In this study, we derived a theoretical equation for the shielding effectiveness (SE) of planar lossy materials against obliquely incident plane waves and analyzed the shielding characteristics of dielectric and magnetic absorbing (lossy) materials. The SE equation was obtained by decomposing the obliquely incident plane wave into perpendicular and parallel polarizations, and the SEs for various incident angles were analyzed using Schelkunoff's decomposition method, which considers reflection, absorption, and multiple reflections. The trends observed in our analysis were validated through 3D numerical simulations.
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Nam et al. (2024) studied this question.
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