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

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.
Type de document :
Communication dans un congrès
IEEE International Conference on Ferrites, May 2009, Sacramento, United States. pp.BF-09, 2009
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http://hal.univ-brest.fr/hal-00489017
Contributeur : Jean-Luc Mattei <>
Soumis le : lundi 14 juin 2010 - 15:19:04
Dernière modification le : mardi 23 janvier 2018 - 12:04:02
Document(s) archivé(s) le : mardi 14 septembre 2010 - 20:14:18

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  • HAL Id : hal-00489017, version 1

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Atul Thakur, Jean-Luc Mattei, Alexis Chevalier, Patrick Queffelec. Low-loss Magnetodielectric Spinel-ferrite Based Ceramic with Constant Permeability and Permittivity in the UHF Range. IEEE International Conference on Ferrites, May 2009, Sacramento, United States. pp.BF-09, 2009. 〈hal-00489017〉

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