Shield Transfer Impedance Weave

The shield transfer impedance weave algorithm is designed to compute the transfer inductance and the transfer resistance of a weave pattern type shield. A typical cable weave pattern is depicted below. For a weave pattern the transfer impedance is computed from the strand diameter, the strand conductivity, the weave angle, the number of carriers (bundles of strands), and the number of strands per carrier.

These variables are functions of the shield and are typically provided by the manufacturer. In the above equations, the imaginary part of Zd has been neglected. This is valid in the limit of small strand diameter compared to the skin depth. This dc approximation is justified by the fact that at high frequency, the inductive part, M, is dominant.