Analysis of different Sleeve Ferrite Cores Performance according to their Dimensions

Sleeve ferrite core is an EMI suppressor widely used to reduce the conductive and radiated electromagnetic noise in cables. The interconnection of different electronic systems through cables is becoming more difficult due to the hard restrictions related to EMC compliance requirements. Thereby, the research of new solutions able to provide a great attenuation ratio in a wide frequency band is a challenge. This contribution focuses on analyzing and comparing the performance of a novel sleeve ferrite solution based on a nanocrystalline (NC) structure with several materials with different compositions. This component is able to provide a high initial permeability value at the same time that maintains it up to some tens of megahertz. In terms of dimensions, NC suppressors can provide the same effectiveness than other materials with more reduced dimensions. The analysis of the impedance dependence of a sleeve ferrite core with its dimensions has been carried out. Five ceramic materials with different initial permeabilities from 380 up to 5000 has been compared with the NC core through representing their impedance traces. The results presented shows that NC provides the higher impedance throughout the frequency range of 1-500 MHz when it is compared with ceramic cores with the same dimensions.