US3600709A - Terminal assembly for the end portion of a fluid-cooled coaxial cable - Google Patents

Terminal assembly for the end portion of a fluid-cooled coaxial cable Download PDF

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Publication number
US3600709A
US3600709A US761678A US3600709DA US3600709A US 3600709 A US3600709 A US 3600709A US 761678 A US761678 A US 761678A US 3600709D A US3600709D A US 3600709DA US 3600709 A US3600709 A US 3600709A
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United States
Prior art keywords
cable
inner conductor
conduit means
terminal assembly
conduit
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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
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US761678A
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English (en)
Inventor
Hans Leo Ditscheid
Walter Scherrer
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.)
Felten and Guilleaume Carlswerk AG
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Felten and Guilleaume Carlswerk AG
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Filing date
Publication date
Priority claimed from DE19671640104 external-priority patent/DE1640104C3/de
Application filed by Felten and Guilleaume Carlswerk AG filed Critical Felten and Guilleaume Carlswerk AG
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/20—Cable fittings for cables filled with or surrounded by gas or oil
    • H02G15/205—Cable fittings for cables filled with or surrounded by gas or oil for coaxial cables

Definitions

  • Conductor means is provided on the assembly which extends radially of the outer and inner conductors of the cable when the assembly is secured to the end portion thereof, and which is arranged to be electrically conductively connected with the inner conductor of the cable.
  • Conduit means is arranged to be axially connected with the inner conductor of the cable so as to supply fluid to or receive fluid from the inner conductor.
  • Shielding means serves to shield both the surroundings of the cable terminal and also cooling fluid flowing in the conduit means from the electromagnetic field created about the terminal when the cable transmits high frequency energy.
  • the present invention relates to coaxial high frequency cables generally, and more particularly to cable terminal assemblies for use with such cables. Still more specifically the present invention relates to cable terminal assemblies for use with coaxial high frequency cables of the type in which the inner conductor is cooled with a cooling fluid.
  • the insulating materials customarily used require that the inner conductor not exceed a temperature of between substantially 100 and 160 C.
  • technical developments call for the transmission of ever higher energies. In the case of coaxial high frequency cables this has resulted in dimensions which can not be further increased within the framework of economic possibilities.
  • Coaxial cables of this type are provided with terminal assemblies, that is arrangements which close the ends of the cable.
  • One of the functions of these terminal assemblies is to assure that the cooling fluid supplied to the inner conductor of the cable is supplied to and removed from the inner conductor in such a manner that the losses of high frequency energy which occurs in the region of the cable end portion, that is of the terminal assembly, are maintained to a minimal level.
  • the cooling fluid is supplied at the end of the coaxial cable in radial direction through the electromagnetic field of the cable to the inner conductor, or, depending upon whether the assembly is located at the upstream end or the downstream end of the cable, to remove the cooling fluid in the same manner.
  • the conduit for supplying and/or removing the cooling fluid consists of insulating material in this known construction.
  • this construction is not satisfactory because the cooling fluid must pass through a region of high field density and, furthermore, in this construction the fluid which is usually a liquid has low water column pressure. This leads to inacceptable energy losses, especially if the cooling fluid is water, combined with an increased rise in temperature of the cooling fluid. Additionally there is the dis advantageous fact that radial supply and/or removal of the cooling fluid is not only relatively difficult to achieve and requires expensive technical measures, but also does not represent a good solution from the point of view of the dynamics of fluid flow.
  • a more particular object of the invention is to provide a cable terminal assembly of the type under discussion which is not possessed of these disadvantages.
  • a concomitant object of the invention is to provide such a cable terminal assembly wherein the high frequency energy losses in the region of the terminal assembly are reduced to a minimum.
