US3146297A - Coaxial cable with helical insulating spacer - Google Patents
Coaxial cable with helical insulating spacer Download PDFInfo
- Publication number
- US3146297A US3146297A US109469A US10946961A US3146297A US 3146297 A US3146297 A US 3146297A US 109469 A US109469 A US 109469A US 10946961 A US10946961 A US 10946961A US 3146297 A US3146297 A US 3146297A
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- United States
- Prior art keywords
- inner conductor
- turns
- conductor
- corrugation
- outer conductor
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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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- 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
Definitions
- the present invention relates to coaxial cable and more particularly to coaxial cable having a helical insulating spacer and a helical outer conductor.
- Coaxial cables for the electric conduction of high-frequency alternating currents generally consist of a metal inner conductor, insulating spacers arranged concentrically about the inner conductor, and a metal tubular outer conductor concentrically around, and supported by, the spacers.
- This type of cable should have low transmission attenuation, suificient flexibility to be curved, in placement and in transportation, without breaking the cable or lowering its transmission quality, and substantially equal transmission characteristics for equal lengths of the cable.
- the helical spacer which is preferably of a plastic material, is injection-molded directely onto the inner conductor by automatic continuous machinery.
- the helix may also be constructed by winding either a single or a plurality of tapes in helical fashion about the inner conductor.
- the outer tubular conductor may break under bending.
- a number of types of cables have outer conductors which bend satisfactorily.
- the outer conductor is a braid of metal threads, but it is inferior in transmission quality to a cable having a tubular outer conductor with solid side walls.
- Another type has a tubular outer conductor with solid side walls made of a relatively flexible metal such as lead.
- lead conducts electricity poorly especially at high frequencies, at which it is the skin or surface effect of the conductors which is of primary importance.
- the outer tubular conductor has a corrugated solid side wall, with either the corrugations arranged in a series of doughnut-shaped metal rings stacked one upon the other or in a helical form.
- the corrugations follow a symmetrical pattern, both the troughs and crests of the corrugation being curves which are symmetrical to each other.
- the helixes are laid in opposite directions to each other to provide bendability.
- the crests of the outer conductor and the crests of the spacer are positioned at random relative to each other. This random positioning results in unequal transmission characteristics for equal lengths of the cable and, as the spacer has a different dielectric constant than air, attenuation by reflection of certain high frequencies.
- Another objective is that the insulating spacer of the cable does not attenuate high frequency waves by reflection.
- Another objective is that the cable be convenient to manufacture by automatic and continuous machinery.
- a coaxial cable having an outer conductor formed with a corrugation spiralling around the inner conductor, and an insulating helix of a high dielectric material spirally wound about the inner conductor and serving as a spacer between the outer conductor and the inner conductor.
- the insulating helix is arranged so that the outer periphery of its turns is within the crest of the spiral corrugation of the outer conductor, the turns of the corrugation being separated by a valley portion of the outer conductor which spirals around the inner conductor between the turns of the insulating helix.
- the greater distance between inner and outer conductors at the crest of the corrugation of the outer conductor will electrically offset the lower insulation of the air space and the closer distance between the conductors at the directly opposite side of the cable where the valley portion of the outer conductor is located.
- FIG. 1 is a cross-sectional side View of a coaxial cable of the present invention showing the top portion of the inner conductor in half elevation;
- FIG. 2 is a cross-sectional partial side view enlarged with respect to the view of FIG. 1, showing crest and valley portions of the outer conductor and a preferred tool to form that conductor;
- FIG. 3 is a diagram of the same tool as that shown'in FIG. 2 illustrating the mathematical relationships involved in the helix of the outer conductor.
- inner conductor 9 is a cylindrical electrically conducting metal member which may be solid but is shown as hollow.
- Electrically insulating spacer 10 in the form of a helix is secured concentrically around inner conductor 9 and is surrounded by outer conductor 11, the latter being an electrically conducting tube corrugated in the form of a helix and having a solid tubular wall.
- the impedance of a coaxial cable is determined by the ratio of its inductance to its capacitance.
- the inductance is substantially the same along the length of the cable, but the capacitance varies, increasing with the insulating properties of the spacer and decreasing with the distance between conductors.
- the insulating property of a plastic helix is approximately 2.5 times that of air, i.e., the plastic material has a dielectric constant of 2.5.
- any mechanical displacements which occur due to the different coefficients of expansion of the outer conductor and the insulating helix are taken up by changes in the shape of the outer periphery of the insulating helix.
- the outer conductor and the insulating helix do not move in reiationship to one another, so that the electrical properties of the coaxial cable remain constant.
