Abstract
Ferrite beads used for the supression of electromagnetic interference (EMI) were analysed using the finite difference time domain (FDTD) method. The presence of the bead results in reflected current, cable radiation and resonant characteristics which significantly affect the ability to suppress currents uniformly over a wide frequency range. A typical low conductivity ferrite bead (σ = 1 µS/m, ɛr = 1, μr = 100), with length L = 21 mm and outer diameter D = 11 mm is shown to be a poor isolator at 1.03, 1.71, 2.37 and 2.93 GHz due to this resonance phenomenon. The effective suppression of EMI depends on the properties and dimensions of the ferrite bead in addition to the frequency of operation.
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