US2503834A - Shielded high-frequency cable - Google Patents

Shielded high-frequency cable Download PDF

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Publication number
US2503834A
US2503834A US668417A US66841746A US2503834A US 2503834 A US2503834 A US 2503834A US 668417 A US668417 A US 668417A US 66841746 A US66841746 A US 66841746A US 2503834 A US2503834 A US 2503834A
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US
United States
Prior art keywords
conductor
cable
surrounding
wire
frequency cable
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.)
Expired - Lifetime
Application number
US668417A
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English (en)
Inventor
Mol Evert Ary Jan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2503834A publication Critical patent/US2503834A/en
Anticipated expiration legal-status Critical
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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

Definitions

  • a solution may be found in the well-known airspace insulation.
  • the space between internal conductor or conductors and shielding means or external conductor is only partly filled with some insulating material and the part of the said space occupied by air is as large as possible.
  • the above-mentioned insulating tube is replaced by a helix consisting of polystyrene.
  • the dielectric losses as well as the dielectric constant of polystyrene are very low and practically not dependent on moisture.
  • the compression strength of a polystyrene helix is to be considered excellent and the helix which in the case of bending is mainly under strain of torsion, has suilicient flexibility.
  • An insulating material which exhibits extremely suitable electrical properties as a result of its chemical structure and is but slightly sensitive to moisture so that it is particularly suitable for replacing the insulating material already referred to above, is an insulating material built up on the basis of poiyisobutylene having a molecular weight of 100,000 to 200,000 which is very advantageous for this purpose.
  • This material as a hydrocarbon, has a low dielectric constant e and very dielectric losses; 6 is of the order of magnitude of 2.5 and the dielectric losses are practically constant over a. large temperature and frequency range. The loss angle amounts to 0.0002.
  • pression strength which conserves its mechanical and electrical properties over a very large temperature range, is obtained by providing that the insulation between the internal conductor or conductors and the shielding means of the external conductor consists of air and polyisobutylene, preferably having a molecular weight of 100,000 to 200,000, which for attaining the required compression strength is surrounded by a helically wound strengthening wire consisting of elastic material which conserves its elasticity in the temperature range.
  • the helically wound strengthening wire may consist of steel wire surrounded by the shielding means of the external conductor.
  • the elastic material should preferably not be a magnetic material, a helically wound hard copper wire or in some cases a helically wound bronze wire being chosen instead of the steel helix. It is of importance to provide this helically wound wire of elastic material under the actual screening means or external conductor, since therefor a braiding of thin soft copper wires will be used, or in some cases aluminum wire in order to obtain the required flexibility.
  • the shielding means When the shielding means are directly applied to the tube of polyisobutylene followed by surrounding it with the strengthening wire then, on bending the conductor, the shielding means or external conductor may rather easily be deformed, so that the insulating tube may become depressed or in serious cases even be perforated which will cause capacity variations.
  • Fig. 1 is a plan view of the cable according to the invention.
  • Fig. 2 is an end view of the cable according to the invention.
  • i denotes the internal copper conductor which may sometimes be provided with a layer of enamel.
  • This internal conductor l is surrounded by a much wider tube of polyisobutylene 2 surrounded by a helically wound hard copper wire 3.
  • the reference number 4 designates a surrounding braiding of soft copper wire which may be covered with a texture of paper and a textile braiding such as cotton.
  • the assembly may still be impregnated with a water repellent and abrasion resistant impregnating agent such as asphalt.
  • the internal conductor l is loose from the tube 2 and supported However, the internal conductor may be secured to additional supporting members such asdiscs of insulating material.
  • the cable according to the invention has excellent electrical properties.
  • the dielectric constant of this air-space insulation lies below that of a paper-air space insulation, but the losses are very low.
  • the cable according to the invention has excellent mechanical properties which affords the particular advantage that the range of temperature, within which the cable can be used without the risk of damaging or permanent deformation is very extensive and comprised between -50 C. and +180 C.
  • a shielded high frequency cable comprising a conductor element, a tubular member of polyisobutylene substantially filled with air and having a molecular weight between approximately 100,000 and 200,000 surrounding said conductor, and a helically wound elastic strengthening wire surrounding said tubular member.
  • a shielded high frequency cable comprising a conductor element, a tubular member of polylsobutylene substantially filled with air and having a molecular weight between approximately 100,000 and 200,000 surrounding said conductor, and a helically wound hard copper wire surrounding said tubular member.
  • a shielded high frequency cable comprising a conductor element, a tubular member of polyisobutylene substantially filled with air and having a molecular weight between approximately 100,000 and 200,000 surrounding said conductor, and a helically wound bronze wire surrounding said tubular member.
  • a shielded high frequency cable comprising a conductor element, a tubular member of polyisobutylene substantially filled with air and having a molecular weight between approximately 100,000 and 200,000 surrounding said conductor, a helically wound hard cop r wire surrounding said tubular member, a soft copper braid surrounding said hard copper wire, and an outer water repellent covering over said cop r braid.

