多芯电缆屏蔽效能的仿真计算与测试

Simulation and testing of the shielding effectiveness of multicore cables

本文首先论述了由多导体传输线理论对多芯电缆屏蔽效能进行仿真计算,根据多芯电缆和同轴电缆的区别与联系,对各种电缆屏蔽效能的测试方法进行分析比较,提出了一种改进的测试多芯屏蔽电缆的转移阻抗,进而求出其屏蔽效能的注入线测试方法,并且比较了仿真计算结果和测试结果,达到很好的一致性。

This paper presents first a simulation program for calculating the shielding effectiveness of multicore cables based on the theory of multi-conductor transmission line. Then comparison was made among the testing methods of the shielding effectiveness considering the difference and relationship between the coaxial cable and multicore cable. An improved line injection method is presented in which the transfer impedance of the shielded multicore cable is measured first from which the shielding effectiveness is derived. The testing result shows good consistency with that of the simulation.