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US 4,287,384 AGranted
Phase stabilization type coaxial cable
AssigneeSumitomo Electric Industries, Ltd.
InventorYasunori Saito
Life of this patent
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Abstract
An air dielectric coaxial cable in which variations in phase characteristics due to variations in ambient temperature are minimized. An insulator is formed by welding a spiral rib which is in contact along one edge thereof with the outer wall of the inner conductor to an outer pipe of the same material. The outer conductor is provided in close contact with the outer wall of the insulating pipe. The space factor of the insulator is set between predetermined limits in accordance with a disclosed technique.
Claims4
An air dielectric coaxial cable comprising:
- an inner conductor, and outer conductor, and an insulator disposed between said inner and outer conductors in which the space factor R of said insulator is such that:
- Rmin<R<Rmax, where:
- ##EQU9## where:
- S.sub.1 :
- the cross-sectional area of said inner conductor,
- S.sub.2 :
- the cross-sectional area of said outer conductor,
- E.sub.1 :
- the Young's modulus of a material forming said inner conductor,
- E.sub.2 :
- the Young's modulus of a material forming said outer conductor,
- .alpha..sub. :
- the coefficient of linear expansion of the insulator material,
- .alpha..sub.1 :
- the coefficient of linear expansion of said material forming said inner conductor,
- .alpha..sub.2 :
- the coefficient of linear expansion of said material forming said outer conductor,
- d.sub.1 :
- the outside diameter of said inner conductor,
- d.sub.2 :
- the inside diameter of said outer conductor,
- .epsilon..sub.0 :
- the dielectric constant of said insulator,
- and T:
- the ambient temperature.
22 more elements
Dependencies are inferred from the claim text.