US3671662A - Coaxial cable with flat profile - Google Patents

Coaxial cable with flat profile Download PDF

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Publication number
US3671662A
US3671662A US98787A US3671662DA US3671662A US 3671662 A US3671662 A US 3671662A US 98787 A US98787 A US 98787A US 3671662D A US3671662D A US 3671662DA US 3671662 A US3671662 A US 3671662A
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United States
Prior art keywords
coaxial cable
inner conductor
units
conductor
side portions
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Expired - Lifetime
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US98787A
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English (en)
Inventor
Calvin Max Miller
Robert Charles Sacks
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AT&T Corp
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Bell Telephone Laboratories Inc
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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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors

Definitions

  • PATENTS tolerances to achieve certain design objectives, such as attenuation deviation, may be appreciably relaxed with the new 2,356,166 8/1944 Lee et a1. ..174/l17 R structure. 3,136,965 6/1964 Lunden ..174/27 X 2,297,202 9/1942 Dallenbach et a1. ..174/ 28 UX 6 Claims, 16 Drawing Figures PATENTEDJum m2 3, 6T 1 ,662
  • One object of the invention is to achieve savings in material costs in a coaxial cable to be used at high frequencies.
  • a further object of the invention is to provide a coaxial cable structure that at low frequencies exhibits a self-equalizing property.
  • our coaxial cable structure is characterized by an outer conductor having rounded sides joined by flat, elongated top and bottom portions.
  • This flat coaxial cable transmission line (FCC) is further characterized by an inner and an outer conductor whose opposing surfaces are maintained at a uniform, constant mutual separation. This separation may be denoted b-a where a is the radius of curvature of the outside surface of the inner conductor and b is the radius of curvature of the inside surface of the outer conductor.
  • the opposing surfaces consist of the two semicircular end portions joined by flat portions of a width w.
  • the advantageous operating range of the overall structure is specified by the relationships: b/a and w/b 1.5.
  • a feature of our invention therefore, resides in the flattened, elongated top and bottom portions of a coaxial cable.
  • a further feature of the invention is in spacing arrangements for such a coaxial cable structure.
  • FIGS. 1A, 1B and 1C are schematic diagrams showing the structural evolution of coaxial cable into the flat coaxial line 'ofFIG. 2, and FIG. 2A.
  • FIGS. 3-8 are graphical portrayals of various comparative relationships exhibited in circular coaxial versus flat coaxial lines.
  • FIGS. 9 and 10 are schematic cross-sectional diagrams of multiple jacketed flat coaxial structures.
  • FIGS. ll, I2, and 13 are various schematic diagrams of spacers designed for the present invention.
  • FIG. 1A shows a cross section of a standard coaxial line 1, and FIG. 18 a cross section of a parallel transmission line 2.
  • FIG. 1C depicts the combining process of two parallel transmission lines 2a and 2b in a bifurcated coaxial line whose sections are designated la and lb.
  • FIG. 2 depicts in cross section the resulting flat coaxial cable line designated generally 10.
  • the line 10 consists of an outer conductor 11 having an exterior surface 12 and an interior surface 13.
  • the inner conductor is denoted 14, with exterior surface 14b.
  • both outer conductor 11 and inner conductor 14 are flat within the region denoted w.
  • the radius of curvature of the two end portions of inner conductor 14 is denoted a
  • the radius of curvature of the interior surface of the two end portions of outer conductor 11 is denoted b.
  • these curvature radii are struck from a common center, denoted 15 at the left-hand end and 16 at the right-hand end.
  • the resulting structure is shaped like a racetrack in which the opposing surfaces 13, 14b experience a constantuniform separation along all points of the structure.
  • the flat coaxial cable structure may also be thought of as a circular structure in which the inner conductor has been hollowed out and then both inner and outer conductors flattened as described above. It will be appreciated that the flattening operation for cables having a diameter greater than a few tenths of an inch, does not increase the attenuation nearly as much asit decreases the areaof the inner conductor. The material saved can be usedin part to increase the total area embraced by the outer. conductor, which decreases the attenuation to less thanthe figure which obtained before the flattening. Hence, a lower attenuation and a net savings in cost of materials results. Of course, both flattening and hollowing out achieve a further savings in materials.
  • FIG. 2A shows a flattened coaxial cable structure with the inner conductor hollowed out, the hollowed out portion being denoted by the numeral 14a.
  • Multicoax cables consisting of plurality of flattened coaxial cables, as described above, are depicted in FIGS. 9 and 10.
  • a plurality of flattened coaxial cable units or structures, each designated 20, are disposed in a line with their inner conductor centers lying in substantially the same plane.
