Study of a Novel High Permeability Ferrite Sheet Intended for Near Field Communication Systems

The reduction of embedded portable devices involves a magnetic field interference problem when it integrates Near Field Communication (NFC) due to the presence of conductive surfaces such as ground planes, batteries or metallic enclosures. This contribution is focused on analyzing the ability of an innovative magnetic shielding based on flexible sintered ferrite sheets (FSFS) with the aim of improving the performance of that kind of systems. Thereby, a NFC emitter antenna is characterized when it is close to a conductive surface through an electromagnetic (EM) scanner. The EM scanner composed by a matrix of near field probes that make it possible to determine the effectiveness of the FSFS. The performance analysis is carried out through comparing the power emitted by the antenna with and without placing the FSFS between the antenna and the metallic plane. The results obtained show the ability of this component to shield the communication area from the conductive surface, preserving the original transmitted signal without reducing the communication performance.