US3912850A - High frequency coaxial cable - Google Patents

High frequency coaxial cable Download PDF

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Publication number
US3912850A
US3912850A US402096A US40209673A US3912850A US 3912850 A US3912850 A US 3912850A US 402096 A US402096 A US 402096A US 40209673 A US40209673 A US 40209673A US 3912850 A US3912850 A US 3912850A
Authority
US
United States
Prior art keywords
outer conductor
conductor
cable
detent
arms
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
US402096A
Other languages
English (en)
Inventor
Saverio Thomas Bruno
Norbert Joseph Sladek
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.)
Bunker Ramo Corp
Original Assignee
Bunker Ramo 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 Bunker Ramo Corp filed Critical Bunker Ramo Corp
Priority to US402096A priority Critical patent/US3912850A/en
Priority to SE7411909A priority patent/SE405427B/xx
Priority to DE19742445565 priority patent/DE2445565A1/de
Priority to IT27803/74A priority patent/IT1022389B/it
Priority to FR7432940A priority patent/FR2246948A1/fr
Priority to CA210,374A priority patent/CA1015417A/en
Priority to JP49112667A priority patent/JPS5077888A/ja
Priority to NL7412874A priority patent/NL7412874A/xx
Priority to CH1322174A priority patent/CH589919A5/xx
Priority to GB42569/74A priority patent/GB1487755A/en
Application granted granted Critical
Publication of US3912850A publication Critical patent/US3912850A/en
Priority to US05/844,323 priority patent/USRE30194E/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01B11/1834—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

  • a high frequency coaxial cable constructed in accordance with the invention includes a corrugated outer conductor with spaced interior convolutionspresenting flat inner surfaces, an inner conductor disposed axially within the outer conductor, a dielectric around the innerconductor with axially aligned arms extending to the outer conductor, and inwardly extending detents spaced along the flat inner surfaces of the outer conductor in compressive engagement with the arms of the dielectric member to lock the dielectric member in a desired position and to form a minimum inner diameter of the outer conductor.
  • FIG. 1 is a partial sectional view of a coaxial cable comprising one embodiment of the present invention
  • FIG. 2 is a sectional view of the cable taken approximately along line 2-2 of FIG. I;
  • FIG. 3 is an enlarged view of an element of the cable, taken as indicated by outline 3-3 in FIG. 1.
  • FIG. 1 shows a coaxial cable constructed in accordance with one embodiment of the invention and comprising a corrugated outer conductor with interlock- .ing portions 11 and interior convolutions 12.
  • Interior convolutions 12 have essentially flat inner surfaces which are better seen in FIG. 3. Along each of the inner surfaces is an inwardly extending detent 13, the importance of which will be described later.
  • the interlocking portions 11 of the outer conductor 10 are connected by solder 14.
  • the inside surface of the outer conductor is plated with a high conductivity metal such as silver or gold.
  • the arrows A in FIG. 3 shows essentially where the inner surfaces are silver plated or plated with a high conductivity metal.
  • a wire mesh braid 15 and a plastic outer jacket 16 surround the outer conductor 10.
  • An inner conductor 20 is disposed coaxially within the outer conductor 10.
  • a dielectric member 21 is molded around the inner conductor 20 and includes arms 22, 23 and 24 extending radially outwardly from the inner conductor and pressing against the outer conductor 10.
  • the dielectric member 21 is made of polytetrafluorothylene, though other dielectric materials can be used.
  • the space 25 not occupied by 'the dielectric member 21 is filled with air, which also serves as a dielectric.
  • a feature of the invention is the inwardly extending detent 1 3, which is spaced along the flat inner surface 12 of the outer conductor 10.
  • the outer conductor 10 comprises a series of spirally wound adjacent turns with the wall portion of each turn between opposite edges of each turn offset radially inwardly from the opposite edges.
  • the opposite edges of each turn are in folded back overlapping radially spaced relationship with an adjacent portion of each edge for nestingly receiving there-between the edge of the adjacent turn to interlock the adjacent turns. Soldering the interlocked edges and silver plating the inner surfaces of the outer conductor provides a continuous metal or conductive path between turns.
  • the spirally extending detent or detent means 13 is formed along the radially inwardly spaced surface of the outer conductor and it engages the radially outwardly spaced end surface of the axially and radially extending equi-circumferentially spaced arms 22, 23 and 24 of the dielectric member 21.
  • the outer conductor 10 provides a path which is continuous to RF signals.
  • the center conductor 20 consists of silver plated stranded wire, though a solid conductor may be used if desired.
  • the airpolytetrafluorothylene construction lowers the dielectric constant and decreases the dielectric losses of the cable.
  • the diameter of the outer conductor 10 should be consistent and the width of the convolutions should be equal.
  • the core dielectric member 21 is locked to the outer conductor 10 by means of mechanical compression. This procedure keeps the core and its center conductor 20 from moving relative to the outer conductor 10. This provides excellent alignment even when the cable is subjected to flexure or impact.
  • the impedance of the cable is controlled by the amount of compression of the outer diameter.
  • the impedance of the coaxial cable is calculated from the equation:
  • DM is the mean diameter of the outer conductor inner diameter
  • ID is the outer diameter of the inner conductor
  • E is the effective dielectric constant of the core components.
  • the insertion loss of the cable is computed by the summation of the inner conductor loss, the dielectric loss, and the outer conductor loss.
  • the inner conductor loss and dielectric loss are computed by using standard microwave equations for insertion loss.
  • the outer conductor loss is derived from standard equations, except that the added transmission line length due to the convolutions must be incorporated into the calculations.
  • the cable provides a low reflection coefficient (VSWR), high electrical phase stability under stress, and high consistency in phase tracking.
  • VSWR low reflection coefficient
  • measurements of less than 0.35 dB per foot at 16 GHz, less than O.l4dB per foot at 8 ghz, and less than 0.065 dB per foot at 2 GHz have been recorded for a 50 ohm transmission line.
  • the detent in the outer conductor can be formed prior to assembly to conform to calculated standards.
  • An on-line assembly procedure includes, forming a corrugated outer conductor with spaced interior convolutions presenting flat inner surfaces, forming a dielectric core around an inner conductor, the dielectric core having a plurality of axially aligned arms, inserting the inner conductor and dielectric core axially within the outer conductor, and forming a plurality of inwardly extending detents spaced along the flat inner surfaces of the outer conductor to form a minimum inner diameter of said outer conductor.
  • the detents can be formed while forming the outer conductor or the detents can be added or varied after the inner conductor, outer conductor, and dielectic core are assembled.
  • the impedance of the cable can be measured and the projection of the detent can be varied to vary the impedance to the desired range, the cable can then be enclosed in the wire mesh and plastic jacket.
  • silver plating the inside surface of the outer conductor this step is preferably done before the assembly of the inner conductor, outer conductor, and dielectric core.
  • a high frequency coaxial cable comprising;
  • At leastone inner conductor disposed axially within the outer conductor
  • a coaxial cable for use in transmitting high frequency electrical signals comprising:
  • a dielectric member extending axially of said inner and outer conductors secured to said inner conductor and having a plurality of axially extending circumferentially spaced arms extending radially toward said outer conductor;
  • detent means on said outer conductor extending radially inwardly from said outer conductor in movement restraining relationship to said arms for holding said dielectric member and inner conductor against movement relative said outer conductor with the radial position of said detent means located for controlling an electrical characteristic of said cable.