  • Still another object of the invention is to provide such a terminal assembly wherein the danger of cross modulation, particularly in the region of short and ultrashortwaves, is also niaintained at a minimum impossible level.
  • a cable terminal assembly for use with a high frequency cable of the type having an outer and a coaxial tubular fluidtight inner conductor through which a cooling fluid is to be circulated.
  • the cable terminal assembly will in known manner be secured to an end portion of the cable and comprises, in accordance with our invention, conductor means which extends radially of the inner and outer conductor of the cable when the assembly is secured to the latter, and which conductor means is arranged so that it is in the secured condition of the terminal assembly in electrically conductive contact with the inner conductor of the cable.
  • Conduit means is provided for passage of the cooling fluid therethrough and communicates with the inner conductor of the cable, constituting an axial fluid-conducting extension thereof so that fluid may be supplied to or removed from the inner conductor, depending on whether the assembly is provided at the upstream of downstream end of the cable, axially of the inner conductor.
  • the electromagnetic field of the cable terminal is shielded off by suitable shielding means with respect both to the ambient regions and to the cooling fluid.
  • FIG. 1 is a somewhat diagrammatic view, partly sectioned and partly broken away, of an end portion of a coaxial cable with a terminal assembly according to one embodiment of the invention connected thereto;
  • FIG. 2 is a view somewhat similar to that of FIG. I, but with certain portions thereof omitted as not required for an un derstanding of FIG. 2, of a further embodiment of the invention;
  • FIG. 3 is a view similar to FIG. 2 but illustrating yet an additional embodiment of the invention.
  • FIG. 4 is analogous to FIG. 1, showing another embodiment
  • FIG. 5 is analogous to FIG. 2, also showing a further embodiment.
  • FIG. 1 it will be seen that we have illustrated an end portion of a coaxial cable which comprises an outer conductor 1 and a tubular fluidtight inner conductor 1. Through the latter a cooling fluid is to be circulated so as to cool the inner conductor 1'.
  • the cable terminal assembly according to our present invention is secured to the end portion of the coaxial cable by having the end portion of the inner conductor I extend through a housing 4 of the assembly, this end portion being secured and maintained in place by a disc 2 of insulating material. How this is accomplished is of no consequence for the purposes of the present invention.
  • a suitable conductor means is provided as part of the as sembly, here identified as a conductive element 3 which extends radially of the conductors 1 and 1' but is in electrically conductive connection only with the inner conductor 1'.
  • the element 3 may serve to supply electrical energy to the inner conductor 1' or to receive it from the same. In either case, however, the supply or removal of electrical energy is accomplished in radial direction of the cable.
  • cooling fluid 6 here assumed to be water
  • a conduit 5a consisting of electrically insulating material which is in communication with the interior of the pressure and fluidtight tubular inner conductor 1 of the cable.
  • Shielding means is provided which, in the embodiment of FIG. 1, includes a flaring or funnel-shaped member 9 of metallic material which surrounds the juncture of the conduit 50 and the inner conductor I, with its wide open end facing away from the cable, and which is in electrically conductive contact with the inner conductor 1'.
  • This member 9 serves to largely shield the cooling liquid 6 passing through the conduit 5a, either into or out of the inner conductor 1' from the electromagnetic field of the cable.
  • additional shielding means in form of a shielding member 7 of substantially cylindrical cross sectional configuration which surrounds the conduit 50 and the shielding member 9 with large spacing; the member 7 is also of metallic material and is conductively connected with the outer conductor 1 of the cable 8. It serves to shield the field space of the cable 8 against the ambient space.
  • the energy losses which occur in the coupling region of the cooling liquid, that is in the region where coupling is effected between the conduit 5a and the inner conductor 1', can be reduced to a minimum.
  • FIG. 2 differs from that of FIG. I in that the conduit 51) which serves to supply or receive cooling fluid is here configurated as a coil of substantially cylindrical configuration and consists of metallic material.
  • This coil constitutes the internal conductor of a high-ohmic coaxial delay line which is unilaterally shorted, that is shorted at that point where it extends through and contacts the outer shielding member 7.
  • the latter constitutes the exterior conductor of the delay line.
