THE DESIGN OF MULTIWIRE SCREENS

Cables employing braiding and two-layer binder screens, are the most commonly employed industrially-manufactured flexible cables (for radio, maritime and other cable products). This is due to the fact that mesh screens combine electrical and mechanical properties in the best way. However, difficulties are encountered in a theoretical determination of the screening characteristics of braiding: It is impossible to obtain a rigorous closed solution, there are contacts between conductor intersections both within the same lay and between lays in different directions whose resistance has an arbitrary distribution, and there is the problem of the complexity of the field structure near the surface of the braiding associated with the helical overlapping of the screen conductors. By applying the method of averaging in [1] to inhomogeneous screening, it is possible to avoid these difficulties. A method is described that makes it possible to calculate the screening attenuation of cable braiding and binder.