Andrew Corporation

Vijay K Chopra

Hugh Robert Nudd

James A Krabec

Sitaram Rampalli

Robert D Perelman

Frank R Willis

An RF coaxial cable with clad conductors includes an inner tubular conductor having a first base layer formed of a relatively higher conductivity material, and a first bulk layer formed of a relatively lower conductivity material. The first base layer of higher conductivity material extends over an area greater than an area of the first bulk layer to form first margin regions composed of only the higher conductivity material. The first margin regions of the first base layer of the higher conductivity material are joined together to form the inner tubular conductor with only the first margin regions of the higher conductivity material being joined. Also included is a dielectric material surrounding the inner conductor, an outer tubular conductor formed in the same manner as the inner conductor. The first base layer of higher conductivity material of the inner tubular conductor faces outwardly toward the dielectric material and the higher conductivity material corresponding to the outer tubular conductor faces inwardly toward the dielectric material.

RF cable having clad conductors and method of making same

A corrugated coaxial cable including a core with at least one inner conductor and a highly expanded polymeric foam dielectric surrounding the inner conductor. This coaxial cable has a corrugated outer conductor closely encapsulating the foam dielectric. The corrugated coax cable is dimensioned to provide the cable with a velocity of propagation of greater than 90% of the speed of light.

Corrugated coaxial cable with high velocity of propagation

A fluid detection system includes a cable which is capable of being dried easily after coming into contact with the fluid being detected and displays a measurable change in characteristic impedance immediately upon contact with the fluid. The cable comprises an inner conductor and a cylindrical outer conductor disposed in a substantially parallel and coaxial relationship with each other with a dielectric detection layer coaxially disposed between the inner and outer conductors. The outer conductor is of an open braided construction which permits easy passage therethrough of the fluid to be detected. The detection layer comprises a pair of solid dielectric elements stranded around the inner conductor in a double helical configuration and defining an air gap between the two conductors which is adapted to retain the fluid so as to measurably change the characteristic impedance of the cable. A coating of dielectric material is provided around the solid inner conductor, the thickness of which can be controlled to adjust the change in characteristic impedance resulting from the presence of fluid within the dielectric layer. The improved cable construction allows the dielectric layer to be dried quickly even after the cable has been immersed in the fluid so that successive fluid detection measurements may be made without delay.

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Palos Park, IL, United States of America

Vijay K Chopra