Analysis of the Influence of the Structural Parameters of Aircraft Braided-Shield Cable on Shielding Effectiveness

As the more-electric aircraft concept is accepted as the key feature of the next-generation civil aircraft, the onboard electromagnetic environment is getting much worse than traditional models, and consequently the interconnecting cables as the major coupling path of the electromagnetic interference (EMI) are required to provide more sufficient EMI protection ability. Shielded cables have been considered as reliable carriers and widely used in the aircraft for years, but any differences in shielding structure or the number of shielding layers may lead to a significant change in shielding performance. Based on the transmission line theory, this paper builds the crosstalk prediction model for two different shielded cables first, and compare the calculated crosstalk with simulation result to verify the reliability and the effectiveness of the prediction model. Furthermore, the impact of the structural parameters of the cable shield on the shielding performance is studied, such as the number of shielding layer, the thickness of the shielding layer and insulating layer.