Low-loss spinel nanoferrite with matching permeability and permittivity in the ultrahigh frequency range
作者： A. Thakur , A. Chevalier , J.-L. Mattei , P. Queffélec
DOI: 10.1063/1.3455875
关键词: Permittivity 、 Dielectric loss 、 Spinel 、 Relative permittivity 、 Analytical chemistry 、 Materials science 、 Refractive index 、 Electrical impedance 、 Coprecipitation 、 Permeability (electromagnetism)
摘要: Ferrite nanoparticles with a composition of Ni0.5Zn0.3Co0.2Fe2O4 were prepared by coprecipitation method. The sample obtained after treating at appropriating conditions had almost equal real permeability and permittivity, 4.8+j0.15 (loss tangent∼0.04) 4.9+j0.10 tangent∼0.018), respectively, over 100 to 500 MHz. This material refractive index n close 5 reduced impedance Z/Z0 1. These properties make the useful design miniaturized antennas very high frequency-ultra frequency (VHF-UHF) (100–500 MHz) bands.
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