外场激励时通信电缆的瞬态响应分析

Transient Analysis of Telecommunication Cable Excited by External Field

多导体传输线理论分析外场与电缆间的耦合,时域有限差分法(FDTD)模拟通信电缆对外场的时域响应.根据模拟得到的电缆上电压电流的分布,对具有多根导线电缆采用单导线模型做近似处理,并计算了相应的电参数.结果表明,单导线模型处理所得结果和其他方法的结果符合得很好.该结论对实际应用有参考价值.

The multi-conductor transmission line （MTL） theory was used in the analysis of the coupling between telecommunication cable and external field, the finite-difference time domain （FDTD） method was used to simulate the transient response. According to the results of induced voltages and currents, an approximate single-wire line model replaced the multi-conductor transmission line model and the corresponding electric parameters were calculated in term of the single-wire line model. The result indicates that agreement had been achieved with other method. The effects on induced voltages with simplified single-wire line caused by cable length, electric parameters of the ground and terminated impedance are examined and the results are discussed.