Analysis of Shielding Effectiveness in the Electric Field and Magnetic Field and Plane Wave for Infinite Sheet Metals

摘要

Electromagnetic interference shielding means to use a shield (a shaped conducting material) to partially or completely envelop an electronic circuit. In the Aerospace industry, electromagnetic shielding plays an intricate part in the design process of any space vehicle. Electromagnetic fields from various devices may have tremendous effect on each other if proper shielding protection is not appropriately implemented. As industry standard, electromagnetic shielding is called shielding effectiveness. From Maxwell’s equations electromagnetic theory, the objectives of the shielding effectiveness calculations were to determine whether or not the selected tapes would conform to the 40 dB shielding effectiveness requirement as indicated in EMC specifications for electric field, magnetic field and planewaves from the system generated electromagnetic pulse, By using mathwork’s MATLAB the absorption loss, reflection loss, re-reflection correction factor, and the shielding effectiveness were computed for three different types of sheet metals.