Dependence of microwave absorbing property on ferrite volume fraction in MnZn ferrite-rubber composites

Author

Kim, D.Y. ; Chung, Y.C. ; Kang, T.W. ; Kim, H.C.

Author_Institution

Korea Res. Inst. of Standards & Sci., Taejon, South Korea

Volume

32

Issue

2

fYear

1996

fDate

3/1/1996 12:00:00 AM

Firstpage

555

Lastpage

558

Abstract

The effective complex permeability and permittivity spectra in composites with various ferrite volume fractions were calculated using the Bruggeman effective medium theory. The matching conditions for the maximum microwave absorption were determined by substituting the complex permeability and permittivity in the equation for the impedance matching condition. The minimum reflection loss increases from -5 to -40 dB as the ferrite volume fraction increases for ν_f<0.26, where single dip of minimum reflection loss was observed. However, two matching conditions were observed for v_f⩾0.26, and two minimum reflection losses shown to be about -40 dB. The results indicate that a microwave absorber with reflection loss of about -40 dB can be designed by controlling the ferrite volume fraction in MnZn ferrite-rubber composites in the frequency range 0.8-12 GHz

Keywords

composite materials; electromagnetic wave absorption; electromagnetic wave propagation; ferrites; magnetic permeability; manganese compounds; microwave spectra; permittivity; rubber; zinc compounds; -5 to -40 dB; 0.8 to 12 GHz; Bruggeman effective medium theory; MnZn ferrite-rubber composite; MnZnFe₂O₄; complex permeability spectra; complex permittivity spectra; impedance matching; microwave absorption; reflection loss; Composite materials; Electromagnetic reflection; Ferrites; Frequency; Impedance matching; Magnetic materials; Optical reflection; Permeability; Permittivity; Rubber;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.486547

Filename

486547