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  • Communication Cables (AREA)
  • Multi-Conductor Connections (AREA)
  • Manufacturing Of Electric Cables (AREA)
US402096A 1973-10-01 1973-10-01 High frequency coaxial cable Expired - Lifetime US3912850A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US402096A US3912850A (en) 1973-10-01 1973-10-01 High frequency coaxial cable
SE7411909A SE405427B (sv) 1973-10-01 1974-09-23 Hogfrekvenskoaxialkabel innefattande en korrugerad ytterledare samt forfarande for dess framstellning
DE19742445565 DE2445565A1 (de) 1973-10-01 1974-09-24 Hochfrequenz-koaxialkabel und verfahren zu seiner herstellung
IT27803/74A IT1022389B (it) 1973-10-01 1974-09-27 Cavo coassiale ad alta frequenza
CA210,374A CA1015417A (en) 1973-10-01 1974-09-30 High frequency coaxial cable
JP49112667A JPS5077888A (enExample) 1973-10-01 1974-09-30
FR7432940A FR2246948A1 (enExample) 1973-10-01 1974-09-30
NL7412874A NL7412874A (nl) 1973-10-01 1974-09-30 Coaxiale kabel voor hoge frequenties.
CH1322174A CH589919A5 (enExample) 1973-10-01 1974-10-01
GB42569/74A GB1487755A (en) 1973-10-01 1974-10-01 High frequency coaxial cable
US05/844,323 USRE30194E (en) 1973-10-01 1977-10-11 High frequency coaxial cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US402096A US3912850A (en) 1973-10-01 1973-10-01 High frequency coaxial cable

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/844,323 Reissue USRE30194E (en) 1973-10-01 1977-10-11 High frequency coaxial cable

Publications (1)

Publication Number Publication Date
US3912850A true US3912850A (en) 1975-10-14

Family

ID=23590505

Family Applications (1)

Application Number Title Priority Date Filing Date
US402096A Expired - Lifetime US3912850A (en) 1973-10-01 1973-10-01 High frequency coaxial cable

Country Status (10)

