 | 1990-04-04 | Coaxial electrical cable construction |
Country Status (5)
Country | Link |
---|---|
US (1) | US4965412A (en) |
EP (1) | EP0466771B1 (en) |
JP (1) | JPH04507165A (en) |
DE (1) | DE69012809T2 (en) |
WO (1) | WO1990012407A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993016478A1 (en) * | 1992-02-06 | 1993-08-19 | Telefonaktiebolaget Lm Ericsson | An electric cable |
Families Citing this family (36)
Publication number | Priority date | Publication date | Assignee | Title |
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US5171938A (en) * | 1990-04-20 | 1992-12-15 | Yazaki Corporation | Electromagnetic wave fault prevention cable |
US5103067A (en) * | 1991-02-19 | 1992-04-07 | Champlain Cable Corporation | Shielded wire and cable |
US5132490A (en) * | 1991-05-03 | 1992-07-21 | Champlain Cable Corporation | Conductive polymer shielded wire and cable |
US5216204A (en) * | 1991-08-02 | 1993-06-01 | International Business Machines Corp. | Static dissipative electrical cable |
US5254188A (en) * | 1992-02-28 | 1993-10-19 | Comm/Scope | Coaxial cable having a flat wire reinforcing covering and method for making same |
WO1994002948A1 (en) * | 1992-07-27 | 1994-02-03 | Motorola, Inc. | Coiled coaxial cord |
US5945632A (en) * | 1997-08-15 | 1999-08-31 | Dimarzio Inc. | Ribbon overbraid cable |
US6010788A (en) * | 1997-12-16 | 2000-01-04 | Tensolite Company | High speed data transmission cable and method of forming same |
US6403887B1 (en) | 1997-12-16 | 2002-06-11 | Tensolite Company | High speed data transmission cable and method of forming same |
US6246006B1 (en) | 1998-05-01 | 2001-06-12 | Commscope Properties, Llc | Shielded cable and method of making same |
DE19930719A1 (en) * | 1999-07-02 | 2001-01-04 | Ephy Mess Ges Fuer Elektro Phy | Process for increasing the high voltage strength of sensors and sensor with increased high voltage strength |
US6326548B1 (en) | 1999-07-09 | 2001-12-04 | Nissei Electric Co., Ltd. | End-processed coaxial cable structures and methods for producing the same |
US6825418B1 (en) | 2000-05-16 | 2004-11-30 | Wpfy, Inc. | Indicia-coded electrical cable |
US6384337B1 (en) | 2000-06-23 | 2002-05-07 | Commscope Properties, Llc | Shielded coaxial cable and method of making same |
US6452107B1 (en) | 2000-11-10 | 2002-09-17 | Tensolite Company | Multiple pair, high speed data transmission cable and method of forming same |
WO2007011350A1 (en) * | 2005-07-15 | 2007-01-25 | Prysmian Cavi E Sistemi Energia S.R.L. | Cable having expanded, strippable jacket |
KR100816587B1 (en) * | 2006-08-17 | 2008-03-24 | 엘에스전선 주식회사 | Foam coaxial cable and method for manufacturing the same |
US8905108B2 (en) | 2007-06-04 | 2014-12-09 | Encore Wire Corporation | Method and apparatus for applying labels to cable |
US8826960B1 (en) | 2009-06-15 | 2014-09-09 | Encore Wire Corporation | System and apparatus for applying labels to cable or conduit |
US7954530B1 (en) | 2009-01-30 | 2011-06-07 | Encore Wire Corporation | Method and apparatus for applying labels to cable or conduit |
US11319104B1 (en) | 2009-01-30 | 2022-05-03 | Encore Wire Corporation | System and apparatus for applying labels to cable or conduit |
US9728304B2 (en) | 2009-07-16 | 2017-08-08 | Pct International, Inc. | Shielding tape with multiple foil layers |
US8853539B2 (en) * | 2009-09-11 | 2014-10-07 | Heng Chen | Cable with current leakage detection function |
US8882520B2 (en) | 2010-05-21 | 2014-11-11 | Pct International, Inc. | Connector with a locking mechanism and a movable collet |
US8579658B2 (en) | 2010-08-20 | 2013-11-12 | Timothy L. Youtsey | Coaxial cable connectors with washers for preventing separation of mated connectors |
FR2977737B1 (en) * | 2011-07-06 | 2013-08-02 | Francois Cabaud | SURGICAL LIGHTING ASSEMBLY |
US9028276B2 (en) | 2011-12-06 | 2015-05-12 | Pct International, Inc. | Coaxial cable continuity device |
