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CA1079504A Expired / Lapsed CA ⏱️ 0.0 years remaining

Method of producing coaxial cable

Assignee: General Dynamics Canada Ltd
•
Filing: 1978-10-13
•
Granted: 1980-06-17
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Expires: 1998-10-13
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Abstract

Abstract ABSTRACT A method of manufacturing leaky coaxial cables having an array of apertures in the conductive outer layer. The total area of the apertures is a predetermined fraction of the surface area of the cable. A pair of strip conductors of particular widths are selected and wound around the inner conductor and dielectric at predetermined pitch angles. This provides apertures having a total area which is a predetermined fraction of the surface area of the cable, a predetermined shape and being of a predetermined number per unit length. By varying the pitch angle during winding the distribution of apertures and hence the coupling of the cable can be varied. By testing short sections of cables of different geometry a coupling function and an attenuation function can be calculated to provide data for winding cables with desired characteristics.

Inventors

  • 👤 Robert K. Harman
  • 👤 Melvin C. Maki

Bibliographic Details

Application Number —
Jurisdiction CA
Data Source google_patents
Last Synchronized 2026-10-29 14:23
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/203

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 70 words
A method of manufacturing a leaky coaxial cable comprising the steps of: providing a core having an inner conductor surrounded by a dielectric layer, winding at least two conductive tapes therearound, the tape widths and pitch angles being selected to provide apertures having a total area which is a predetermined fraction of the surface area of the cable, a predetermined shape and being of a predetermined number per defined length.
Claim 2
Independent Claim 70 words
A method of manufacturing a leaky coaxial cable comprising the steps of: providing a core having an inner conductor surrounded by a dielectric layer, winding at least two conductive tapes therearound, the tape widths and pitch angles being selected to provide apertures having a total area which is a predetermined fraction of the surface area of the cable, a predetermined shape and being of a predetermined number per defined length.
Claim 3
Dependent Claim 38 words
A method as set out in claim 1 including the further step of varying the pitch angle of at least one of the conductive tapes to vary the number of apertures per unit length and said predetermined fraction.
Claim 4
Dependent Claim 90 words
A method as set out in claim 1 including the steps of constructing short lengths of cables of varying geometry, testing the coupling and attenuation of said short lengths to determine a coupling unction C and an attenuation function a where: C = f (.THETA.1, .THETA.2, w1, w2, c) .alpha. = g (.THETA.1, .THETA.2, w1, w2, c) where .THETA.1 and .THETA.2 are tape pitch angles w1 and w2 are tape widths c is the cable circumference and determining the tape width and pitch angles to give the desired cable characteristics.
Claim 5
Dependent Claim 18 words
A method as set out in claim 3, wherein the pitch angles are varied along the cable length.
Claim 6
Dependent Claim 33 words
A method as set out in claim 4 9 wherein the pitch angles are equal and of value .THETA. and vary in accordance with the relationship: where x is distance along the cable.

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