  • the edges of adjacent structures are not in contact.
  • An extruded jacket 21 of, for example, polypropylene, is placed over the flattened coaxial cable structures 20.
  • the resulting ribbonlike structure will bend more readily than a similar structure consisting of circular coaxial cables since for the same a and 2 the thickness is less.
  • crosstalk is normally reduced because the inner conductor midpoints are spaced a greater distance than for the corresponding conventional circular coaxial cable.
  • FIG. 10 depicts a multiplicity of flattened coaxial cable structures, denoted 20a, in a diamond configuration that approximates a circle in cross section.
  • the structures 200 are not in edge contact.
  • An extruded jacket 21a is placed around the assembly.
  • the flattened portions of structures 20a advantageously are parallel to one another.
  • the inner conductor 14 is spaced from the outer conductor 13 by means of an insulating layer 30 which has been longitudinally undulated or crimped in six places as shown.
  • the layer is continuous advantageously along the entire length of the structure, its cross section being depicted as in FIG. 11.
  • two end crimps 30a, 30b contact the ends of the inner conductor 14.
  • the opposing crimps 30c, 30d contact the top and bottom surfaces respectively of inner conductor 14 adjacent to the crimp 30a.
  • the crimps 30e, 30f contact the top and bottom surfaces of inner conductor 14 adjacent to the crimp 30b.
  • the insulating material advantageously is a plastic such as polypropylene.
  • This spacer comprises basically a pair of legs 41, 42 intersecting in lattice fashion at their lengthwise midpoints.
  • the respective ends 43, 44 and 45, 46 are semicircular in shape, and are ofiset with respect to the legs 41 so that the ends 43, 45 fall in a common plane and the ends 44, 46 fall in another common plane which is parallel to that of ends 43, 45.
  • Lengthwise down the entire midsection of the legs 41, 42 are slits 47, 48. These are slightly wider than the width of inner conductor 14.
  • a number of spacers 40 are combined as end-to-end units and mounted upon the inner conductor 14.
  • the legs 41, 42 each straddle-mount the inner conductor 14, with their top and bottom sides normal to the top and bottom surfaces of inner conductor 14; and are oriented obliquely, rather than perpendicularly, to the central axis.
  • inwardly directed forces on the ends 43, 45 and ends 44, 46 bring the ends of slits 47, 48 into firm contact with the edges of inner conductor 14.
  • the ends 43-46 are substantially perpendicular to the central axis and also to the flattened surface of inner conductor 14.
  • the spacer provides honeycomblike support of the outer conductor, as well as positive central spacing of the inner conductor with respect thereto.
  • Equation (3) is normalized with respect to banda respectively.
  • Equation 1 The normalized equations for impedance from Equation 1 are:
  • FIGS. 5 and 6 are graphical representatives of Equations I0 and 11. As in attenuation, these represent the case where b and a, respectively, are held constant.
  • I for polyethylene
  • DIMENSIONAL SENSITIVITIES It should be noted from FIGS. 3 and 5 that operating a circular where N 2 or 3. The implicationsof relation (16) can be seen in F IG. 7. The heavy curve represents the normal operating range for circular coaxial cables. The specific sensitivity coefficients are:
  • FIG. 8 is a plot of the r.s.s. values of the sensitivity coefficients. For w 0, only the region representing coaxial in its normal operating range of b/a values is shown. Consequently, as before, it can be seen that it is reasonable to operate FCC in regions (b/a l0 and w/b 1.5) where sensitivities are reduced both in attenuation and impedance.
  • a coaxial cable comprising:
  • an outer conductor having semicylindrical side portions each having an interior surface radius of curvature b, and flat top and bottom surfaces each of width w joining said side portions;
  • an inner conductor having semicylindrical side portions each having an exterior surface radius of curvature a, where b a, and flat top and bottom surfaces each also of width w joining said last-named side portions;
  • spacing means for maintaining a uniform, constant material separation between said interior and exterior surfaces.
  • a multicoaxial communications cable comprising plural coaxial cable units constructed in accordance with claim 1, said units being disposed with their said inner conductors lying in substantially the same plane, the edges of adjacent said units being in noncontacting relation, and a unitary outer jacket surrounding all said units.
  • said spacing means comprises a continuous insulative layer disposed between said outer and inner conductors, said layer comprising plural longitudinal undulations extending from said outer conductor interior surface and contacting said inner conductor midway of the latters semicylindrical side portions, and
  • said spacing means comprises a plurality of units comprising first and second legs intersecting at their lengthwise midpoints, each leg having semicircular ends and a central lengthwise slit uniform, constant mutual separation denoted a-b, where a the radius of curvature of said inner conductor, and b the radius of curvature of the inside surface of said outer conductor; said surfaces comprising first and second semicircular end portions joined by flat portions of width w, and further characterized in that b/a 10 and that w/b 1.5.

