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US 4,760,362 AGranted
Leaky coaxial cable providing inductive coupling by eliminating radiating gaps, and the method of making same
AssigneeControl Data Canada, Ltd.
InventorMelvin C. Maki
Life of this patent
Estimating the term…
Abstract
A leaky coaxial cable is designed to produce a defined coupling between its interior and exterior. A bonded and insulated outer conductor of relatively large width relative to the cable diameter, is spirally wound at a low pitch angle to provide at high frequencies a coupling level having minimal effect on the coaxial properties of the cable.
Claims12
A leaky coaxial cable having inductive coupling, comprising:
- a central conductor extending along a longitudinal axis;
- a dielectric layer disposed coaxially around the central conductor;
- and
- an outer coaxial conducting shield, the shield comprising a tape of selected width having a continuous, imperforate conductive layer and an insulating layer, said tape being arranged in a spiral configuration to provide inductive coupling, with abutting edges of the conductive layer in the spiral configuration overlapping so as to substantially eliminate radiating gaps and being insulated from one another by said insulating layer, the pitch angle of the tape with respect to the longitudinal axis of the cable being less than 30.degree..
1 more element
A leaky coaxial cable having:
- a central conductor extending along a longitudinal axis;
- a dielectric layer disposed coaxially around the central conductor;
- and
- an outer coaxial conducting shield, the shield comprising a tape of selected width having a continuous imperforate conductive layer and an insulating layer, said tape being arranged in a spiral configuration to provide inductive coupling, the abutting edges of the conductive layer in the spiral configuration being sufficiently closely spaced to substantially eliminate radiating gaps therebetween, thereby preventing radiation between adjacent edges, said abutting edges being insulated from one another, the pitch angle of the tape with respect to the longitudinal axis of the cable being less than 30.degree. to provide an acceptable level of inductive coupling with minimum capacitive coupling.
1 more element
A method of constructing a leaky coaxial cable comprising the steps of:
- (a) providing a core consisting of a central conductor and a dielectric layer disposed coaxially thereon;
- (b) providing a laminated tape of selected width and having a conductive layer and an insulating layer, the ratio of the tape width to the circumference of said coaxial cable being selected to produce a low level of capacitive coupling in the assembled cable;
- (c) winding the tape coaxially around said core at a predetermined pitch angle below 30.degree., with adjacent edges being sufficiently closely spaced to substantially eliminate radiating gaps therebetween, said edges being insulated from one another, so as to provide an acceptable level of inductive coupling;
- and
- (d) said winding of the tape being with sufficient surface coverage to provide a low level of capacitive coupling.
2 more elements
Dependencies are inferred from the claim text.