Abstract
The purpose of the work is to develop the principles of designing electromagnetic screens taking into account diffraction phenomena and methodological approaches to the automation of design work. Results. The principal approaches to the design of materials and structures for shielding electromagnetic radiation are considered. It is shown that for shielding radiation with frequencies up to 1 GHz, it is necessary to take into account the diffraction phenomena at the edges of flat structures, which cause the presence of “penumbra”. A convenient mathematical apparatus for determining the size of the penumbra depending on the wavelength of incident electromagnetic radiation is provided. The need to account the reflection of electromagnetic waves from building structures, flat surfaces of technological equipment, and other objects in the design of electromagnetic screens is substantiated. The corresponding computation procedure is offered. Practical significance. The obtained functions allow modelling the propagation of radiation in the protected area and selecting the necessary parameters of the composite shielding material in the automated mode. The main parameters are the content and dispersion of the metal substance and the thickness of the material. They determine the contribution of the reflection and absorption coefficients of electromagnetic waves to the overall shielding coefficient. This makes it possible to optimize the parameters of the shielding design on the principles of reasonable sufficiency.
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