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Wide Frequency Characterization of Magnetic Properties of Commercial LTCC Ferrite Material
Keywords: LTCC ferrite materials, magnetic properties determination, complex magnetic permeability
Complex magnetic permeability and hysteresis characteristic are key parameters that determine properties of ferrite components. This paper offers effective, accurate and simple method for complex permeability determination of LTCC (Low Temperature Co-fired Ceramic) ferrite sample at wide frequency range (up to 1 GHz). In comparison with some other coaxial techniques that are widely used elimination of undesirable influences, such as optimization and phase compensation, is not needed. Presented research can be found to be of importance in fields of ferrite components design and application, as well as RF and microwave engineering. In addition, hysteresis properties of investigated material are determined. The characterization sample is a stack of LTCC tapes forming a toroidal shape structure. Commercially available ferrite tape ESL 40012 was used and standard LTCC processing applied for the sample fabrication. Permeability is determined in the frequency range from 10 kHz to 1 GHz and characterization procedure is divided in two segments - for low and high frequencies. Low frequency measurements (from 10 kHz to 1000 kHz) are performed using LCZ meter and discrete turns of wire, while a short coaxial sample holder and Vector Network Analyzer were used for the higher frequency range (from 1000 kHz to 1 GHz). B-H hysteresis loops were measured with BROCKHAUS Tester MPG 100D system using the maximum excitation of 2 kA/m and frequencies of 50 Hz, 500 Hz and 1000 Hz. Obtained results show good agreement with datasheet values given by the manufacturer at lower frequencies and are in good correlation with results extracted from designed dispersion model at higher frequencies. The best match between measured results and fitted characteristics is achieved for frequencies from 50 MHz, implying accuracy of the presented model at higher frequencies. The real and imaginary parts of measured and fitted characteristics intersect at the same frequency (9.3 MHz).
Nelu Blaž, Student
University of Novi Sad, Faculty of Technical Sciences, Department of Electronics
Novi Sad 21000,
Serbia


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