Distance characteristic of electric field waveform and field peak value caused by micro gap ESD in a pair of spherical electrodes

Abstract

It is well known that wideband electromagnetic noise is caused by ESD (electro-static discharge) events. Especially, the micro gap ESD of less than 1 kV produces the impulsive electromagnetic noise up to GHz bandwidth. The ESD noise is menace to cause malfunction of high-tech electrical equipment and systems. Then, the impulsive electromagnetic noise caused by the ESD was examined to clear the radiation mechanism. In this report, the electric field waveform was measured using an optical electric field sensor system and the spherical electrode system. As a result, we concluded that the electric field wave form was transformed from the static electric field to the induction field and the radiation field be caused by increasing a distance between the electrode and the electric field sensor. It is provided that the mechanism of electromagnetic radiation caused by ESD in the pair of spherical electrode can be considered as the dipole radiation model with the electrode elements.