Landscapes

  • Insulated Conductors (AREA)
  • Air Bags (AREA)
  • Details Of Indoor Wiring (AREA)
  • Helmets And Other Head Coverings (AREA)
US668417A 1942-02-02 1946-05-09 Shielded high-frequency cable Expired - Lifetime US2503834A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL611468X 1942-02-02

Publications (1)

Publication Number Publication Date
US2503834A true US2503834A (en) 1950-04-11

Family

ID=19788108

Family Applications (1)

Application Number Title Priority Date Filing Date
US668417A Expired - Lifetime US2503834A (en) 1942-02-02 1946-05-09 Shielded high-frequency cable

Country Status (4)

Country Link
US (1) US2503834A (enrdf_load_stackoverflow)
BE (1) BE449513A (enrdf_load_stackoverflow)
FR (1) FR894411A (enrdf_load_stackoverflow)
GB (1) GB611468A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636923A (en) * 1948-12-30 1953-04-28 Standard Telephones Cables Ltd Low capacitance cable and method of making the same
DK86131C (da) * 1955-11-05 1958-08-25 Sejr Jensen Tråd til et brandalarmeringsanlæg.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1094322B (de) * 1957-08-01 1960-12-08 Hirschmann Radiotechnik Verfahren zur Herstellung eines abgeschirmten, kapazitaetsarmen Kabels fuer Autoantennen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB452713A (en) * 1934-12-06 1936-08-31 Alan Dower Blumlein Improvements in cables suitable for the transmission of high frequency electric currents
US2189091A (en) * 1935-12-02 1940-02-06 Felten & Guilleaume Carlswerk Flexible high frequency cable
US2213423A (en) * 1937-04-09 1940-09-03 Standard Oil Dev Co Hydrocarbon copolymer composition
US2320313A (en) * 1939-01-26 1943-05-25 Jasco Inc Cable structure
US2379318A (en) * 1942-07-22 1945-06-26 Gen Electric High-frequency transmission line

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB452713A (en) * 1934-12-06 1936-08-31 Alan Dower Blumlein Improvements in cables suitable for the transmission of high frequency electric currents
US2189091A (en) * 1935-12-02 1940-02-06 Felten & Guilleaume Carlswerk Flexible high frequency cable
US2213423A (en) * 1937-04-09 1940-09-03 Standard Oil Dev Co Hydrocarbon copolymer composition
US2320313A (en) * 1939-01-26 1943-05-25 Jasco Inc Cable structure
US2379318A (en) * 1942-07-22 1945-06-26 Gen Electric High-frequency transmission line

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636923A (en) * 1948-12-30 1953-04-28 Standard Telephones Cables Ltd Low capacitance cable and method of making the same
DK86131C (da) * 1955-11-05 1958-08-25 Sejr Jensen Tråd til et brandalarmeringsanlæg.

Also Published As

Publication number Publication date
FR894411A (fr) 1944-12-22
BE449513A (enrdf_load_stackoverflow)
GB611468A (en) 1948-10-29

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