Shinobu Ishigami*, Ken Kawamata
A transient electromagnetic field caused by an electrostatic discharge (ESD) is a serious noise source for electric equipment / system especially such as digital equipment. Therefore, it is an important issue in electromagnetic compatibility (EMC). In this paper, we introduced the measurement technology of the wideband transient electromagnetic field generated by the ESD phenomenon. By converting the waveform observed by the oscilloscope into the frequency domain using the discrete Fourier transform, removing the characteristics of the measuring apparatus such as the broadband amplifier measured by the S-parameters, and applying the complex antenna factor of the antenna / sensor. These data were converted using the inverse Fourier transform, then the real waveforms of the electromagnetic field were obtained. We also introduced antenna / sensor calibration methods specialized for the far field and the near field, and examples of their characteristics. In particular, the usefulness of a broadband folded long-hexagon antenna for far-field measurement was shown.
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