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Pommerenke, David
Graz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2023On the Difficulties to Determine the Intrinsic Material Parameters for MnZn Ferritescitations
- 2023The distribution of discharge amplitudes of randomly colliding charged spherescitations
- 2023A Method to Determine the Permittivity of Anisotropic Thin Sheet Absorber Materials
- 2018Characterization of relative complex permittivity and permeability for magneto-dielectric sheetscitations
- 2018Measurement of Dielectric Constant and Cross-Sectional Variations of a Wirecitations
- 2018Common-mode impedance of a ferrite toroid on a cable harness
- 2012Nonlinear capacitors for ESD protectioncitations
- 2011Rapid rotary scanner and portable coherent wideband Q-band transceiver for high-resolution millimeter-wave imaging applicationscitations
- 2002Efficient FDTD simulation of fields in coaxial cables with multi-layered insulation partially formed by dispersive layers of extremely high permittivitycitations
- 2000Broadband measurement of the conductivity and the permittivity of semiconducting materials in high voltage XLPE cables
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document
On the Difficulties to Determine the Intrinsic Material Parameters for MnZn Ferrites
Abstract
This paper investigates the difficulties of obtaining intrinsic material parameters, permeability, conductivity, and permittivity of MnZn ferrites for the frequency range that is relevant for radiated EMI simulations, up to 300 MHz. Due to the high relative permeability (e.g., 3000 at 1 MHz) and high relative permittivity (e.g., 50000 at 1 MHz) combined with significant DC conductivity it is difficult to obtain intrinsic material parameters needed for electromagnetic full wave simulations. Further, the complexity increases with increasing frequency (e.g., 5 MHz) due to negative apparent permeability. Skin effect and dimensional resonances within the test objects cause a violation of the basic assumptions that are used to extract material parameters from a sample, since the parameters retrieved depend on the size and shape of the test samples. Carefully conducted experiments further showed that the material shows non-reciprocal behavior without DC magnetization and the possibility that the magnetic flux not only depends on the magnetic field, but also on the electric field, suggesting the possibility of bi-anisotropic behavior.