Distance Properties of Transient Magnetic Field Strength Caused by ESD in a Pair of Spherical Electrodes

Abstract

An ESD (electrostatic discharge) event generates impulsive electromagnetic fields and causes a source of wide-band electromagnetic noise. To discuss the EM radiation mechanism due to ESD, transient magnetic fields were measured to consider the distance characteristics of peak value of the fields. It was confirmed that the transient magnetic field attenuated by the inverse square of distance in a nearby spark gap, while in inverse proportion to the distance in the far distance. This result is considered to suggest that the EM radiation model due to ESD is explained by the dipole antenna model which has a metallic radiating structure of the spherical electrodes.