Regulate drain‐shield relative positioning and contact for mitigating radiated emission from USB cables

• DOI: 10.1049/ell2.13176
• Publication Date: 2024-04-12T09:41:25Z
• Authors: Tao Liang; Ziqian Yin; Yu Song; Zhihao Xi; Yan‐zhao Xie
• Keywords: radiated emission; drain wire; shielding; telecommunication cables; 0202 electrical engineering, electronic engineering, information engineering; Electrical engineering. Electronics. Nuclear engineering; 02 engineering and technology; electromagnetic compatibility; TK1-9971

AbstractThis letter delves into the influence of drain wire design on electromagnetic radiated emission (RE) from a commercial universal serial bus (USB) cable operating in a high‐speed data transfer mode. The investigation involves an experimental comparison of measured RE across various retrofitted cables. Notably, it is demonstrated that the distribution of contact points on the drain‐shield has negligible effects on RE. Conversely, relocating the drain wire externally to the shields and minimizing the distance with respect to the grounding connector leads to a significant reduction in RE, particularly within the sub‐MHz frequency range. Consequently, regulatory proposals are put forth to diminish overall RE and enhance the RE compliance of USB cables.