US2480106A - Concentric conductor electric cable - Google Patents

Concentric conductor electric cable Download PDF

Info

Publication number
US2480106A
US2480106A US687821A US68782146A US2480106A US 2480106 A US2480106 A US 2480106A US 687821 A US687821 A US 687821A US 68782146 A US68782146 A US 68782146A US 2480106 A US2480106 A US 2480106A
Authority
US
United States
Prior art keywords
conductor
tape
strips
tapes
concentric
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
US687821A
Other languages
English (en)
Inventor
Baguley Eric
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US2480106A publication Critical patent/US2480106A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01B11/1873—Measures for the conductors, in order to fix the spacers

Definitions

  • This invention relates to concentric conductor cables.
  • the outer conductor is built up of a plurality of metal tapes abutted together longitudinally to form seams, each edge of each tape being provided with projections interengaging with projections on the adjacent edge of another tape to hold the edges in abutting relation.
  • the projections on each edge overlie the outer side of the adjacent edge.
  • both inner and outer conductors consist of hollow tubes
  • the centre conductor may comprise one of such tapes formed into a tube, and the outer conductor form such tapes abutted together longitudinally, the projections on each edge of the tape forming the inner conductor underlying the projections on the adjacent edge so that the inner conductor presents a smooth outer perimeter.
  • an inner conductor in the form of a tube is supported within the outer conductor by means of a plurality of interengaging slotted strips of insulating material running parallel to the axis of the mid inner conductor and lying tangentially to the outer surface of said inner conductor, and engaging the inner surface of the outer conductor.
  • Fig. 1 shows a transverse cross-section of the core of a concentric conductor cable according to the invention.
  • Fig. 2 is a side elevation of the core of Fig. 1 with part of the outer conductor cut away.
  • Fig. 3 is a transverse cross-section of the core of an alternative form of concentric conductor cable according to the invention.
  • Fig. 4 is a view of one of the insulating strips used in the construction of Figs. 1 and 2 or of Fig. 3.
  • Figs. 1 and 2 show the inner and outer conductors of a concentric conductor cable according to the invention.
  • the requirement to be met is that the internal diameter of the outer tubular conductor l is to be 0.975 inch or 24.8 mm.
  • the outer diameter of the inner conductor 2 should be 0.27 inch or 6.9 mm. to preserve the optimum ratio of 3.6 between the diameters of the conductors, from the point of view of ensuring the widest transmission band for a given attenuation.
  • the inner conductor 2 is accordingly made as a hollow copper tube made by folding longitudinally a. single copper tape having projections along its edges so that the projections along the two edges interengage, those on one edge underlying those on the other edge so that the projections are on the inside of the formed tube, as shown at 3 and as described in British patent specification No. 11,723/45.
  • the outer conductor I is formed from three or four longitudinally applied notched tapes each 1.03 inches (26.2 mm.) or 0.775 inch (or 19.7 mm.) wide by 0.01 inch (0.25 mm.) to 0.015 inch (0.38 mm.) thick.
  • the outer conductor is formed of four tapes I each 0.775 inch (19.7 mm.) wide.
  • a single tape 0.775 inch (19.7 mm.) wide of 0.01 inch (0.25 mm.) thick can be formed into the central conductor 2 giving a tube of external diameter 0.255 inch (6.5 mm.) which as central conductor to the 0.975 inch (24.8 mm.) tube gives a D/d ratio of 3.82.
  • the effect of displacing this ratio from its optimum value of 3.82 is to increase the ratio frequency attenuation of the cable by only 0.15% and to increase the impedance by 4%. There is thus no serious objection to the step of facilitating the manufacture of the cable by using tape of the same size both for the inner conductor 2 and to build up the outer conductor I, one tape being used for the former and four for the latter.
  • the D/d ratio of the outer conductor i and inner conductor 2 may be brought nearer to the optimum value of 3.6, and when the tape thickness is of the internal diameter of the tube constituting the outer conductor the D/d ratio is reduced to that figure.
  • the tape thickness to ensure this ratio with the construction shown is 0.022 inch or 0.51 mm. approximately, though thinner tapes give sufliciently robust tubes and it may not be considered essential for the reasons given, to use tape of this thickness.
  • the inner conductor 2 may be lapped with a thin tape of insulating material (not shown) such as polythene or covered with a thin extended coating of polythene to keep the longitudinal seam closed until the spacers about to be described are applied thereto.
  • a thin tape of insulating material such as polythene or covered with a thin extended coating of polythene to keep the longitudinal seam closed until the spacers about to be described are applied thereto.
  • the inner conductor 2 is maintained concentrically within the outer conductor l by means of three slotted strips 5 of thin insulating material such as polystyrene parallel to the axis of the central conductor 2 and lying tangentially along its outer surface as shown in Fig. 1, with an angle of 60 between each pair of strips.
  • the slots in the strips are cut as shown in Fig. 2 and are disposed so that the slots in one of the strips permit the projecting teeth on the adjacent edge of another strip to pass through.
  • the depth of the slots and projecting teeth is such that the outer edges of the teeth just meet the inner surface of the outer conductor I.
  • the teeth and slots are dimensioned so that the teeth fit tightly into the slots and the three interengaging strips 5 form a self supporting structure around the inner conductor 2 over which the outer conductor l' is applied.
  • the cable is completed in well-known manner by applying any suitable or well-known lapping to the exterior of the outer conductor I.
  • a double lapping of steel tapes may be applied in short lay open helices breaking joint in the manner at present known in the construction of concentric conductor cables.
  • the tapes 4 may be laid up with a comparatively long lay of not less than about 56 inches or 143 cm.
  • a somewhat shorter lay is possible provided a short lay helix of copper tape is applied to the outer conductor I before applying the above mentioned steel tapes in order to screen these tapes from the spiral gap in the outer conductor.
  • the core may then be completed if desired by a thin walled tube of insulating material extruded over the screening tapes.
  • the insulating strips 5 may be applied in long or short lengths according to their thickness and thus according to the stlflness thereof. If the strips are comparatively stiff they may take the form shown in Fig. 4 and be provided at one end with a dove-tail notch 6 and at the other end with a correspondingly shaped projection I so that strips contiguous in length may be fitted together to form in eflect a continuous strip. The strips may also have holes 8 punched out therefrom to reduce the amount of solid material in the coaxial core.
  • Fig. 3 shows another embodiment of the invention in which four insulating strips 5 are built up into an interlocking self supporting structure around the inner conductor 2, the strips 5 being at to one another.
  • the core shown in Fig. 3 is completed in the same manner as described above.
  • the central conductor 2 may support an inner solid conductor spaced therefrom or additional conductors may be provided within the hollow conductor 2 as described in British patent application No. 11,723/45.
  • Concentric conductor cable having an inner conductor in the form of .a tube supported within a concentric outer conductor by means of a plurality of interengaging slotted strips of insulating material running parallel to the axis of the said inner conductor, lying tangentially to the outer surface of said inner conductor and engaging the inner surface of the outer conductor.
  • Concentric conductor cable as claimed in claim 1 having three said strips of insulating material at 60 to each other.
  • Concentric conductor cable as claimed in claim 1 having four said strips of insulating material at 90 to each other.
  • Concentric conductor cable as claimed in claim 1 wherein said strips are built up longitudinally of short interengaging strips.

