Matching impedance of Cd-substituted magnesium ferrites for wideband and miniaturized antennas

Impact Factor:6.2

DOI number:10.1016/j.jallcom.2019.153059

Journal:Journal of Alloys and Compounds

Key Words:Mg0.8Cd0.2Fe2-xSmxO4 compositesEnhanced magnetizationEquivalent permeability and permittivityLow loss

Abstract:The effects of Sm3+ ion substitution on the magnetic and dielectric properties of Mg ferrites (Mg0.8Cd0.2Fe2-xSmxO4) with 2.5 wt% Bi2O3 were investigated for use as high-frequency antenna substrates. Various concentrations of Sm3+ ions (x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10) were employed to modify the permeability (μ′) and permittivity (ε′) of the ferrites. Experimentally, the composites synthesized using the conventional solid-state reaction method exhibited equal μ′ and ε′ (x = 0.10, μ′ ≈ 23H/m, ε′ ≈ 25 F/m) over a long frequency band covering 1 MHz–100 MHz. Low loss tangents (dielectric loss tanδε≈ 0.004 and magnetic loss tanδμ≈ 0.038) were also obtained over the same frequency range. Furthermore, a saturation magnetization of up to 24.45 emu/g and coercivity of up to 36 Oe were achieved when x increased to 0.10, indicating that the magnetization of the samples was enhanced. The excellent properties obtained in the Sm3+ substituted Mg ferrites suggest that they could be promising candidates for modern high-frequency antenna substrates.

Indexed by:SCI

Discipline:Engineering

Document Type:J

Volume:819

Page Number:153059

ISSN No.:0925-8388

Translation or Not:no

Date of Publication:2020-01-28

Included Journals:SCI