By Topic

\hbox {Mg}_{1-{\rm x}}\hbox {Co}_{\rm x}\hbox {Fe}_{1.98}\hbox {O}_{4} Ceramics With Promising Magnetodielectric Properties for Antenna Miniaturization

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Kong, L.B. ; Nat. Univ. of Singapore, Singapore ; Li, Z.W. ; Lin, G.Q. ; Gan, Y.B.

We have studied the effects of concentration of cobalt and sintering temperature on the complex relative permittivity and permeability of MgFe1.98O4 ferrite ceramics. All samples were doped with 3 wt% Bi2O3 to improve the sintering properties of the Mg1-xCoxFe1.98O4 ceramics and thus attain a low dielectric loss tangent. X-ray diffraction data indicated that the ferrite samples all have a single-phase spinel structure and that there was no reaction between the ferrite and Bi2O3. In terms of microstructure development and grain growth, the effect of Bi2O3 is much more pronounced than that of Co. At a given concentration of Co, the magnetic properties can be fairly explained by a magnetic circuit model. The relationship between static permeability and the concentration of Co can be understood by using the single-ion model combined with the local uniaxial anisotropic model. Among the samples we prepared, Mg0.96Co0.04Fe1.98O4 sintered at 1000degC for 2 h has almost equal real permeability and permittivity-both approximately 10 - as well as sufficiently low dielectric and magnetic loss tangent over a range 3 to 30 MHz [the high-frequency (HF) band]. These properties that should be useful for miniaturization of HF antennas.

Published in:

Magnetics, IEEE Transactions on  (Volume:44 ,  Issue: 5 )