Landscapes

  • Communication Cables (AREA)
US687821A 1945-06-11 1946-08-02 Concentric conductor electric cable Expired - Lifetime US2480106A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB260962X 1945-06-11

Publications (1)

Publication Number Publication Date
US2480106A true US2480106A (en) 1949-08-30

Family

ID=10238293

Family Applications (1)

Application Number Title Priority Date Filing Date
US687821A Expired - Lifetime US2480106A (en) 1945-06-11 1946-08-02 Concentric conductor electric cable

Country Status (4)

Country Link
US (1) US2480106A (pl)
BE (1) BE472515A (pl)
CH (1) CH260962A (pl)
NL (1) NL69842C (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018978A (en) * 1976-02-25 1977-04-19 I-T-E Imperial Corporation Orbital disc insulator for SF6 gas-insulated bus

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2080514A (en) * 1935-01-23 1937-05-18 Western Electric Co Conducting system
US2126290A (en) * 1936-09-11 1938-08-09 Western Electric Co Electrical cable
GB494695A (en) * 1937-04-30 1938-10-31 Standard Telephones Cables Ltd Improvements in or relating to coaxial conductor electric cables
US2165737A (en) * 1936-11-26 1939-07-11 Felten & Guilleaume Carlswerk Tubular conductor
US2210400A (en) * 1936-04-27 1940-08-06 Siemens Ag Air spaced coaxial high-frequency cable
US2355111A (en) * 1942-05-14 1944-08-08 Gen Electric Transmission line spacer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2080514A (en) * 1935-01-23 1937-05-18 Western Electric Co Conducting system
US2210400A (en) * 1936-04-27 1940-08-06 Siemens Ag Air spaced coaxial high-frequency cable
US2126290A (en) * 1936-09-11 1938-08-09 Western Electric Co Electrical cable
US2165737A (en) * 1936-11-26 1939-07-11 Felten & Guilleaume Carlswerk Tubular conductor
GB494695A (en) * 1937-04-30 1938-10-31 Standard Telephones Cables Ltd Improvements in or relating to coaxial conductor electric cables
US2355111A (en) * 1942-05-14 1944-08-08 Gen Electric Transmission line spacer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018978A (en) * 1976-02-25 1977-04-19 I-T-E Imperial Corporation Orbital disc insulator for SF6 gas-insulated bus

Also Published As

Publication number Publication date
CH260962A (de) 1949-04-15
BE472515A (pl)
NL69842C (pl)

Similar Documents

Publication Publication Date Title
US4231042A (en) Hybrid mode waveguide and feedhorn antennas
US4083484A (en) Process and apparatus for manufacturing flexible shielded coaxial cable
US2447168A (en) High-frequency electric conductors and cables
US2599857A (en) Method of manufacture of insulation for coaxial cables
US2847499A (en) Coaxial cable
US3576939A (en) Electrical cables and method of making same
US2374498A (en) Guide for the transmission of electric waves
US2322971A (en) Shielded antenna feeder lead or line
GB1294258A (en) Radiating coaxial cable and method of manufacture thereof
US2018477A (en) Coaxial conductor system
TWI827683B (zh) 線纜
US2480106A (en) Concentric conductor electric cable
US2659055A (en) Dielectric wave guide to coaxial line junction
US3020498A (en) Coupled waveguides
US2239700A (en) Wide band short wave antenna and transmission line system
US2606953A (en) High-frequency coaxial cable outer conductor
US3090019A (en) Flexible waveguide
SU446135A4 (ru) Способ изготовлени электрической катушки из ленточного проводникового материала
US3306793A (en) Method of making coaxial cables
US3629941A (en) Method of forming coaxial conductors of small diameters
US1980363A (en) Method of making electrical conductors
US2080514A (en) Conducting system
US2733288A (en) H webster
US2111651A (en) High-frequency transmission system
US3176249A (en) Waveguide impedance matching transitions while maintaining effective cross-section unchanged