Effective parameters of metal-dielectric composites: influence of eddy currents due to density fluctuations

¹ Institute of Theoretical and Applied Electromagnetism (ITAE), Russian Academy of Sciences, Izhorskaya 13/19, 127412 Moscow, Russia
² Laboratoire de Génie Électrique de Paris, Plateau de Moulon, 91192 Gif-Sur-Yvette Cedex, France

Corresponding author: said.zouhdi@u-psud.fr

Received: 16 April 2008
Revised: 1 December 2008
Accepted: 5 January 2009
Published online: 10 March 2009

Abstract

It is shown that the space fluctuations of concentration of conducting inclusions might be responsible for the well-known disagreement between theory and experiment at determining microwave losses in metal-dielectric mixture: the theories (percolation theory, effective medium theory, etc.) predict much lower losses than those measured in experiment. It is demonstrated that if the effective skin depth in the regions occupied by the fluctuation is comparable to the mean diameter of these regions we can expect additional losses.