Network Model of a Transmission Line with a Cable Ferrite for Simulation in LTspice

Cable ferrite sleeves are common suppression components for reducing common-mode noise on wires and cables. This paper continues previous work on the characterization of those components regarding their electrical parameters. In this paper the parameters of a low-permeability nickel-zinc ferrite sleeve are extracted using the core geometry and measured permittivity and permeability data up to 5 GHz. Then a lumped element transmission line model, including the ferrite, is set up as a netlist for numerical circuit simulation in LTspice®. From the results the current distribution along the transmission line is extracted at different frequencies and compared with the analytical solution. In the second part a 3D full-wave model of the transmission line, created and simulated in CONCEPT-II, is presented. The results of this approach are compared with the analytical solution for the current distribution, showing a perfect match.