ЗАГАЛЬНІ ЗАСАДИ ПРОЕКТУВАННЯ ЕЛЕКТРОМАГНІТНИХ ЕКРАНІВ ТА ЕКРАНУЮЧИХ КОНСТРУКЦІЙ

Under the complex electromagnetic environment created by external and internal sources, as well as the widespread use of wireless information transmission systems, the issues of shielding structures application are complicated. In particular, the need to ensure the stable operation of cell communications imposes certain restrictions on the shielding factors of protective materials. This requires determination of the common approaches to reasonable screening, taking into account both the protection of people from electromagnetic exposure and production needs. It is established that it is necessary to develop the pattern of electromagnetic screens designing taking into account the complexity of the electromagnetic environment. The purpose of the work is to develop general principles for the design of shielding materials and structures, taking into account the maximum permissible impact levels of magnetic and electromagnetic fields of different origin. The use of experimental data, regarding the dependence of the shielding factors on the thickness of the protective material, the content of the shielding metal and metalcontaining substance in the polymer matrix and the like, is substantiated and recommended for the design of magnetic and electromagnetic screens. The shielding factors of composite metal-polymer materials of different thickness and characteristics were determined for the industrial frequency magnetic field, electromagnetic field with a frequency of 1.8 GHz and geomagnetic field. The optimization of material parameters with respect to the effects of the fields of these three origins is defined to be impossible. The scheme which can be used in the presence of electromagnetic fields of different origin and wide frequency spectrum is presented. However, the prerequisite of such work is the monitoring of the electromagnetic environment in the production premises with the determination of the amplitude-frequency characteristics of electromagnetic fields of different origin. The design and implementation of protective materials and shielding structures based on the developed pattern is the most appropriate approach. This approach minimizes the time and expense involved in the work on electromagnetic safety