PCB Near-Field Transient Emission Time-Domain Model

Abstract

This study is aimed at the time-domain (TD) electromagnetic compatibility (EMC) modeling of a planar near-field (NF) emission. The radiated EMC model is built, consisting of elementary dipole array, capable of accurate reproduction of NFs emitted by electronic circuits with transient excitations of nanoseconds duration. The details of the modeling approach are explained. The determination method of dipole parameters from the given time-dependent scanned 3-D electromagnetic (EM) field is developed. The proposed TD model was validated first with ideal sources excited by electrostatic discharge standard surge currents. Then, it was validated with the experimental scanned magnetic NF radiated by a microstrip circuit excited by a pulse RF signal. The magnetic field predictions confirmed the modeling procedure correctness. Modeling errors in reproducing the scanned transient 3-D EM field were better than 0.1%. Errors in NF to NF transformation of the transient EM field were in the range of 2%. The suggested model is particularly useful for the EMC NF emission investigation of modern multifunctional electronic systems with a mixture of analogue and digital blocks generating transient and impulse disturbances.