An optimization method for conformal shielding

Abstract

Conformal shielding, as an efficient method for solving the electromagnetic interference (EMI) problem, is becoming increasingly important. In this Letter, the Taguchi method in quality engineering was introduced into the design optimization of conformal shielding. As a pilot test, the authors studied the order of the effects of shielding layer material, shielding layer thickness, and distance between ground vias (D-via) on shielding effectiveness (SE). The comparison between simulated results and predicted results proves that the optimization method is accurate and effective. The thin-film conductivity of copper was measured, and the model was revised using the measurement results. For validation, built a near-field scanning platform, and measured shielding effectiveness and simulated shielding effectiveness show a good agreement from 0.1 to 7.5 GHz.