  • the embodiment of FIG. 2 may be further developed by providing it with a ferrite core 11 which may be located within the confines of the convolutions of the coil constituted by the metallic conduit 5b.
  • FIG. 3 finally, again utilizes a straight conduit 5c which also consists of metallic material and which carries at its exterior extending transversely of its elongation a plurality of axially spaced metallic discs 9a.
  • a straight conduit 5c which also consists of metallic material and which carries at its exterior extending transversely of its elongation a plurality of axially spaced metallic discs 9a.
  • the conduit So with the discs 9a carried thereon constitute with the shielding member 7 a coaxial high-ohmic delay line which is again shorted at the point at which the conduit 50 extendsthrough and contacts the member 7.
  • the water column in the terminal assembly according to the present invention may be selected of sufficient height, and that it is shielded against the electromagnetic field of the cable, which latter is further shielded against ambient influences. This makes it possible to reduce the ener gy losses in the region of the terminal assembly to a minimum, which is particularly advantageous if water is used as the cooling fluid.
  • an additional advantage is the great simplicity of the construction according to the present invention.
  • FIGS. 2 and 3 make it possible to utilize a cooling fluid which need not have particularly good electrical qualities, such as water.
  • the embodiment of FIG. 3 is somewhat more advantageous than that of FIG. 2 because it permits unhindered straight line flow of liquid in the conduit 5c contrary to what is the case in FIG. 2 where the conduit 5b is convoluted as shown.
  • the cooling liquid is completely shielded from the electromagnetic field of the cable because the respective conduit consists of metallic material, so that high frequency energy losses in the cooling liquid are completely avoided which makes the use of water or a similar liquid possible.
  • the member 7 constituting the exterior conductor of the delay line which consists of the member 7 and the member 5b in FIG. 2, and the member 7 and the member 50 with its discs 9a in the embodiment of FIG. 3, serves to completely shield the field space of the cable against ambient influences and against the ambient space, so that energy radiation to the ambient space is entirely precluded.
  • the reflection factor resulting from the coupling organs remains below 5 percent even if the transmission range is greater than 2 octaves at the band ends.
  • a further reduction in the reflection factor can be obtained if, in accordance with an additional concept according to the present invention, the reflection factor caused by the delay line constituted in the embodiment of FIGS. 2 and 3 and acting as will be appreciated as a parallel resonant circuit in either case, is compensated on a broadband basis in the high frequency energy cable by a series resonant circuit consisting of concentrated circuit elements, and is placed as inner conductor of the coaxial coupling.
  • a cable terminal assembly to be secured to an end portion of the cable and comprising conductor means extending radially of said conductors when said assembly is secured to the cable and arranged to be in electrically conductive contact with said inner conductor; conduit means for passage of the cooling fluid therethrough, said conduit means communicating with and constituting an axial fluid-conducting extension of said inner conductor when said assembly is secured to the cable; and
  • shielding means shielding the ambient regions of said assembly, as well as cooling fluid in said conduit means, from the electromagnetic field which is generated when the cable transmits high frequency energy.
  • a terminal assembly as defined in claim 1 said conduit means consisting of an electrically insulating material; and wherein said shielding means comprises a flaring first metallic shielding member surrounding said conduit means in the region of the juncture thereof with said inner conductor and having a narrow end portion conductively connected with said inner conductor, and a second metallic shielding member surrounding said first member and said juncture with spacing and being conductively connected with said outer conductor.
  • said shielding means comprising a metallic shielding member surrounding the region of the juncture between said conduit means and said inner conductor, and said conduit means consisting of metallic material, said shielding means and said conduit means being constructed and cooperating in the manner of a highohmic unilaterally shorted coaxial delay line with said conduit means constituting an internal conductor for the delay line.
  • said conduit means including a straight conduit and comprising a plurality of coaxial metallic discs axially spaced from one another and extending transversely of the elongation of said tubular conduit surrounding and mounted on the same.

