|Publication number||US2556244 A|
|Publication date||Jun 12, 1951|
|Filing date||Oct 22, 1946|
|Priority date||Sep 7, 1945|
|Publication number||US 2556244 A, US 2556244A, US-A-2556244, US2556244 A, US2556244A|
|Inventors||Kirby Weston William|
|Original Assignee||Int Standard Electric Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (74), Classifications (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
June 12, 1951 W. K. WESTON COAXIAL CABLE WITH HELICALLY WOUND SPACER Filed Oct. 22, 1946 7am can INVENTOR- AM K4 WESTON ATTORNEY Patented June 12, 1951 COAXIAL CABLE WITH HELICALLY WOUND SPACER William Kirby Weston, London, England, assignor to International Standard Electric Corpora tion, New York, N. Y.
Application October 22, 1946, Serial No. 704,968 In Great Britain September 7, 1945 2 Claims.
This invention relates to high frequency electric cables of the coaxial conductor type.
In some instances it is advisable to form the inner conductor of a coaxial cable as a hollow tube, as for example when the coaxial cable is made of large diameter, in which case a solid central conductor would unduly increase the weight of the cable. It may be desirable to use the hollow tube functioning as an inner conductor as the outer conductor of a second coaxial cable the inner conductor of which is supported centrally within the hollow tube.
This inner conductor may be formed of a single tape or of a plurality of tapes, but in the interest of minimum attenuation it is desirable that any discontinuities formed by the abutting edges of the tapes should run longitudinally of the cable or as nearly so as possible and thus that the tape or tapes should be folded longitudinally. The edges of these tapes should be held together under pressure, and this may be accomplished by a binding of insulating tapes. This arrangement has been proposed in our U. S. application No. 667,272 filed May 4, 1946, entitled Improvements in or relating to concentric conductor electric cables, now abandoned, which also proposes as a preferred alternative that a layer of a dielectric material be extended over the inner hollow conductor to maintain the latter in circular form. It is also proposed in that application to fill the-whole space between inner and outer conductors with solid dielectric material.
It is, however, desirable to keep the volume of solid dielectric between the inner and outer conductors to a minimum as is well known, and in our U. S. application No. 695,027, filed September 5, 1946, now Patent No. 2,480,170, entitled Improvements in or relating to electric cables for high frequency, it is proposed to use spaces composed of dielectric material formed in two or more portions, which when placed together to form a complete washer exert a wedging action upon the tape over the greater part or the hole of the length of the inner conductor. These wedge spacers may be held in place by means of insulative tape or by a thin wall of insulating material extended around them, or, again, by forming the outer conductor immediately around them.
According to the present invention there is provided high frequency electric cable of the coaxial conductor type comprising a hollow inner conductor formed of one or more metallic tapes folded longitudinally in which spacing means between said inner conductor and the outer conductor is provided by one or more helices of low loss dielectric material wound about said inner conductor. These helical spacers may of themselves hold together the edges of the tape or tapes of said inner conductor or alternatively these edges may be held together under pressure by a distinct helix or group of helices of low loss material. This material must not be confused with the insulating tape mentioned above, but would be of substantial thickness compared thereto. Further, it is preferred that the material should be hollow or corrugated so as to form a cross-section the area of which is only partially occupied by solid dielectric.
The invention will now be described in more detail with reference to the accompanying drawings in which Fig. 1 illustrates a cross-section of an electric cable embodying features according to the present invention.
Figure 2 is a cross-sectional view of a high frequency electric cable embodying the present invention in a preferred manner.
In Figs 1' and 2 the inner conductor l of a large diameter coaxial cable consists of a single copper tape folded longitudinally, the edges of the tape abutting as shown at 2. Around thi hollow inner conductor are wound spirally hollow tubes 3 of low loss dielectric material and such as a solid ethylene polymer.
These tubes may be wrapped with insulating tape, 4, of similar material. In the cable illustrated in Fig. 1 the hollow tubes are spaced about the inner conductor without adjacent turns touching, a further group of helical spacers, 5, are wrapped about the first group. The spacers of this second group are shewn as having a corrugated cross-section. Low loss insulating material of any convenient cross-sectional shape may be used in place of those shewn at 3 and 5, but it is to be preferred that the cross-sectional area defined thereby should only partially be occupied by the solid dielectric. It is also to be preferred that the lay of thesecond set of helices be in the opposite sense to that of the first group. This second group of spacing elements may also be wrapped with insulating tape 6 if desired. The first group may be considered functionally as means for holding together under pressure the edges 2 of the inner conductor, while the insulators 5 serve primarily as spacing members in addition to 3.