US20140209347A1 (en) * | 2013-01-29 | 2014-07-31 | Tyco Electronics Corporation | Cable Having a Sparse Shield |
US9991023B2 (en) | 2013-01-29 | 2018-06-05 | Creganna Unlimited Company | Interconnect cable having insulated wires with a conductive coating |
CN104616766A (en) * | 2015-01-30 | 2015-05-13 | 无为县金华电缆材料有限公司 | Multi-strand conductor armored shielding cable |
CN104637592A (en) * | 2015-01-30 | 2015-05-20 | 无为县金华电缆材料有限公司 | Multi-strand conductor cable |
CN104751955A (en) * | 2015-02-27 | 2015-07-01 | 安徽恒晶电缆集团有限公司 | Explosion-proof safety circuit control cable |
CN104795142A (en) * | 2015-02-27 | 2015-07-22 | 安徽恒晶电缆集团有限公司 | Low-smoke zero-halogen double-layer shielding drainage cable |
FR3044160B1 (en) | 2015-11-24 | 2018-10-26 | Airbus Helicopters | COAXIAL ELECTRICAL CABLE, DETECTION DEVICE EQUIPPED WITH SUCH A CABLE FOR DETECTING A FLUID LEAK HAVING A PIPE AND DETECTION METHOD THEREOF |
JP7140074B2 (en) * | 2019-08-27 | 2022-09-21 | 日立金属株式会社 | coaxial cable |
US11848120B2 (en) | 2020-06-05 | 2023-12-19 | Pct International, Inc. | Quad-shield cable |
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GB942142A (en) * | 1960-07-11 | 1963-11-20 | North Western Specialities Ltd | Improvements relating to co-axial cables |
FR2377690A1 (en) * | 1977-01-12 | 1978-08-11 | Kupferdraht Isolierwerk Ag | COAXIAL CABLE |
DE3308300A1 (en) * | 1982-08-20 | 1984-02-23 | Kombinat VEB Kabelwerk Oberspree (KWO) "Wilhelm Pieck", DDR 1160 Berlin | Highly-flexible miniature coaxial line |
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JPS58154514U (en) * | 1982-04-12 | 1983-10-15 | 古河電気工業株式会社 | Rubber, plastic insulated power cable |
US4477693A (en) * | 1982-12-09 | 1984-10-16 | Cooper Industries, Inc. | Multiply shielded coaxial cable with very low transfer impedance |
US4501928A (en) * | 1983-05-09 | 1985-02-26 | Dainichi-Nippon Cables, Ltd. | Shielding tape and electric cables using same |
DE3428087A1 (en) * | 1984-07-30 | 1986-01-30 | Kraftwerk Union AG, 4330 Mülheim | CONCENTRIC THREE-WIRE CABLE |
JPS61281406A (en) * | 1985-06-06 | 1986-12-11 | 株式会社 潤工社 | Transmission line |
US4725693A (en) * | 1986-09-08 | 1988-02-16 | Arvey Corporation | Power cable and laminate providing moisture barrier for power cable |
-
1989
- 1989-04-06 US US07/334,636 patent/US4965412A/en not_active Expired - Fee Related
-
1990
- 1990-04-04 DE DE69012809T patent/DE69012809T2/en not_active Expired - Fee Related
- 1990-04-04 JP JP2505884A patent/JPH04507165A/en active Pending
- 1990-04-04 EP EP90905913A patent/EP0466771B1/en not_active Expired - Lifetime
- 1990-04-04 WO PCT/US1990/001822 patent/WO1990012407A1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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GB942142A (en) * | 1960-07-11 | 1963-11-20 | North Western Specialities Ltd | Improvements relating to co-axial cables |
FR2377690A1 (en) * | 1977-01-12 | 1978-08-11 | Kupferdraht Isolierwerk Ag | COAXIAL CABLE |
DE3308300A1 (en) * | 1982-08-20 | 1984-02-23 | Kombinat VEB Kabelwerk Oberspree (KWO) "Wilhelm Pieck", DDR 1160 Berlin | Highly-flexible miniature coaxial line |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1993016478A1 (en) * | 1992-02-06 | 1993-08-19 | Telefonaktiebolaget Lm Ericsson | An electric cable |
EP0558463A1 (en) * | 1992-02-06 | 1993-09-01 | Telefonaktiebolaget Lm Ericsson | An electric cable |
US5391836A (en) * | 1992-02-06 | 1995-02-21 | Telefonaktiebolaget L M Ericsson | Electric cable |
AU660538B2 (en) * | 1992-02-06 | 1995-06-29 | Telefonaktiebolaget Lm Ericsson (Publ) | An electric cable |
Also Published As
Publication number | Publication date |
---|---|
EP0466771A1 (en) | 1992-01-22 |
DE69012809D1 (en) | 1994-10-27 |
DE69012809T2 (en) | 1995-02-16 |
EP0466771B1 (en) | 1994-09-21 |
JPH04507165A (en) | 1992-12-10 |
US4965412A (en) | 1990-10-23 |
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