EMI can be a problem for designers of many products. If we use mobile phones as an example, designers have to incorporate RFI shielding to stop unwanted RF emissions as well as to prevent other electrical equipment from interfering with the mobile phone operation. Designers may find that densely packed electronic assemblies may have internal components that interfere with each other, requiring electromagnetic shielding. When the EMI includes low frequency radiation, magnetic shielding is essential to assure proper operation of the electronic equipment.