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Necessity of Charge Measurement for Radiation Evaluation of Transmission Lines

机译：传输线辐射评估中电荷测量的必要性

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摘要

This paper attempts to arouse people's attention to charge measurement in electromagnetic compatibility, especially when evaluating the radiation of transmission lines (TLs). Usually the total current (or common-mode current) is supposed to represent the potential radiation of a TL system. However, it is proved that the measurement of charge, which is the dual source quantity of current, is also necessary to evaluate radiation in this paper. Only when the current and charge are both obtained, the radiation field could be determined accurately. First of all, it is pointed out that charge information could not be properly obtained by current measurement. Although charge could be derived from current theoretically, the error transferred from current to charge could be great for measurement. Then, the error transferred from current to near field (which reflects the charge distribution) is studied by simulation of a typical TL case. And it is proved that such error could be reduced effectively if current is modified by charge. In addition, another important reason for charge measurement is given as limited measurement points, since the standing waveform on TLs cannot be determined by current only. Finally, a possible method for charge measurement is proposed.
机译：本文试图引起人们对电磁兼容性中电荷测量的关注，尤其是在评估传输线（TL）的辐射时。通常，总电流（或共模电流）应该表示TL系统的潜在辐射。然而，事实证明，在本文中，作为电流的双源量的电荷测量也是评估辐射的必要条件。只有同时获得电流和电荷，才能准确确定辐射场。首先，指出通过电流测量不能正确获得电荷信息。尽管理论上可以从电流得出电荷，但从电流到电荷的误差对于测量来说可能很大。然后，通过模拟典型的TL情况，研究了从电流转移到近场的误差（反映了电荷分布）。事实证明，通过充电改变电流可以有效地减小这种误差。此外，电荷测量的另一个重要原因是有限的测量点，因为TL上的驻波不能仅由电流确定。最后，提出了一种可能的电荷测量方法。

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