In both Figs. 1 and 2, outer conductors I are provided by any of the usual arrangements. The spacers inside the hollow inner conductors i may each accommodate, for example, a further conductor 8 separated from conductor I by means of the usual washers 9.
In Fig. 2 it will be observed that six helices 3 are provided and that the insulators are of the same diameter as the inner conductor l. Neglecting the thickness of tape 4 this arrangement would provide a cable with a ratio outer/inner conductors of 3:1. It is well known, that in order to obtain a minimum attenuation constant, this ration should be approximately 3.6 to 1. With a multiple grouping of spacing helices as in Fig. 1 there is no difficulty in arranging this, but there is much to be said for having the insulators touching one another and forming a single group to lock the inner conductors edges 2 and simultaneously to provide the necessary spacing means. Accordingly, in a further preferred embodiment, the insulating members 3 of Fig. 2 are made over size and squeezed into position in contact with adjacent members and with the inner conductor; their cross-section is thereby deformed from being circulated with the result that they may be made to take up the extra radialspace to provide the correct ratio of diameters for the two conductors.
Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, We .declare that what we claim is:
l. A high frequency coaxial cable that comprises a tubular inner conductor formed of a metaltape longitudinally folded whereby its longitudinal edges are disposed in opposed relationship; a plurality of tubular spacers, formed of insulating material and wound side by side helically around the inner conductor; and a tubular outer conductor surrounding the helically wound spacers, having a diameter related to the diameter of. the inner conductor in approximately the ratio of 3.6 l, the'diameter of the tubular spacers being such that they are compressed and distorted by the outer conductor and press against the inner conductor in a manner causing the 0pposing longitudinal edges of the folded tape to press against each other.
2. A high frequency coaxial cable according to claim 1 further characterized in that a layer of insulating tape is helically wound around the helically wound spacers, the lay of the tape being in an opposite sense to the lay of the spacers.
WILLIAM KIRBY WESTON.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,859,390 Green May 24, 1932 1,978,418 Dudley Oct. 30, 1934 2,116,267 Klimmer May 3, 1938 2,381,003 Ryan Aug. 7, 1945 FOREIGN PATENTS Number Country Date 526,702 Great Britain Sept. 24, 1940
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1859390 *||May 23, 1929||May 24, 1932||American Telephone & Telegraph||Concentric conductor system|
|US1978418 *||Oct 8, 1930||Oct 30, 1934||Bell Telephone Labor Inc||Concentric return multiconductor cable|
|US2116267 *||Nov 15, 1935||May 3, 1938||Felten & Guilleaume Carlswerk||Conductor with air space insulation|
|US2381003 *||Nov 5, 1942||Aug 7, 1945||Fed Telephone & Radio Corp||Insulated electric conductor|
|GB526702A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2847499 *||Jun 16, 1954||Aug 12, 1958||Preformed Line Products Co||Coaxial cable|
|US2998472 *||Apr 23, 1958||Aug 29, 1961||Bondon Lewis A||Insulated electrical conductor and method of manufacture|
|US3055967 *||May 29, 1961||Sep 25, 1962||Bondon Lewis A||Coaxial cable with low effective dielectric constant and process of manufacture|
|US3126438 *||Dec 2, 1960||Mar 24, 1964||Lorrin|
