1. Introduction
Electromagnetic interference (EMI) shielding refers to the re-flection and/or adsorption of electromagnetic radiation by a ma¬terial, which thereby acts as a shield against the penetration of the radiation through the shield. As electromagnetic radiation, particularly that at high frequencies (e.g., radio waves, such as those emanating from cellular phones), tends to interfere with electronics (e.g., computers), EMI shielding of both electronics and the radiation source is needed and is increasingly required by governments around the world. The importance of EMI shielding relates to the high demand of today’s society on the re¬liability of electronics and the rapid growth of radio frequency radiation sources.11-91
The EMI shielding is to be distinguished from magnetic shield¬ing, which refers to the shielding of magnetic fields at low fre¬quencies (e.g., 60 Hz). Materials for EMI shielding are different from those for magnetic fielding.