基于链路参数的屏蔽双绞线串扰预测模型

CROSSTALK PREDICTION MODEL FOR SHIELDED TWISTED PAIR BASED ON CHAIN PARAMETER

针对机载屏蔽双绞线与相邻线缆之间存在串扰的问题,提出基于链路参数的屏蔽双绞线串扰预测模型。在考虑屏蔽层转移阻抗的基础上推导出屏蔽双平行线的多导体传输线方程;将非均匀的屏蔽双绞线等效为多个扭绞级联,每个扭绞进一步简化为多段均匀传输线级联;使用级联传输线理论求得总的链路参数矩阵,进而得到单根线缆对屏蔽双绞线串扰模型。该模型求解结果与CST仿真结果对比表明,两者串扰随频率变化趋势一致,对串扰最大值的预测一致。实验结果表明,模型能有效预测串扰最大值。

Aiming at the problem of crosstalk between aircraft cables,a shielded twisted pair crosstalk prediction model based on chain parameter is proposed.The multi-conductor transmission line equation for shielding double parallel lines was derived,in which the shield transfer impedance was considered;the in-homogeneous shielded twisted pair was divided into many homogeneous shielded parallel lines.Finally,chain parameter matrix was obtained based on cascaded transmission line theory,and the shielded twisted pair crosstalk prediction model was obtained.The proposed crosstalk prediction model has been proved to be reliable by comparing with CST simulation results and experimental results.The experimental results show that the model can effectively predict the maximum crosstalk.