|US3750058 *||Dec 8, 1971||Jul 31, 1973||Bell Telephone Labor Inc||Waveguide structure utilizing compliant helical support|
|US4705914 *||Nov 10, 1986||Nov 10, 1987||Bondon Lewis A||High voltage flexible cable for pressurized gas insulated transmission line|
|US4767890 *||Nov 17, 1986||Aug 30, 1988||Magnan David L||High fidelity audio cable|
|US4963420 *||May 15, 1987||Oct 16, 1990||Institut Francais Du Petrole||Filler and floatability material - manufacturing process and tubular units that incorporate this material|
|US5742002 *||Jul 20, 1995||Apr 21, 1998||Andrew Corporation||Air-dielectric coaxial cable with hollow spacer element|
|US5796046 *||Jun 24, 1996||Aug 18, 1998||Alcatel Na Cable Systems, Inc.||Communication cable having a striated cable jacket|
|US7115815||Dec 26, 2003||Oct 3, 2006||Adc Telecommunications, Inc.||Cable utilizing varying lay length mechanisms to minimize alien crosstalk|
|US7124724 *||Feb 15, 2005||Oct 24, 2006||Champion Aerospace, Inc.||Air-cooled ignition lead|
|US7214880||Mar 14, 2003||May 8, 2007||Adc Incorporated||Communication wire|
|US7214884||Dec 26, 2003||May 8, 2007||Adc Incorporated||Cable with offset filler|
|US7220918||Mar 24, 2005||May 22, 2007||Adc Incorporated||Cable with offset filler|
|US7220919||Mar 24, 2005||May 22, 2007||Adc Incorporated||Cable with offset filler|
|US7238886||Mar 1, 2004||Jul 3, 2007||Adc Incorporated||Communication wire|
|US7271344||Mar 9, 2006||Sep 18, 2007||Adc Telecommunications, Inc.||Multi-pair cable with channeled jackets|
|US7329815||Jul 19, 2005||Feb 12, 2008||Adc Incorporated||Cable with offset filler|
|US7375284||Jun 21, 2006||May 20, 2008||Adc Telecommunications, Inc.||Multi-pair cable with varying lay length|
|US7411131||Jun 22, 2006||Aug 12, 2008||Adc Telecommunications, Inc.||Twisted pairs cable with shielding arrangement|
|US7498518||Dec 26, 2006||Mar 3, 2009||Adc Telecommunications, Inc.||Cable with offset filler|
|US7511221||Mar 31, 2005||Mar 31, 2009||Adc Incorporated||Communication wire|
|US7511225||Sep 8, 2003||Mar 31, 2009||Adc Incorporated||Communication wire|
|US7550676||May 15, 2008||Jun 23, 2009||Adc Telecommunications, Inc.||Multi-pair cable with varying lay length|
|US7560648||Jul 14, 2009||Adc Telecommunications, Inc||Communication wire|
|US7629536||Aug 10, 2007||Dec 8, 2009||Adc Telecommunications, Inc.||Multi-pair cable with channeled jackets|
|US7674981 *||Sep 25, 2008||Mar 9, 2010||Alcatel-Lucent Usa Inc.||Structured dielectric for coaxial cable|
|US7759578||May 20, 2008||Jul 20, 2010||Adc Telecommunications, Inc.||Communication wire|
|US7763805||Aug 12, 2008||Jul 27, 2010||Adc Telecommunications, Inc.||Twisted pairs cable with shielding arrangement|
|US7816606||Oct 19, 2010||Adc Telecommunications, Inc.||Telecommunication wire with low dielectric constant insulator|
|US7849928 *||Jun 13, 2008||Dec 14, 2010||Baker Hughes Incorporated||System and method for supporting power cable in downhole tubing|
|US7875800||Feb 27, 2009||Jan 25, 2011||Adc Telecommunications, Inc.||Cable with offset filler|
|US7905295 *||Sep 26, 2008||Mar 15, 2011||Baker Hughes Incorporated||Electrocoil tubing cable anchor method|
|US8022302||Jul 1, 2009||Sep 20, 2011||ADS Telecommunications, Inc.||Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same|
|US8237054||Aug 7, 2012||Adc Telecommunications, Inc.||Communication wire|
|US8375694||Feb 19, 2013||Adc Telecommunications, Inc.||Cable with offset filler|
|US8525030||Aug 31, 2011||Sep 3, 2013||Adc Telecommunications, Inc.||Communication wire|
|US8624116||Aug 31, 2011||Jan 7, 2014||Adc Telecommunications, Inc.||Communication wire|
