US3248473A - Low-capacitance type of high-frequency cable - Google Patents

Low-capacitance type of high-frequency cable Download PDF

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Publication number
US3248473A
US3248473A US307055A US30705563A US3248473A US 3248473 A US3248473 A US 3248473A US 307055 A US307055 A US 307055A US 30705563 A US30705563 A US 30705563A US 3248473 A US3248473 A US 3248473A
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US
United States
Prior art keywords
rope
diameter
inner conductor
cable
conductor
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Expired - Lifetime
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US307055A
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English (en)
Inventor
Guenther Buhmann
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International Standard Electric Corp
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International Standard Electric Corp
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Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
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Publication of US3248473A publication Critical patent/US3248473A/en
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    • 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
    • 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
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/12—Arrangements for exhibiting specific transmission characteristics

Definitions

  • This invention relates to coaxial cables and more particularly to insulation'for coaxial cables.
  • Present lowcapacitance high-frequency cables are characterized by fairly large spacings between the inner and outer conductors.
  • Coaxial cables of this type utilize air-space insulating and inner conductors consisting of, very thin wire. Because of the need for mechanical strength, the diameter of the thin inner conductor cannot be reduced. If a very low capacitance is desired between the inner and outer conductor, the diameter of the outer conductor can be increased, but this will cause an increase in both the thickness and the stiffness of the cable. In the cases where it is absolutely necessary to avoid this, the electrical values .can only be maintained by reducing the dielectric constant.
  • the supporting structure for the inner conductor must be provided with a corresponding greater amount of insulating material, and the value of the dielectric con- 'stant will then exceed the ideal value l by a wide margin. This is also true e.g. in the case of low-capacitance highfrequency cables having a characteristic impedance of 150 ohms when considering the coaxial type corresponding to the German Industrial Standard DIN 47268.
  • Cables of this type are required to have a maximum capacitance of 27 picofarads per meter (pf./m.).
  • these cables lare grouped in accordance with various diameters.
  • the internal diameter of the outer conductor is supposed to range from 6.1 to 6.6 mm.
  • the internal diameter of the outer conductor is supposed to range from 9.5 to 10.0 mm.
  • the thickness of the inner conductor is determined by the equation:
  • D internal diameter of outer conductor dzexternal diameter of inner conductor
  • the cable is constructed as follows:
  • Inner conductor Copper, solid, long 0.5 Insulation:
  • Plastic rope or cord with a pitch of 6-12 mm Plastic rope or cord with a pitch of 6-12 mm.
  • Outer conductor Copper mesh 9
  • Protective sheath Polyvinylchloride 1l
  • Inner conductor 1 is surrounded by a plastic rope consisting of foam material 2 and ⁇ a tube 3 of insulating material.
  • Tubing 3 which provides mechanical support, may be eliminated and a solid plastic rope used.
  • the rope helically surrounds the inner conductor.
  • Sheathing 4 of plastic foil surrounds and contains the plastic rope.
  • This plastic foil may consist of cellulose triacetate.
  • the remaining space ⁇ between the inner and outer conductor is filled with insulating foam material 5.
  • therouter conductor 6 which may have the shape of a copper mesh or of a copper tape, and which is provided on its outside of a protective sheathing 7, e.g. of polyvinylchloride (PVC).
  • PVC polyvinylchloride
  • this cable construction comprises a supporting arrange- If it is possible to i
  • the rope may be designed as a solid length of polyethylene having a diameter between 0.8 and 1.2 mm.; the patch of this rope being 6-8 mm. With the aid of this rope construction and in combination with the hose or tube of foam material, a dielectric constant of 1.35 mm. is obtained;
  • the rope may be made of polyethylene foam material. This will further reduce the dielectric constant.
  • a carrier or support is embedded in it. A thin thread of polyamide having a diameter of about 0.1 mm. may be used for this support. It has been found that this thin thread does not have adverse affects on the electrical characteristics of the cable.
  • the present-invention provides a low-capacitance and light-weight air-spaceinsulated high-frequency coaxial cable which is supposed to be particularly .featured by the fact that the space between the inner and the outer conductor consists of two coaxial layers arranged in one another, and differing from one another with respect to their dielectric constants, of which the internal layer is constituted by a rope helically enclosing the inner conductor, and comprising a foil of insulating material covering the rope space, and of which the external layer is constituted by a plastics foam material.
  • the inventive construction of the insulation between the inner and the outer conductor also has advantages for other types of coaxial cable insulations, such as in the case of cables having a characteristic impedance of 60 or 75 ohms.
  • this advantage is particularly noticeable especially in the case of greater diameters and lower characteristic impedances, e.g. in the case of low-capacitance cables.
  • a coaxial cable having an extremely small dielectric constant comprising:
  • said rope having negligible tensile strength and containing a thread-type insert of uniform tensile strength; and said rope carries said foil sheath, which sheath cylindrically covers said rope and said inner conductor and supports said outermost layer which is arranged thereon.
  • a coaxial cable according to claim 1, wherein: said foam plastic insulating material comprises polyethylene.
  • a coxial cable according to claim 2, wherein: said thread-type insert of uniform tensile strength consists of a thin thread of polyamide.
  • a coaxial cable according to claim 4 further cornprising an outer protective sheath of polyvinylchloride.
  • ROBERT K. SCHAEFER Acting Primary Examiner.

