Low-loss Magnetodielectric Spinel-ferrite Based Ceramic with Constant Permeability and Permittivity in the UHF RangeReport as inadecuate




Low-loss Magnetodielectric Spinel-ferrite Based Ceramic with Constant Permeability and Permittivity in the UHF Range - Download this document for free, or read online. Document in PDF available to download.

1 Lab-STICC - Laboratoire des sciences et techniques de l-information, de la communication et de la connaissance UMR 3192

Abstract : Ni-Co-Zn nanosized particles of composition Ni0.5Zn0.3Co0.2Fe2O4 were successfully prepared by co-precipitation method. After sintering the average grains size is about 100nm. The material obtained after adequate heat treatment lies between ceramic with porosity equal to 15% and composite medium. It shows almost constant complex permeability and permittivity in the frequency range from 100MHz to 1 GHz, and equal to ~3.5-j0.15 loss tangent~0.04 and ~6-j0.13 loss tangent~0.02 respectively. The refractive index n is close to 4.85. Relaxation phenomenon takes place at 2.34 GHz, an unusual high value for spinel ferrites. These electromagnetic properties, in particular the low levels of losses, show that this material could be useful to the design of miniaturized antennas in the VHF-UHF 30MHz-500MHz range of frequency.





Author: Atul Thakur - Jean-Luc Mattei - Alexis Chevalier - Patrick Queffelec -

Source: https://hal.archives-ouvertes.fr/



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