On Properties of Magneto-dielectric Composites in the Effective Medium Approximation

Authors	A.T. Morchenko¹ , L.V. Panina¹^,² , S.V. Podgornaya¹, V.G. Kostishyn¹ , P.A. Ryapolov³
Affiliations	¹ National University of Science and Technology, MISiS, 4, Leninskiy Pr., 119991 Moscow, Russia ² Institute for Design Problems in Microelectronics, RAS ³ Southwest State University, 94, 50 Let Oktyabrya Str., 305040 Kursk, Russia
Е-mail	dratm@mail.ru
Issue	Volume 6, Year 2014, Number 3
Dates	Received 19 May 2014; published online 15 July 2014
Citation	A.T. Morchenko, L.V. Panina, S.V. Podgornaya, et al., J. Nano- Electron. Phys. 6 No 3, 03073 (2014)
DOI
PACS Number(s)	41.20, 75.40.Gb, 75.47Lx, 77.22, 84.40. – x
Keywords	Radar absorbing material, Ultra-wideband absorber, Electromagnetic radiation (4) , Effective medium approximation (2) , Reflection coefficient (3) , Effective permeability and permittivity (2) .
Annotation	The development of ultra-broadband composite absorbers of electromagnetic waves depends largely on optimal combination of the medium characteristics that determine their absorption capacity and conditions for impedance matching and destructive interference. It is possible to achieve a higher absorption level in a wider frequency band by combining a variety of mechanisms enhancing the loss of electromagnetic field energy, for example, by combining specific constituents in a composite matrix. The analysis of various mixing models for constituent parameters is carried out in the effective medium approximation for ferrite-dielectric composites. It appears that the standard mixing rules do not explain the increase in the effective permittivity of ferrite composites in comparison with that of bulk ferrites. The proposed mechanism of such increase is based on the conductive properties of the ferrite granules and the equivalent capacitance effect. The developed model of permittivity calculation is based on the equivalent capacitor circuits and gives a satisfactory agreement with the experimental data.
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