- the outer edge of the insulating helix Ill is curved prior to forming the outer conductor 11 about it, so that it conforms to the shape of the inner wall of the spiral crest of the outer conductor.
- a further advantage of this construction occurs when the coaxial cable is used in a vertical position, for example, as a feed to a high frequency antenna.
- a clamp is preferably utilized whose internal undulation profile is the same as that of the corrugation of the outer conductor. With this type of clamp, due to the construction of the cable, both the outer conductor and the insulating helix are clamped.
- the outer conductor llll is shown in greater detail in FIG. 2 in which the wall thickness of the outer conductor is designated by t.
- the wall is bent by a forming tool 12., the tool preferably being in the form of a helix.
- the wide fiat portion 2 of tool 12 together with its curved fillet 3 compresses the tubular wall of the outer conductor to form a valley i.
- Portion 6, the crest of the spiral corrugation, is not compressed by the tool but remains in recess 5 of tool 12. Since portion 6 is not under pressure, it is free to shape itself and assumes a dome having a semi-circular cross-section.
- the dimensions of the tool and of the outer conductor are preferably given by certain relationships.
- an imaginary center line 8 is drawn in the center of the wall of the outer conductor.
- the width of the recess portion of forming tool 12 is designated e
- the width 2 is less, by the thickness t of the outer conductor, than the actual width e
- the radius r of the forming tool 12, taken to the imaginary line 8 or 8a, is greater than the radius r to the outer surface of the crest.
- b is the height of the dome of the crest of the outer conductor
- R is the radius of the dome
- V is the diameter of the arched circle forming that dome
- V is the distance across the base of the dome from the ends of fillet portions 3.
- the preferred optimum relationships are that the height of the dome of the crest b is equal to its radius R. 0f greater importance for strength and bendability, however, is that the fillet radius r be substantially equal to the dome radius R, so that the metal between forming the inflection zone between the vaileys and the crest of the corrugation is not overstressed.
- the valleys 4 are preferably flat rather than curved.
- the valleys and crests preferably follow the following equations:
- the maximum bendability of the coaxial cable is generally determined by the bendability of its outer conductor.
- the inner conductor is of relatively small diameter and therefore more readily bent while the intermediate insulating spacer is usually of a plastic or other flexible material.
- the outer conductor When the outer conductor is bent to its maximum, for example, when the coaxial cable is wound upon a shipping drum, the top part of the cable (facing away from the axis of the drum) is stretched and the bottom portion is compressed.
- V designates the crest and its oppositely curving inflection zone formed by fillet 3.
- 1-V where V is less than 1, is the length of the cylindrical part (the flat valley portion) where the measurement of the uniform corrugation is set, in this specification, equal to a pitch of P.
- the pitch is the distance, along a longitudinal line, from a point at the center of one valley to a point in the center of the next valley. This distance of P will be modified by the actual measurement which will give a multiplication factor for the pitch of h.
- the crests at the top of the bent cable tend to be flattened out so that the dimension from valley to valley is lengthened.
- the relative change in length Will now be equal to:
- the bending factor is:
- V 2 cos are tan 56
- valley portion is flat in longitudinal cross-section and forms along the length of the cable a spiral wall of uniform radius with respect to the axis of the cable.
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- Waveguides (AREA)
- Communication Cables (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF30629A DE1096441B (de) | 1960-02-25 | 1960-02-25 | Konzentrisches, luftraumisoliertes Hochfrequenzkabel mit schraubenlinien-foermig gewelltem Aussenleiter und wendelfoermigem Abstandhalter aus Isoliermaterial zwischen Innen- und Aussenleiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3146297A true US3146297A (en) | 1964-08-25 |
Family
ID=7093842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US109469A Expired - Lifetime US3146297A (en) | 1960-02-25 | 1961-02-17 | Coaxial cable with helical insulating spacer |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3146297A (de) |
| DE (1) | DE1096441B (de) |
Cited By (164)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3325321A (en) * | 1963-03-01 | 1967-06-13 | Int Standard Electric Corp | Method of making coaxial electric cables |
| DE3609624A1 (de) * | 1986-03-21 | 1987-10-01 | Kernforschungsz Karlsruhe | Supraleiterkabel mit innenkuehlung |
| US20020132130A1 (en) * | 2001-03-15 | 2002-09-19 | Contech Construction Products Inc. , | Corrugated structural metal plate |
| US20100314167A1 (en) * | 2008-02-15 | 2010-12-16 | Rohde & Schwarz Gmbh & Co. Kg | Coaxial line with supporting rings |
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| DE1096441B (de) | 1961-01-05 |
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