US2216893A - Concentric conductor transmission line - Google Patents

Concentric conductor transmission line Download PDF

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Publication number
US2216893A
US2216893A US197765A US19776538A US2216893A US 2216893 A US2216893 A US 2216893A US 197765 A US197765 A US 197765A US 19776538 A US19776538 A US 19776538A US 2216893 A US2216893 A US 2216893A
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US
United States
Prior art keywords
conductor
concentric
inner conductor
insulators
line
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
US197765A
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English (en)
Inventor
Phillip H Smith
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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 Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US197765A priority Critical patent/US2216893A/en
Priority to FR852037D priority patent/FR852037A/fr
Application granted granted Critical
Publication of US2216893A publication Critical patent/US2216893A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01B11/1873—Measures for the conductors, in order to fix the spacers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49194—Assembling elongated conductors, e.g., splicing, etc.

Definitions

  • This invention relates to concentric conductor transmission lines, and more particularly to arrangements for retaining concentric spacing between the conductors of such lines.
  • One form of concentric conductor line known heretofore comprises a tubular inner conductor disposed in a tubular outer conductor and spaced concentrically therefrom by insulating rings or the like mounted on the periphery of the inner
  • insulating rings are held in place on the inner conductor in one of the following ways: (a) friction, (b) crimping the inner conductor on both sides of the insulating ring, soldering metal rings on the inner conductor or both sides of the insulating ring and (d) springing resilient wires on the inner conductor on both sides of each insulator.
  • these insulating rings create gaps between themselves and the inner conductor along a radial extending from the center of the line, and in addition, introduced between the inner and outer conductors a relatively large mass of material which has a high dielectric constant compared to air or gas surrounding it and which. in addition to increasing the-dielectric losses that are proportional to the mass of this material, alters the distribution of the voltage gradient on the outer surface of the inner conductor.
  • This distribution would be uniform for a line assumed to have a uniform air or gas dielectric interven ing exclusively between the inner and outer conductors, or a line provided with insulators having a dielectric constant equivalent to that of the surrounding air,or gas, if such were possible.
  • a solid material having a dielcc tric constant equivalent to that of air or gas is physically non-existent, the nearest approac the desired condition of a uniform air or ga electric is realized with an insulator having mitts mum mass.
  • Concentric conductor lines may be used in the transmission of high frequency signals in the manner disclosed in'the patent of L. Espen Kunststoffet al. No. 1,835,031, issued December 8, 1931.
  • the invention comprises a ductor is provided with a plurality of pairs of diametrically aligned openings spaced therealong in such manner that adjacent pairs are singularly disposed relative to each other.
  • an elon ed is the outer conductor. This arrangemen concentric spacing of the inner conductor wi the same amount of air dielectric at all points along the line.
  • Fig. 1 is a sectional view of a concentric conductor illustrating one form of insulator in accordance with the present invention
  • Fig. 2 is an end view of Fig. 1;
  • Figs. 3, 4, 5, 6 and '7 are sectional views of a concentric conductor showing other forms of insulators contemplated in the present invention.
  • Fig. 8 is an end view of Fig. '7.
  • Fig. 1 shows a concentric conductor comprising outer conductor I and inner conductor 6.
  • the latter is provided with a plurality of pairs of diametrically aligned openings H and IS, the pairs being spaced at intervals therealong.
  • opening I"! has a diameter that is preferably larger than that of opening l8.
  • each opening I! is angularly disposed 120 degrees relative to adjacent openings l1 and each opening
  • on the opposite end is positioned in each pair of openings H and l8 such that the projection ii is inserted in the opening l8 and the rounded end 20 engages the inner surface of the outer conductor substantially in a. pointcontac't.
  • the diameters of the openings ll and I8 are such that the insulators l8 fit tightly therein so as to permit a minimum amount of air dielectric to intervene between the inner conductor and each insulator.
  • each opening I"! is preferably formed with a rounded edge. This rounding has also been found desirable electrically.
  • Fig. 3 illustrates an insulator assembly comprising diametrically cooperating members and 3
  • the member 30 comprises a cylindrical portion 32 terminating in a rounded end 33 and a reduced cylindrical portion 34 terminating in a V-shaped end 35.
  • consists of a cylindrical portion 36 terminating in a.
  • the inner conductor is provided with a plurality of pairs of diametrically aligned openings 40, spaced at intervals therealong. Each insulator is assembled by so disposing reduced portions 34 and 38 in openings 40, 40 such that each wedge-shaped end 39 is seated in each V-shaped end 35.
  • Adjacent pairs of aligned openings 40, 40 may be angularly disposed and provided with diameters to accommodate the reduced portions 34 and 38 in the manner described above in connection with Fig. 1.
  • Fig. 4 delineates an insulator assembly comprising an elongated cylindrical member 44 having rounded opposite ends and positioned in diametrically aligned openings 45, 45, provided in the inner conductor as described above in connection with Fig. 3. Over each end of the member 44 is placed a. sleeve 46 of suitable insulating material and whose one end engages the inner surface of the outer conductor and the opposite end engages the outer surface of the inner conductor. Adjacent insulator assemblies are shown angularly disposed at 90 degrees although these may also be angularly disposed similarly as the insulators shown and described in connection with Fig. 1.
  • Fig. 5 shows an insulator assembly in which diametrically aligned openings 50, 50 are provided with threads to receive the threaded ends of diametrically aligned insulating members 5
  • are angularly disposed at 90 degrees, although these may also be angularly disposed as the insulators shown and described in connection with Fig. 1.
  • Fig. 6 is similar to Fig. 4 except elongated insulator is held in place by a transverse insulating pin 6
  • Figs. '7 and 8 are generally similar to Figs. 1 and 2.
  • Fig. 7 illustrates an insulator 10 comprising a cylindrical portion H and a reduced cylindrical portion 12 which is disposed in diametrically aligned openings l3, 13 provided in the inner conductor.
  • and 12 and engaging the outer surface of the inner conductor is preferably shaped in a curvilinear manner so as to be readily fitted to inner conductors of various diameters.
  • Fig. 8 shows adjacent insulators disposed angularly at degrees, although it is evident this disposition can be 90 degrees, or any desired angular relation.
  • pin-type insulators with their minimum mass of high dielectric material intervening between the inner and outer conductors tend to cause minimum dielectric losses and also minimum disturbances in the distribution of the potential gradient on the outer surface of the inner conductor.
  • signaling voltages that are substantially equivalent in magnitude to voltages allowed by a line of the same dimensions having air or gas dielectric intervening exclusively between the inner and outer conductors, or an air or flashover, and therefore may be transmitted thereover with increased efficiency.
  • a pin-type insulating arrangement of the character described above lends itself to the facile assembly of a concentric conductor line or the expeditious replacement of defective insulators. In the latter event a defective insulator can be removed and replaced without disturbing the other insulators which is not so in the case of ring-type insulators as all insulators leading to the defective one must be removed before the latter can be replaced.
  • openings in the inner conductor may be formed with rounded edges as shown relative to opening I! in Fig. 1 for the reason mentioned above in connection therewith.
  • a concentric conductor transmission line comprising solid-walled tubular inner and outer conductors, said inner conductor having a plurality of pairs of diametrically aligned openings, each pair of openings being angularly disposed relative to adjacent pairs, and insulators for retaining concentric spacing between said conductors, each of said insulators engaging the inner surface of the outer conductor on diametrically opposite points and comprising an elongated member positioned in each pair of openings and a sleeve disposed on each of the opposite ends of said elongated member so as to extend be- PM H. mm.