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  • Insulated Conductors (AREA)
  • Gas Or Oil Filled Cable Accessories (AREA)
US761678A 1967-10-06 1968-09-23 Terminal assembly for the end portion of a fluid-cooled coaxial cable Expired - Lifetime US3600709A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19671640104 DE1640104C3 (de) 1967-10-06 1967-10-06 End Verschluß für flüssigkeitsgekühlte koaxiale Hochfrequenzenergiekabel

Publications (1)

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US3600709A true US3600709A (en) 1971-08-17

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US761678A Expired - Lifetime US3600709A (en) 1967-10-06 1968-09-23 Terminal assembly for the end portion of a fluid-cooled coaxial cable

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US (1) US3600709A (de)
JP (1) JPS5019756B1 (de)
CH (1) CH483142A (de)
FR (1) FR1583347A (de)
GB (1) GB1165660A (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760306A (en) * 1970-04-24 1973-09-18 G Spinner Dielectric support for high frequency coaxial lines
US3999002A (en) * 1974-08-08 1976-12-21 Felten & Guilleaume Kabelwerke Ag Terminal connector for high-energy electric cables with internal cooling
US4382239A (en) * 1981-04-30 1983-05-03 Lovelace Alan M Administrator Waveguide cooling system
US5006825A (en) * 1987-10-16 1991-04-09 Thomson-Cf Coaxial line coupler with fluid cooled inner conductor
US20040089462A1 (en) * 2002-11-12 2004-05-13 Konrad Buckel Wide band high frequency compatible electrical coaxial cable
US9088074B2 (en) 2011-07-14 2015-07-21 Nuvotronics, Llc Hollow core coaxial cables and methods of making the same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2031975A (en) * 1930-05-14 1936-02-25 Ajax Electrothermic Corp Electrical conductor
GB491794A (en) * 1937-03-06 1938-09-06 Joseph Lade Pawsey Improvements in or relating to load resistances or the like for high frequency alternating currents
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network
US2453759A (en) * 1943-12-20 1948-11-16 Bell Telephone Labor Inc Tapered union for concentric conductor lines
DE826939C (de) * 1948-12-16 1952-01-07 Siemens & Halske A G Koaxiales oder symmetrisches Hochfrequenzenergiekabel
US2652544A (en) * 1948-12-10 1953-09-15 Sperry Corp Coaxial line connector
US2825874A (en) * 1954-03-03 1958-03-04 Itt Artificial load for broad frequency band
US3106600A (en) * 1960-06-13 1963-10-08 Gen Electric Liquid cooled transmission line
US3121204A (en) * 1960-12-23 1964-02-11 Giordano Salvatore Non-reflective liquid termination of a coaxial cable
US3292016A (en) * 1962-09-22 1966-12-13 Siemens Ag Superconducting three-phase current cable

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2031975A (en) * 1930-05-14 1936-02-25 Ajax Electrothermic Corp Electrical conductor
GB491794A (en) * 1937-03-06 1938-09-06 Joseph Lade Pawsey Improvements in or relating to load resistances or the like for high frequency alternating currents
US2432093A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Wave transmission network
US2453759A (en) * 1943-12-20 1948-11-16 Bell Telephone Labor Inc Tapered union for concentric conductor lines
US2652544A (en) * 1948-12-10 1953-09-15 Sperry Corp Coaxial line connector
DE826939C (de) * 1948-12-16 1952-01-07 Siemens & Halske A G Koaxiales oder symmetrisches Hochfrequenzenergiekabel
US2825874A (en) * 1954-03-03 1958-03-04 Itt Artificial load for broad frequency band
US3106600A (en) * 1960-06-13 1963-10-08 Gen Electric Liquid cooled transmission line
US3121204A (en) * 1960-12-23 1964-02-11 Giordano Salvatore Non-reflective liquid termination of a coaxial cable
US3292016A (en) * 1962-09-22 1966-12-13 Siemens Ag Superconducting three-phase current cable

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Andrew, Page R4 of Catalog R, Andrew Corp. P.O. Box 807, Chicago, Ill. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760306A (en) * 1970-04-24 1973-09-18 G Spinner Dielectric support for high frequency coaxial lines
US3999002A (en) * 1974-08-08 1976-12-21 Felten & Guilleaume Kabelwerke Ag Terminal connector for high-energy electric cables with internal cooling
US4382239A (en) * 1981-04-30 1983-05-03 Lovelace Alan M Administrator Waveguide cooling system
US5006825A (en) * 1987-10-16 1991-04-09 Thomson-Cf Coaxial line coupler with fluid cooled inner conductor
US20040089462A1 (en) * 2002-11-12 2004-05-13 Konrad Buckel Wide band high frequency compatible electrical coaxial cable
US9088074B2 (en) 2011-07-14 2015-07-21 Nuvotronics, Llc Hollow core coaxial cables and methods of making the same
US9570787B2 (en) 2011-07-14 2017-02-14 Nuvotronics, Inc. Hollow core coaxial cables and methods of making the same

Also Published As

Publication number Publication date
FR1583347A (de) 1969-10-24
JPS5019756B1 (de) 1975-07-09
CH483142A (de) 1969-12-15
GB1165660A (en) 1969-10-01

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