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US98787A 1970-12-16 1970-12-16 Coaxial cable with flat profile Expired - Lifetime US3671662A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9878770A 1970-12-16 1970-12-16

Publications (1)

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US3671662A true US3671662A (en) 1972-06-20

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US98787A Expired - Lifetime US3671662A (en) 1970-12-16 1970-12-16 Coaxial cable with flat profile

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US (1) US3671662A (enrdf_load_stackoverflow)
JP (1) JPS4712683A (enrdf_load_stackoverflow)
AU (1) AU468809B2 (enrdf_load_stackoverflow)
BE (1) BE776638A (enrdf_load_stackoverflow)
CA (1) CA937648A (enrdf_load_stackoverflow)
CH (1) CH547553A (enrdf_load_stackoverflow)
DE (1) DE2161904A1 (enrdf_load_stackoverflow)
ES (1) ES398356A1 (enrdf_load_stackoverflow)
FR (1) FR2119974B1 (enrdf_load_stackoverflow)
GB (1) GB1369459A (enrdf_load_stackoverflow)
IT (1) IT945822B (enrdf_load_stackoverflow)
SE (1) SE383432B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768049A (en) * 1971-05-19 1973-10-23 Pirelli Helical waveguide
FR2640083A1 (fr) * 1988-12-06 1990-06-08 Thomson Csf Support pour ligne de transmission hyperfrequence, notamment du type triplaque
US5334956A (en) * 1992-03-30 1994-08-02 Motorola, Inc. Coaxial cable having an impedance matched terminating end
US6534999B2 (en) * 2000-11-16 2003-03-18 Measurement Specialties, Inc. Cable sensor
WO2006127371A1 (en) * 2005-05-25 2006-11-30 3M Innovative Properties Company Low profile high speed transmission cable
US7445471B1 (en) 2007-07-13 2008-11-04 3M Innovative Properties Company Electrical connector assembly with carrier
US20130037299A1 (en) * 2011-08-12 2013-02-14 Andrew Llc Stripline RF Transmission Cable
US20130038412A1 (en) * 2011-08-12 2013-02-14 Andrew Llc Corrugated Stripline RF Transmission Cable
US20130037300A1 (en) * 2011-08-12 2013-02-14 Andrew Llc Low Attenuation Stripline RF Transmission Cable
US10418761B2 (en) 2017-10-09 2019-09-17 Keysight Technologies, Inc. Hybrid coaxial cable fabrication
WO2024133765A1 (en) * 2022-12-22 2024-06-27 Hydro Extruded Solutions As Coaxial dual core high-voltage cable and method for manufacturing the coaxial dual core high voltage cable

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548259B2 (enrdf_load_stackoverflow) * 1972-08-11 1979-04-13
NL156879B (nl) * 1973-10-01 1978-05-16 Nederlanden Staat Verbetering van een op afstand bedienbaar elektrisch druktoestel.
JPS5435133B2 (enrdf_load_stackoverflow) * 1974-04-05 1979-10-31
DE3215036A1 (de) * 1982-04-22 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Mehrpolige koxiale leitung
JPH0212116U (enrdf_load_stackoverflow) * 1988-07-01 1990-01-25
JPH03214513A (ja) * 1990-01-18 1991-09-19 Totoku Electric Co Ltd 偏平同軸ケーブル及び多芯並列型偏平同軸ケーブル

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1912794A (en) * 1925-11-10 1933-06-06 Thomas F Peterson High tension cable
US2297202A (en) * 1936-03-07 1942-09-29 Dallenbach Walter Transmission and/or the reception of electromagnetic waves
US2356166A (en) * 1942-08-17 1944-08-22 Lee Engineering Res Corp Protective means for electrical contacts
FR956334A (enrdf_load_stackoverflow) * 1950-01-31
US2865979A (en) * 1955-10-14 1958-12-23 Teletype Corp Extensible cable structure
US3106600A (en) * 1960-06-13 1963-10-08 Gen Electric Liquid cooled transmission line
US3121136A (en) * 1960-07-04 1964-02-11 Mildner Raymond Charles Co-axial cable having inner and outer conductors corrugated helically in opposite directions
US3136965A (en) * 1960-09-22 1964-06-09 Boeing Co Electromagnetic wave guide of lunate cross section