Country Link
US (1) US3912850A (enExample)
JP (1) JPS5077888A (enExample)
CA (1) CA1015417A (enExample)
CH (1) CH589919A5 (enExample)
DE (1) DE2445565A1 (enExample)
FR (1) FR2246948A1 (enExample)
GB (1) GB1487755A (enExample)
IT (1) IT1022389B (enExample)
NL (1) NL7412874A (enExample)
SE (1) SE405427B (enExample)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451718A (en) * 1993-04-08 1995-09-19 Southwire Company Mechanically bonded metal sheath for power cable
US6180877B1 (en) * 1996-09-09 2001-01-30 Thomson-Csf Communications Electrical conductor protected against electromagnetic interference exceeding a threshold
WO2004013870A1 (ja) * 2002-08-06 2004-02-12 Ube-Nitto Kasei Co., Ltd. 細径同軸ケーブルおよびその製造方法
US20140299348A1 (en) * 2013-04-08 2014-10-09 Nexans Data transmission cable intended for the aeronautical industry
US20230105524A1 (en) * 2021-10-05 2023-04-06 Totoku Electric Co., Ltd. Coaxial cable
US20230282394A1 (en) * 2022-03-07 2023-09-07 John Mezzalingua Associates, LLC Radio frequency (rf) plenum cable with reduced insertion loss

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2428895A1 (fr) * 1978-06-13 1980-01-11 Fileca Cable a haute immunite a blindage mince
FR2747832B1 (fr) * 1996-04-23 1998-05-22 Filotex Sa Procede et dispositif de fabrication d'une gaine aeree en un materiau isolant autour d'un conducteur, et cable coaxial muni d'une telle gaine
JP2006108030A (ja) * 2004-10-08 2006-04-20 Mitsubishi Cable Ind Ltd 同軸ケーブル

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189091A (en) * 1935-12-02 1940-02-06 Felten & Guilleaume Carlswerk Flexible high frequency cable
US2337556A (en) * 1939-02-03 1943-12-28 Composite Rubber Products Corp Cable
US2437482A (en) * 1942-12-07 1948-03-09 Nasa High-frequency electrical transmission line
US3271506A (en) * 1964-03-25 1966-09-06 Siemens Ag Coaxial high-frequency cable with internal spacers
US3585270A (en) * 1968-07-31 1971-06-15 John George Trump Gas-insulated transmission line
US3683103A (en) * 1971-07-07 1972-08-08 J & J Equity Co Multi-strand electrical conductor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2189091A (en) * 1935-12-02 1940-02-06 Felten & Guilleaume Carlswerk Flexible high frequency cable
US2337556A (en) * 1939-02-03 1943-12-28 Composite Rubber Products Corp Cable
US2437482A (en) * 1942-12-07 1948-03-09 Nasa High-frequency electrical transmission line
US3271506A (en) * 1964-03-25 1966-09-06 Siemens Ag Coaxial high-frequency cable with internal spacers
US3585270A (en) * 1968-07-31 1971-06-15 John George Trump Gas-insulated transmission line
US3683103A (en) * 1971-07-07 1972-08-08 J & J Equity Co Multi-strand electrical conductor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5451718A (en) * 1993-04-08 1995-09-19 Southwire Company Mechanically bonded metal sheath for power cable
US6180877B1 (en) * 1996-09-09 2001-01-30 Thomson-Csf Communications Electrical conductor protected against electromagnetic interference exceeding a threshold
WO2004013870A1 (ja) * 2002-08-06 2004-02-12 Ube-Nitto Kasei Co., Ltd. 細径同軸ケーブルおよびその製造方法
US20050230145A1 (en) * 2002-08-06 2005-10-20 Toku Ishii Thin-diameter coaxial cable and method of producing the same
US20140299348A1 (en) * 2013-04-08 2014-10-09 Nexans Data transmission cable intended for the aeronautical industry
US20230105524A1 (en) * 2021-10-05 2023-04-06 Totoku Electric Co., Ltd. Coaxial cable
US11728069B2 (en) * 2021-10-05 2023-08-15 Totoku Electric Co., Ltd. Coaxial cable
US20230282394A1 (en) * 2022-03-07 2023-09-07 John Mezzalingua Associates, LLC Radio frequency (rf) plenum cable with reduced insertion loss

Also Published As

Publication number Publication date
FR2246948A1 (enExample) 1975-05-02
GB1487755A (en) 1977-10-05
NL7412874A (nl) 1975-04-03
SE7411909L (enExample) 1975-04-02
DE2445565A1 (de) 1975-04-10
JPS5077888A (enExample) 1975-06-25
SE405427B (sv) 1978-12-04
CA1015417A (en) 1977-08-09
CH589919A5 (enExample) 1977-07-29
IT1022389B (it) 1978-03-20

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