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  • Communication Cables (AREA)
US307055A 1962-09-19 1963-09-06 Low-capacitance type of high-frequency cable Expired - Lifetime US3248473A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST019733 1962-09-19

Publications (1)

Publication Number Publication Date
US3248473A true US3248473A (en) 1966-04-26

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ID=7458327

Family Applications (1)

Application Number Title Priority Date Filing Date
US307055A Expired - Lifetime US3248473A (en) 1962-09-19 1963-09-06 Low-capacitance type of high-frequency cable

Country Status (9)

Country Link
US (1) US3248473A (es)
AT (1) AT247941B (es)
BE (1) BE637567A (es)
CH (1) CH417707A (es)
DE (1) DE1590514A1 (es)
DK (1) DK109994C (es)
FI (1) FI44253B (es)
GB (1) GB982748A (es)
NL (1) NL298138A (es)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441660A (en) * 1966-07-12 1969-04-29 Gen Cable Corp Solid aluminum conductor insulated with cross-linked polyethylene
US3509266A (en) * 1965-12-10 1970-04-28 British Insulated Callenders Direct current electric cables
US6509521B1 (en) * 2000-11-10 2003-01-21 Scimed Life Systems, Inc. X-ray catheter with coaxial conductor
US6540655B1 (en) 2000-11-10 2003-04-01 Scimed Life Systems, Inc. Miniature x-ray unit
US20030147501A1 (en) * 2000-11-10 2003-08-07 Geitz Kurt Alfred Edward Heat sink for miniature x-ray unit
US20030149331A1 (en) * 2000-11-10 2003-08-07 Geitz Kurt Alfred Edward Miniature X-ray catheter with retractable needles or suction means for positioning at a desired site
US6706014B2 (en) 2000-11-10 2004-03-16 Scimed Life Systems, Inc. Miniature x-ray unit
US6752752B2 (en) 2000-11-10 2004-06-22 Scimed Life Systems, Inc. Multi-source x-ray catheter
US20040173367A1 (en) * 1998-10-05 2004-09-09 Karrmann David E. Ultra-small high-speed coaxial cable with dual filament insulator
US20080035367A1 (en) * 2006-08-11 2008-02-14 Sumitomo Electric Industries, Ltd. Coaxial cable and multi-coaxial cable
US20120040556A1 (en) * 2009-10-22 2012-02-16 Sumitomo Electric Industries, Ltd. Connecting member-terminated multi-core coaxial cable and method for manufacture thereof
US20150179306A1 (en) * 2013-12-24 2015-06-25 Belden Inc. Semi-solid unbalanced audio cable
US9355755B2 (en) 2011-04-07 2016-05-31 3M Innovative Properties Company High speed transmission cable
US20160365174A1 (en) * 2013-12-24 2016-12-15 Belden Inc. Semi-solid balanced audio cable
WO2017066745A1 (en) * 2015-10-16 2017-04-20 U.S. Patent Innovations Llc Low eletromagnetic field electrosurgical cable
US10839981B2 (en) 2011-04-07 2020-11-17 3M Innovative Properties Company High speed transmission cable

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197616A (en) * 1936-04-29 1940-04-16 Siemens Ag Air-space insulated conductor
GB529649A (en) * 1939-05-24 1940-11-26 Standard Telephones Cables Ltd Improvements in or relating to electric communication cables
US2436421A (en) * 1941-02-03 1948-02-24 Emi Ltd Flexible wave guide for ultra high frequency energy
US2556224A (en) * 1944-10-20 1951-06-12 Int Standard Electric Corp Coaxial cable having porous wound spacing means
US2814666A (en) * 1953-04-08 1957-11-26 Belden Mfg Co Electrical cable

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2197616A (en) * 1936-04-29 1940-04-16 Siemens Ag Air-space insulated conductor
GB529649A (en) * 1939-05-24 1940-11-26 Standard Telephones Cables Ltd Improvements in or relating to electric communication cables
US2436421A (en) * 1941-02-03 1948-02-24 Emi Ltd Flexible wave guide for ultra high frequency energy
US2556224A (en) * 1944-10-20 1951-06-12 Int Standard Electric Corp Coaxial cable having porous wound spacing means
US2814666A (en) * 1953-04-08 1957-11-26 Belden Mfg Co Electrical cable

