Research on Shielding Effectiveness Evaluation Method of Materials with Fine Complex Structure

New materials with fine and complex structures are widely used in multifunctional materials. Aiming at the difficulty of mesh generation and electromagnetic simulation of shielding effectiveness of the electromagnetic model used the materials with fine and complex structures, according to the distribution of electric field and magnetic field on the surface of the material structure unit, the equivalent electromagnetic parameters are deduced and the equivalent simulation model is established. The equivalent material model is established, the equivalent model and the real structure model of infinite plate are simulated. The simulation results of shielding effectiveness differ 0.1 dB, the results are in good agreement with each other. This equivalent simulation method can be used to evaluate the shielding effectiveness of materials with fine complex structure and realize the equivalent simulation of large irregular electromagnetic model.