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Electromagnetic shielding is of high importance to avoid coupling between cables or pick-up of external fields. The use of metal braids around cables improves its protection. Shielding effectiveness of these braids is characterized by the transfer impedance of infinitesimally short braids. In practice, the transfer impedance is measured along a braid of finite length by either a line injection or...
A closed-form expression for near-end crosstalk between an unshielded and a double shielded wire is derived. Analysis in the frequency domain of such crosstalk expressions leads to generic crosstalk predictions. These predictions contain regions of different frequency dependencies separated by transition frequencies.
Low-frequency analysis on multi-conductor transmission line equations results in closed-form leading order expressions for near-end crosstalk. Two wiring configurations are introduced for which leading order dependency on all model parameters can be derived. An interesting result is a 24 dB/octave decrease of crosstalk when distance is increased between two wire pairs, oriented parallel to an infinite,...
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