The Influence of Ferrite Materials to NFC Antenna

The electromagnetic (EM) shielding sheets,ferrite materials, ofen sandwiched between NFC (Near Field Communication) tag and metal to increase its detection distance. However, the addition of this ferrite materials could affect the NFC antenna other performance at the same tine, especially the impedance and working frequency. In this paper and investigation, we proved that ferrite materials have an abvious influence on NFC antenna impedance and working frequency via HFSS and ADS simulation. When the real part of permeability of the EM shielding sheet changed from 90 to 150, the working frequency drifited from designed working frequency 13.56 MHz to 12.87 MHz as the rapid increasing of antenna port impedance. Using Magneto-Dynamic Analysis,the corresponding explanation is given.