Frequency Characterization of Ferrite Beads in the Microwave Range for Nonlinear Applications

Abstract:

Ferrite beads are ferromagnetic materials that exhibit a small inductance at low frequencies, becoming resistive at high frequencies. These devices are used as low pass filters for reducing electromagnetic interference (EMI) in communications and power electronics because the resistive losses attenuate the undesired frequencies. As ferrite beads have a nonlinear behavior with current and frequency they have been used in nonlinear transmission lines (NLTLs) for high power microwave generation in space and defense applications. In this work, high frequency ferrite beads are characterized in the frequency range up to 1 GHz by measuring S₁₁ reflection parameter in order to calculate their complex permeability and losses, key parameters in the design of NLTLs. In addition, X-ray diffraction (XRD) is used to identify their chemical element composition. Finally, the motivation for this work is basically due to the limited information on ferrite materials provided by the manufacturers.

• Periodical: Materials Science Forum (Volume 802)
• Pages: 552-557
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.802.552
• Online since: December 2014
• Authors: Lauro Paulo Silva Neto*, J.O. Rossi, P.A.G. Dias, J.J. Barroso
• Keywords: Ferrite Beads, Microwave Generation, Nonlinear Applications, Reflection Parameter

References

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