An investigation of electromagnetic interference shielding effectiveness with multilayer thin films material

Abstract

This study prepared a thin films composite material sputtered with multi-layer good conductors on the surface of lightweight condensation polymer, which can be applied to electromagnetic interference shielding materials in the range of 1–6 GHz. Sub-micrometer grade silver (Ag), nickel (Ni), titanium (Ti), and graphite films were sputtered on a nylon (PA12) substrate by physical vapor deposition. The shielding effectiveness of the multilayer thin films composite was measured in accordance with a standard procedure, and the shielding index of the multilayer thin films composite was calculated. Three different electromagnetic interference shielding structures were tested in this study and gave statistically similar results with electromagnetic interference shielding effectiveness varying from 58 dB to 35 dB. The prediction results of a composite mathematical simulator were developed, including the theoretical formula model and the comprehensive prediction results of the multiple regression model, which are conducive to the development and evaluation of related composite materials in the future.