Ferrite sheets provide the benefits of traditional soft-magnetic materials whilst providing far more flexibility and versatility, freeing you from the typical mechanical constraints of Ferrite cores. Typically well suited for RFID and EMC protection due to its flexible nature and minimal material thickness (typically less than 0.2mm), Ferrite sheets can also improve the efficiency of wireless power transfer.
Ferrite sheets provide so much versatility there is almost no limit in how you could utilize them in your application, so how do they actually work ? Since the material consist of soft magnetic metals with high permeability, it is very effective at suppressing noise emission which it achieves by absorbing and converting the EMI into heat.
For an example application we are going to look at mobile phones, with the ever increasing demands and advances in the technology utilising more SoC (System on a Chip) which include multiple ICs (Integrated Circuits) which produce large amounts of EMI noise causing a “self-poisoning” effect. To avoid this Ferrite sheet material can be place over key areas of vulnerability such as over the SoC (or mount the SoC over the sheet), around connection pads and over FPC’s.
As a quick round up on Ferrite sheets, they are incredibly versatile with far fewer mechanical restraints than traditional soft-magnetic components. They can be easily processed to suit your applications, being able to be cut by a knife so requiring no special equipment or machinery. It’s flexibility allowing for it to be wrapped around cables or placed over the top of flexible cables