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Влияние защитного покрытия реконфигурируемой интеллектуальной поверхности на ее характеристики
Reconfigurable Intelligent Surfaces (RISs) are promising devices capable of increasing the bandwidth and coverage area of new and existing wireless networks. Nowadays, most of these devices are presented in the form of prototypes that have no environmental protection and are not adapted for implementation in existing communication systems. However, protective coating may significantly affect the characteristics of RIS and reduce its effectiveness. This work considers the influence of thickness, dielectric permittivity, and loss tangent of the most common materials for protective coating on the amplitude and phase response characteristics of the RIS unit cell. As a result, the paper gives recommendations on the choice of the material and its thickness and on the correction of unit cell sizes for various parameters of the protective coating.