Calculation of crosstalks in multiple-conductor cables
The rigorous method of calculations of characteristics of two-wire lines (twisted pairs) inside the metal armor and of a mutual coupling between lines is considered. It is shown that the mutual coupling between lines in multiple-conductor cables results in appearance of electromagnetic interferences (crosstalks) in communication channels. The voltages values (interferences) across the impedances placed at the beginning and the end of the adjacent line at the given power in the main line are determined.
A Prediction Method of Cable Crosstalk in Electronic Systems with Ensemble Learning
Crosstalk between cables can seriously impede the performance of electronic systems. Cable layouts are becoming increasingly complex, and crosstalk is influenced by many factors, so it is difficult for existing crosstalk prediction methods to accurately establish direct relationships between cable near-end crosstalk and its numerous influencing factors. In order to identify the electromagnetic compatibility (EMC) problems of electronic systems in the early stage of cable layout design to guide the optimization of cable layout, the stacking-LSRM multi-stage ensemble learning method was proposed. Using this method, a cable crosstalk prediction model with high prediction accuracy and good robustness can be quickly established programmatically. Two examples were used to verify the effectiveness of the proposed method. In each example, the overall performance of the obtained optimal ensemble learning prediction model was quite good, and the effectiveness of the proposed method was verified by comparison with the prediction models established by existing methods.
A theoretical analysis of the propagation properties of the twisted-wire pair running above a ground plane
Electromagnetic coupling between neighboring circuits can be mitigated using twisted-wire pairs (TWP). However, the presence of twisting provokes an alteration of the wave propagation parameters of the wire pair itself. The periodicity arising from conductor twisting gives rise to frequency-domain standing-wave effects that may dramatically alter the system propagation properties as compared to those concerned with the untwisted case. This paper deals with the analysis of the propagation properties of a three-conductor nonuniform transmission-line system comprising a TWP running above a conducting plane. In particular, we show that important stop bands with anomalous dispersion characteristics occur for frequencies such that the twist period gets close to one half wavelength. A simplified abrupt-twist model for the TWP, together with an averaging technique, is used in order to derive closed-form analytical results for the wave propagation parameters of the three-conductor system. This model, despite its simplicity, conveys the key ideas necessary for a good understanding of the propagation properties of the helical-type TWP configuration.