|US8641844||Sep 19, 2011||Feb 4, 2014||Adc Telecommunications, Inc.||Telecommunications wire having a channeled dielectric insulator and methods for manufacturing the same|
|US8664531||Mar 27, 2009||Mar 4, 2014||Adc Telecommunications, Inc.||Communication wire|
|US9142335||Feb 8, 2013||Sep 22, 2015||Tyco Electronics Services Gmbh||Cable with offset filler|
|US20040055779 *||Mar 14, 2003||Mar 25, 2004||David Wiekhorst||Communication wire|
|US20040216913 *||Mar 1, 2004||Nov 4, 2004||David Wiekhorst||Communication wire|
|US20050092514 *||Dec 26, 2003||May 5, 2005||Robert Kenny||Cable utilizing varying lay length mechanisms to minimize alien crosstalk|
|US20050092515 *||Dec 26, 2003||May 5, 2005||Robert Kenny||Cable with offset filler|
|US20050167146 *||Mar 31, 2005||Aug 4, 2005||Adc Incorporated||Communication wire|
|US20050167148 *||Mar 31, 2005||Aug 4, 2005||Adc Incorporated Located||Communication wire|
|US20050167151 *||Mar 24, 2005||Aug 4, 2005||Adc Incorporated||Cable with offset filler|
|US20050205289 *||Mar 24, 2005||Sep 22, 2005||Adc Incorporated||Cable with offset filler|
|US20050247479 *||Jul 19, 2005||Nov 10, 2005||Adc Incorporated||Cable with offset filler|
|US20060032660 *||Oct 17, 2005||Feb 16, 2006||Parke Daniel J||Finned jackets for LAN cables|
|US20060180111 *||Feb 15, 2005||Aug 17, 2006||Champion Aerospace, Inc.||Air-cooled ignition lead|
|US20060274581 *||Jun 3, 2005||Dec 7, 2006||Marco Redaelli||Reference scheme for a non-volatile semiconductor memory device|
|US20070102189 *||Dec 26, 2006||May 10, 2007||Robert Kenny||Cable with offset filler|
|US20070209824 *||Mar 9, 2006||Sep 13, 2007||Spring Stutzman||Multi-pair cable with channeled jackets|
|US20070295526 *||Jun 21, 2006||Dec 27, 2007||Spring Stutzman||Multi-pair cable with varying lay length|
|US20070295527 *||Jun 22, 2006||Dec 27, 2007||Spring Stutzman||Twisted pairs cable with shielding arrangement|
|US20080066944 *||May 3, 2007||Mar 20, 2008||Adc Incorporated||Communication wire|
|US20080115959 *||Aug 10, 2007||May 22, 2008||Adc Telecommunications, Inc.||Multi-pair cable with channeled jackets|
|US20080283274 *||May 15, 2008||Nov 20, 2008||Adc Telecommunications, Inc.||Multi-pair cable with varying lay length|
|US20090025958 *||May 20, 2008||Jan 29, 2009||Adc Incorporated||Communication wire|
|US20090078439 *||Jul 11, 2008||Mar 26, 2009||David Wiekhorst||Telecommunication wire with low dielectric constant insulator|
|US20090084576 *||Aug 12, 2008||Apr 2, 2009||Adc Telecommunications, Inc.||Twisted pairs cable with shielding arrangement|
|US20090266577 *||Oct 29, 2009||Adc Incorporated||Cable with offset filler|
|US20090308618 *||Jun 13, 2008||Dec 17, 2009||Baker Hughes Incorporated||System and method for supporting power cable in downhole tubing|
|US20100000753 *||Jan 7, 2010||Adc Telecommunications, Inc.||Telecommunications Wire Having a Channeled Dielectric Insulator and Methods for Manufacturing the Same|
|US20100071929 *||Sep 25, 2008||Mar 25, 2010||Lucent Technologies Inc.||Structured dielectric for coaxial cable|
|US20100078179 *||Sep 26, 2008||Apr 1, 2010||Baker Hughes Incorporated||Electrocoil Tubing Cable Anchor Method|
|US20100078193 *||Apr 1, 2010||ADC Incorporation||Communication wire|
|US20100132977 *||Sep 18, 2009||Jun 3, 2010||Adc Telecommunications, Inc.||Communication wire|
|US20100148889 *||Apr 25, 2008||Jun 17, 2010||Peter Bohmer||High-frequency component having low dielectric losses|
|US20110209892 *||Oct 20, 2009||Sep 1, 2011||Huber+Suhner Ag||Coaxial cable|
|DE1120534B *||Aug 16, 1960||Dec 28, 1961||Norddeutsche Kabelwerke A G||Hochfrequenzkabel, bei dem als Abstandhalter Schlaeuche aus Isolierstoff dienen|