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3509266A (en) * 1965-12-10 1970-04-28 British Insulated Callenders Direct current electric cables
US3441660A (en) * 1966-07-12 1969-04-29 Gen Cable Corp Solid aluminum conductor insulated with cross-linked polyethylene
US20040173367A1 (en) * 1998-10-05 2004-09-09 Karrmann David E. Ultra-small high-speed coaxial cable with dual filament insulator
US6812401B2 (en) * 1998-10-05 2004-11-02 Temp-Flex Cable, Inc. Ultra-small high-speed coaxial cable with dual filament insulator
US6540655B1 (en) 2000-11-10 2003-04-01 Scimed Life Systems, Inc. Miniature x-ray unit
US20030149331A1 (en) * 2000-11-10 2003-08-07 Geitz Kurt Alfred Edward Miniature X-ray catheter with retractable needles or suction means for positioning at a desired site
US6706014B2 (en) 2000-11-10 2004-03-16 Scimed Life Systems, Inc. Miniature x-ray unit
US6752752B2 (en) 2000-11-10 2004-06-22 Scimed Life Systems, Inc. Multi-source x-ray catheter
US20030147501A1 (en) * 2000-11-10 2003-08-07 Geitz Kurt Alfred Edward Heat sink for miniature x-ray unit
US20100266101A1 (en) * 2000-11-10 2010-10-21 Boston Scientific Scimed, Inc. Miniature x-ray unit
US6910999B2 (en) 2000-11-10 2005-06-28 Scimed Life Systems, Inc. Miniature x-ray unit
US6999559B2 (en) 2000-11-10 2006-02-14 Scimed Life Systems, Inc. Heat sink for miniature x-ray unit
US7031432B2 (en) 2000-11-10 2006-04-18 Scimed Life Systems, Inc. Miniature x-ray catheter with retractable needles or suction means for positioning at a desired site
US7901345B2 (en) 2000-11-10 2011-03-08 Boston Scientific Scimed, Inc Miniature X-ray unit
US6509521B1 (en) * 2000-11-10 2003-01-21 Scimed Life Systems, Inc. X-ray catheter with coaxial conductor
US7361831B2 (en) * 2006-08-11 2008-04-22 Sumitomo Electric Industries, Ltd. Coaxial cable and multi-coaxial cable
US20080035367A1 (en) * 2006-08-11 2008-02-14 Sumitomo Electric Industries, Ltd. Coaxial cable and multi-coaxial cable
US20120040556A1 (en) * 2009-10-22 2012-02-16 Sumitomo Electric Industries, Ltd. Connecting member-terminated multi-core coaxial cable and method for manufacture thereof
US8647149B2 (en) * 2009-10-22 2014-02-11 Sumitomo Electric Industries, Ltd. Connecting member-terminated multi-core coaxial cable and method for manufacture thereof
US9799425B2 (en) 2011-04-07 2017-10-24 3M Innovative Properties Company High speed transmission cable
US10839981B2 (en) 2011-04-07 2020-11-17 3M Innovative Properties Company High speed transmission cable
US10726970B2 (en) 2011-04-07 2020-07-28 3M Innovative Properties Company High speed transmission cable
US9355755B2 (en) 2011-04-07 2016-05-31 3M Innovative Properties Company High speed transmission cable
US10354778B2 (en) 2011-04-07 2019-07-16 3M Innovative Properties Company High speed transmission cable
US9455070B2 (en) * 2013-12-24 2016-09-27 Belden Inc. Semi-solid unbalanced audio cable
US9748022B2 (en) * 2013-12-24 2017-08-29 Belden Inc. Semi-solid balanced audio cable
US20160365174A1 (en) * 2013-12-24 2016-12-15 Belden Inc. Semi-solid balanced audio cable
US9293239B2 (en) 2013-12-24 2016-03-22 Belden Inc. Semi-solid balanced audio cable
US20150179306A1 (en) * 2013-12-24 2015-06-25 Belden Inc. Semi-solid unbalanced audio cable
WO2017066745A1 (en) * 2015-10-16 2017-04-20 U.S. Patent Innovations Llc Low eletromagnetic field electrosurgical cable

Also Published As

Publication number Publication date
BE637567A (es)
CH417707A (de) 1966-07-31
NL298138A (es)
DE1590514A1 (de) 1969-09-04
AT247941B (de) 1966-07-11
GB982748A (en) 1965-02-10
DK109994C (da) 1968-08-19
FI44253B (es) 1971-06-30

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