THE DESIGN OF PLATED COAXIAL CABLE,
UNITED-CARR INC CAMBRIDGE MASS EXPLORATORY DEVELOPMENT LAB
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A theoretical model of the strain produced in a plated coaxial cable upon bending over a mandrel of given radius was developed. This theory was used to evaluate the importance of various parameters such as groove depth, groove pitch, and wall angle on the strain produced in the metal film. The groove depth was found to be of most importance. The remaining parameters can be chosen for manufacturing convenience. The electrical properties of the cable can be predicted by considering the cable as an eccentric coaxial transmission line and using the appropriate equations for characteristic impedance and attenuation. The fact that the eccentricity spirals about the center conductor seems to have no effect on the accuracy for frequencies up to 12 GHz. The validity of the theory was checked by flexing to destruction a number of cable samples with different groove depths. The data for all of these samples were found to plot on a single curve. This curve is used to compute the flex life of new cable designs. A computer program has been developed which includes all of these factors.
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