Title :
Enhanced Microwave Magnetic and Attenuation Properties for Barium Ferrite Flaky-Filler Composites
Author :
Li, Z.W. ; Yang, Z.H. ; Kong, Ling
Author_Institution :
Temasek Labs., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
Microwave reflection characteristics as well as high frequency magnetic and dielectric properties have been studied for composites filled with Z-type barium ferrite flakes. Results show that both μ0´ and μmax´´are enhanced, while ε´ is almost the same, as compared to conventional composites. Therefore, the percentage bandwidth WP is significantly widened for the flaky-filler composites; WP achieves 130%-150% for reflection loss RL <; -10 dB. In addition, for all composites, two matching frequencies are found. The first matching frequency is attributed to the quarter-wavelength resonator and the second matching frequency is mainly controlled by the values of both μ´(f) and ε´(f) , where μ´/ε´=1/3 .
Keywords :
barium compounds; cobalt compounds; composite materials; ferrites; magnetic permeability; magnetic susceptibility; microwave materials; permittivity; zinc compounds; Ba3CoxZn2-xFe24O41; barium ferrite flaky-filler composites; dielectric properties; enhanced microwave attenuation properties; enhanced microwave magnetic properties; high frequency magnetic properties; microwave reflection loss; quarter-wavelength resonator; Bandwidth; Barium; Ferrites; Ions; Permeability; Permittivity; Resonant frequency; Electromagnetic (EM) compatibility and interference; ferrites; magnetic susceptibility; microwave magnetics;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2011.2158394