Advanced Materials for Electromagnetic Shielding
by Maciej Jaroszewski, Sabu Thomas, Ajay V. Rane
1 EMI Shielding Fundamentals
M. K. Aswathi1, Ajay V. Rane1,2, A. R. Ajitha1, Sabu Thomas1,3, and Maciej Jaroszewski4
1 International and Inter University Centre for Nanoscience and Nanotechnology, Mahatma Gandhi University, Kottayam, Kerala, India
2 Composite Research Group, Department of Mechanical Engineering, Durban University of Technology, Durban, South Africa
3 School of Chemical Sciences, Mahatma Gandhi University, Kottayam, Kerala, India
4 Faculty of Electrical Engineering, Wrocław University of Science and Technology, Wrocław, Poland
1.1 Fundamentals of EMI Shielding Theory
Electromagnetic shielding is process of reducing the dispersion of electromagnetic waves into a desired space by hindering the waves with a shield made of conductive material. The effective performance of electrical instruments or the working of electrical instruments is interrupted, degraded, obstructed, or limited due to the electromagnetic interference (EMI). In a material the main mechanisms for EMI attenuation are reflection, absorption, and multiple reflection [1, 2]. Reflection is the primary mechanism of EMI shielding. For reflection the material must possess mobile charge carriers such as electrons or holes that interact with the electromagnetic radiation. Metals are the most common material for EMI shielding and the available free electrons in metals interact with the electromagnetic waves [3]. If the material is highly conductive the shielding against EM (electromagnetic) waves will ...