METHODOLOGICAL PRINCIPLES OF DEVELOPMENT OF LIQUID MIXTURES FOR THE SHIELDING OF ELECTROMAGNETIC FIELDS

Abstract

It is shown that in conditions of increasing amplitudes and expanding the frequency spectrum of man-made electromagnetic fields, the most suitable shielding materials are composites with the required properties. A feature of composite materials of all classes is the lack of standard reference data on their efficiency and electrophysical and magnetic properties, which determine the shielding coefficients. To simplify the design processes of shielding mixtures, it is advisable to make a preliminary calculation of the values of the dielectric and magnetic permeability and the specific conductivity of the final material. The possibility of using the Lorentz, Maxwell-Garnett, Odelevsky and Lichtenecker ratios for these calculations was analyzed. The related difficulties and limits of application and the need to take into account the morphology of shielding particles in the matrix are shown. It is emphasized that the dependence of electrophysical properties of components on the frequency of the field that requires shielding should be taken into account in the design process. This approach makes it possible to obtain liquid materials with different properties for the formation of a multilayer structure: the upper layer can have the minimum reflection coefficient, and the lower one - the maximum absorption properties. The sequence of actions in the design of protective compositions for the rationalization of project works is given.