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE472664A (enrdf_load_stackoverflow) * 1945-05-10
DE1222559B (de) * 1962-09-13 1966-08-11 Kabelwerk Vacha Veb Koaxiales Hochfrequenz-Flachkabel
US3469016A (en) * 1967-11-30 1969-09-23 Hughes Aircraft Co Interconnection between external shield and internal conductor

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR956334A (enrdf_load_stackoverflow) * 1950-01-31
US1912794A (en) * 1925-11-10 1933-06-06 Thomas F Peterson High tension cable
US2297202A (en) * 1936-03-07 1942-09-29 Dallenbach Walter Transmission and/or the reception of electromagnetic waves
US2356166A (en) * 1942-08-17 1944-08-22 Lee Engineering Res Corp Protective means for electrical contacts
US2865979A (en) * 1955-10-14 1958-12-23 Teletype Corp Extensible cable structure
US3106600A (en) * 1960-06-13 1963-10-08 Gen Electric Liquid cooled transmission line
US3121136A (en) * 1960-07-04 1964-02-11 Mildner Raymond Charles Co-axial cable having inner and outer conductors corrugated helically in opposite directions
US3136965A (en) * 1960-09-22 1964-06-09 Boeing Co Electromagnetic wave guide of lunate cross section

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768049A (en) * 1971-05-19 1973-10-23 Pirelli Helical waveguide
FR2640083A1 (fr) * 1988-12-06 1990-06-08 Thomson Csf Support pour ligne de transmission hyperfrequence, notamment du type triplaque
EP0373052A1 (fr) * 1988-12-06 1990-06-13 Thomson-Csf Support pour ligne de transmission hyperfréquence, notamment du type triplaque
US5072201A (en) * 1988-12-06 1991-12-10 Thomson-Csf Support for microwave transmission line, notably of the symmetrical strip line type
US5334956A (en) * 1992-03-30 1994-08-02 Motorola, Inc. Coaxial cable having an impedance matched terminating end
US6534999B2 (en) * 2000-11-16 2003-03-18 Measurement Specialties, Inc. Cable sensor
WO2006127371A1 (en) * 2005-05-25 2006-11-30 3M Innovative Properties Company Low profile high speed transmission cable
US7445471B1 (en) 2007-07-13 2008-11-04 3M Innovative Properties Company Electrical connector assembly with carrier
US20130037299A1 (en) * 2011-08-12 2013-02-14 Andrew Llc Stripline RF Transmission Cable
US20130038412A1 (en) * 2011-08-12 2013-02-14 Andrew Llc Corrugated Stripline RF Transmission Cable
US20130037300A1 (en) * 2011-08-12 2013-02-14 Andrew Llc Low Attenuation Stripline RF Transmission Cable
US9209510B2 (en) * 2011-08-12 2015-12-08 Commscope Technologies Llc Corrugated stripline RF transmission cable
US9577305B2 (en) * 2011-08-12 2017-02-21 Commscope Technologies Llc Low attenuation stripline RF transmission cable
US10418761B2 (en) 2017-10-09 2019-09-17 Keysight Technologies, Inc. Hybrid coaxial cable fabrication
WO2024133765A1 (en) * 2022-12-22 2024-06-27 Hydro Extruded Solutions As Coaxial dual core high-voltage cable and method for manufacturing the coaxial dual core high voltage cable

Also Published As

Publication number Publication date
CH547553A (de) 1974-03-29
ES398356A1 (es) 1975-06-16
FR2119974A1 (enrdf_load_stackoverflow) 1972-08-11
JPS4712683A (enrdf_load_stackoverflow) 1972-06-27
SE383432B (sv) 1976-03-08
CA937648A (en) 1973-11-27
GB1369459A (en) 1974-10-09
FR2119974B1 (enrdf_load_stackoverflow) 1977-07-08
BE776638A (fr) 1972-04-04
IT945822B (it) 1973-05-10
AU468809B2 (en) 1976-01-22
AU3673971A (en) 1973-06-14
DE2161904A1 (de) 1972-07-13

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