Magnetic sheets come in metal powder-, ferrite-, polymer- and metallized-based materials with each supplier’s material being unique. which frequencies need to be attenuated or which frequencies need to have to the lowest losses? Each application may have a different set of key parameters, e.g. But without a deep background in material science or vast experience, choosing the right material can become a challenge. Many suppliers have various materials documented by differing datasheets and data curves. Those thin, flexible magnetic sheets are utilized in a variety of applications: to suppress unwanted EMI signals (for both radiated and susceptibility) for magnetic-field (H) shaping and directionality in NFC and RFID applications to provide shielding and coil optimization in both magnetic induction and magnetic resonance wireless power applications to lessen eddy-current losses of other resonance applications to being used as an ESD protection device and more. You may have physically touched them, and/or maybe actually used them, but do we really know how they work or if the best material was used? Maybe they have been seen laying around the laboratory, typically black or gray in color, but sometimes they’re exotic and silver-looking and appear to have come off the mysterious aircraft that crashed in Roswell, New Mexico in 1947. You may have heard of “EMI suppression” or “RF antenna” sheets, which are thin, flexible magnetic shields. This article is part of the TechXchange: Delving into EMI, EMC and Noise
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