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US197765A 1938-03-24 1938-03-24 Concentric conductor transmission line Expired - Lifetime US2216893A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US197765A US2216893A (en) 1938-03-24 1938-03-24 Concentric conductor transmission line
FR852037D FR852037A (fr) 1938-03-24 1939-03-23 Câbles électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US197765A US2216893A (en) 1938-03-24 1938-03-24 Concentric conductor transmission line

Publications (1)

Publication Number Publication Date
US2216893A true US2216893A (en) 1940-10-08

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US197765A Expired - Lifetime US2216893A (en) 1938-03-24 1938-03-24 Concentric conductor transmission line

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US (1) US2216893A (fr)
FR (1) FR852037A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436284A (en) * 1946-12-26 1948-02-17 Lewis A Bondon Coaxial transmission line
US2445380A (en) * 1944-02-16 1948-07-20 Girdler Corp Coaxial transmission line
US2701864A (en) * 1947-06-21 1955-02-08 Emi Ltd Aerial feeder
DE1033289B (de) * 1955-09-30 1958-07-03 Siemens Ag Reflexionsarme Halterung aus Isolierstoff fuer den Innenleiter von koaxialen Anordnungen
US3151925A (en) * 1961-10-25 1964-10-06 Lewis A Bondon Coaxial tranmission line utilizing reactance compensated, paired pintype insulator spcing assembly
US3299492A (en) * 1963-08-14 1967-01-24 Simmonds Precision Products Electroformed inner tube for tank unit
US3512252A (en) * 1965-04-22 1970-05-19 Simmonds Precision Products Electroformed inner tube for tank unit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4444554C2 (de) * 1994-12-01 1997-01-09 Siemens Ag Gekapselte elektrische Hochspannungsleitung
JP2001526880A (ja) 1997-05-29 2001-12-18 シーメンス アクチエンゲゼルシヤフト 柱状支持体により支持された内部導体を備えたガス絶縁管導体装置

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2445380A (en) * 1944-02-16 1948-07-20 Girdler Corp Coaxial transmission line
US2436284A (en) * 1946-12-26 1948-02-17 Lewis A Bondon Coaxial transmission line
US2701864A (en) * 1947-06-21 1955-02-08 Emi Ltd Aerial feeder
DE1033289B (de) * 1955-09-30 1958-07-03 Siemens Ag Reflexionsarme Halterung aus Isolierstoff fuer den Innenleiter von koaxialen Anordnungen
US3151925A (en) * 1961-10-25 1964-10-06 Lewis A Bondon Coaxial tranmission line utilizing reactance compensated, paired pintype insulator spcing assembly
US3299492A (en) * 1963-08-14 1967-01-24 Simmonds Precision Products Electroformed inner tube for tank unit
US3512252A (en) * 1965-04-22 1970-05-19 Simmonds Precision Products Electroformed inner tube for tank unit

Also Published As

Publication number Publication date
FR852037A (fr) 1940-01-22

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