双绞线回波损耗

J. Poltz, M. Josefsson, J. Beckett
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引用次数: 0

摘要

讨论了双绞线电缆(TPC)的建模和回波损耗(RL)的模拟,并进行了实验验证。图形用户界面允许输入电缆设计数据,包括材料,电镀,绞合,扭转和电线命名。计算了真实的双绞线电缆三维模型。然后采用有限元和边界元相结合的方法对所得模型进行数值分析。利用提取的与频率相关的电缆单元参数建立链参数模型。讨论了链参数分割的条件。用50米长的四TPC对RL测量结果进行了验证。测量用矢量网络分析仪进行。电缆的两端都连接到特殊的固定装置上,这种装置是为了消除反射而设计的。仿真和测量在100khz到1ghz的频率范围内绘制。仿真结果与实测结果吻合较好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Return loss in twisted pair cables
Modeling of twisted pair cable (TPC) and simulating return loss (RL) is discussed and verified experimentally. A graphical user interface allows entering cable design data including materials, plating, stranding, twisting, and wire naming. A realistic 3D model of a twisted pair cable is calculated. The resulting model is subsequently analyzed numerically using a combination of finite element and boundary element methods. Extracted, frequency dependent unit parameters of the cable are used to build a chain parameter model. Conditions for chain parameter segmentation are discussed. A 50 meter long four TPC was used to verify simulation results against RL measurement. The measurements were carried out with a vector network analyzer. Both ends of the cable were connected to special fixtures, which were designed to eliminate reflections. Simulation and measurement are plotted in the frequency range of 100 kHz to 1 GHz. Good agreement between simulation and measurement of RL is reported.
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