Electric Fields Radiated from the Gap Between Two Screws Discharged with an Electrostatic Discharge Gun

Abstract

The finite difference time domain method was used to study the electric fields radiated from the gap between two screws embedded in an acrylic bar discharged with an electrostatic discharge gun. The excited source voltage across the gap between two screws was expressed by double exponential forms with two different decay constants after curve fitting 500 sets of measured data using classical curve-fitting techniques together with Newton's iteration method. The excitation source voltage pulse was then transferred into an electric field pulse over the gap between the two screws. The calculated electric fields radiated from the gap between the two screws were compared with those obtained from measured data at frequencies of 80 MHz to 1.0 GHz. It is shown that the measurement data manifests a good agreement with the simulation results. It is also found that the radiated electric field decreases sharply as the frequency increases from 80 MHz to 1.0 GHz. The time domain behavior of the radiated electric field near the acrylic bar was also obtained by the finite difference time domain method for observation of pulsed electromagnetic interference immunity.