Low-frequency characterization of composite panels from a near-field magnetic shielding effectiveness measurement

This paper presents a simple method allowing to obtain an homogeneous panel model from an inhomogeneous composite panel thanks to a near-field magnetic shielding effectiveness (MSE) measurement in the low frequency range (f <; 1 MHz). The method, which does not require the knowledge of the detailed internal geometry of the panel, consists in determining the “equivalent conductivity” of the homogeneous model. After the validation of the measurement setup on a copper plate of known conductivity, homogenization of 3 different samples is presented. Finally, homogenization of samples made of different inhomogeneous layers previously characterized separately is presented and validated.