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<p>As the demand for high-speed in-vehicle communication for ADAS and autonomous driving grows, ensuring the signal integrity of 1Gbps Automotive Ethernet cables that comply with IEEE 802.3&#xa0;bp and OPEN Alliance (OA) TC9 standards is critical. While simulations often predict successful performance, a significant gap frequently emerges between theoretical models and manufactured products, particularly concerning mode conversion loss, a key indicator of electromagnetic compatibility (EMC). This study investigates the root cause of this discrepancy, specifically the degradation of Longitudinal Conversion Loss (LCL) and Longitudinal Conversion Transfer Loss (LCTL) in physical cables. We establish a direct, quantitative relationship between a specific manufacturing process variable—twist pitch variation—and the resulting mode conversion loss. Through a comparative analysis of simulation data and empirical measurements from a manufactured Unshielded Twisted Pair (UTP) cable, coupled with non-destructive X-ray analysis, we demonstrate that controlling physical asymmetry is paramount. Our key finding reveals that to satisfy the stringent LCL/LCTL requirements of the OA TC9 standard, the twist pitch variation must be maintained within a precise tolerance of ± 5.64%. This provides a concrete, actionable manufacturing guideline, bridging the gap between design theory and mass production and offering a critical contribution to the reliable deployment of high-speed automotive communication systems.</p>

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Impact of Manufacturing-Induced Twist Pitch Variation on Mode Conversion Loss in 1Gbps Automotive Ethernet UTP Cables

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Joo-Ho Lee,
  • Yong-Ki Cho,
  • Young-Chul Jin,
  • Su-Yong Kim,
  • Ic-Pyo Hong

摘要

As the demand for high-speed in-vehicle communication for ADAS and autonomous driving grows, ensuring the signal integrity of 1Gbps Automotive Ethernet cables that comply with IEEE 802.3 bp and OPEN Alliance (OA) TC9 standards is critical. While simulations often predict successful performance, a significant gap frequently emerges between theoretical models and manufactured products, particularly concerning mode conversion loss, a key indicator of electromagnetic compatibility (EMC). This study investigates the root cause of this discrepancy, specifically the degradation of Longitudinal Conversion Loss (LCL) and Longitudinal Conversion Transfer Loss (LCTL) in physical cables. We establish a direct, quantitative relationship between a specific manufacturing process variable—twist pitch variation—and the resulting mode conversion loss. Through a comparative analysis of simulation data and empirical measurements from a manufactured Unshielded Twisted Pair (UTP) cable, coupled with non-destructive X-ray analysis, we demonstrate that controlling physical asymmetry is paramount. Our key finding reveals that to satisfy the stringent LCL/LCTL requirements of the OA TC9 standard, the twist pitch variation must be maintained within a precise tolerance of ± 5.64%. This provides a concrete, actionable manufacturing guideline, bridging the gap between design theory and mass production and offering a critical contribution to the reliable deployment of high-speed automotive communication systems.