屏蔽电缆转移阻抗的三同轴测试方法研究

Research on Triaxial Method of Transfer Impedance of Shielded Cable

利用AS(ALBERT R.MARTIN and STEVEN E.EMERT)模型推导出阻抗匹配程度对三同轴法测试屏蔽电缆转移阻抗结果的影响。对同一屏蔽电缆在满足不同的阻抗匹配条件时的转移阻抗进行了测试,并对测试结果进行了对比分析。结果表明:阻抗匹配程度的优劣对测试结果的影响不可忽略,实际的测试过程中这种影响是交叉存在的。此外,在三同轴法中双短路法相比电阻馈电法在阻抗匹配条件上更容易实现,实际的测试结果也会更加准确。

The effect of impedance matching on the transfer impedance of shielded cable measured by triaxial method is derived based on the(ALBERT R.MARTIN and STEVEN E.EMERT)model.The transfer impedance of the same shield cable is measured under different impedance matching conditions,and the test results are compared and analyzed.The results show that the quality of impedance matching have an unneglected effect on the measurement of transfer impedance,and this kind of effect is cross-existing during the actual measurement.Besides,in triaxial method,the short-short circuit method is easier to achieve than the resistance feed method in impedance matching conditions,which means that the actual measurement will be more accurate.