Electromagnetic Shielding Analysis of Multiply Bent Slots Using Generalized Scattering Matrices

Analytic formulations based on the Fourier transforms and the generalized scattering matrices are derived to analyze the shielding performances of multiply bent slot geometries, which model joints or seams frequently used in electronic systems. The formulation can accommodate arbitrarily bent structures by decomposing into cascades of simple slots with different widths and lengths. Fourier transforms are used to air-to-slot interface modeling and scattering matrices are used for arbitrarily bent slots. The formulations are numerically efficient and capable of predicting accurately shielding or penetration phenomena of multiply bent slots loaded with lossless or lossy materials. Calculations show that addition of bends in the slot loaded with lossy material has strong positive effect on shielding effectiveness. The results of this study provide guidelines for improved bent slot designs against electromagnetic interference.