Physically Tenable Analysis and Control of Scattering from Reconfigurable Intelligent Surfaces

Csathó, Botond Tamás and Horváth, Bálint Péter (2025) Physically Tenable Analysis and Control of Scattering from Reconfigurable Intelligent Surfaces. INFOCOMMUNICATIONS JOURNAL, 17 (1). pp. 40-47. ISSN 2061-2079

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Abstract

Reconfigurable intelligent surface is a promising concept within the scope of smart radio environment, which is a key enabler of the future wireless networks. Efficient numerical modeling of such devices constitutes a fundamental and actively pursued research challenge. This study numerically analyzes the reflection properties of a particular reconfigurable intelligent surface with the aid of computational electromagnetics. A key advantage of utilizing full-wave simulations is that they capture all the physical phenomena within the structure, thus providing a physically stenable analysis method. An essential aspect of RIS modeling is the configuration pattern design of the surfaces. A standard objective function of the pattern design is the amount of energy reradiated toward the target direction. The utilization of full-wave simulations limits the applicable optimization methods. In this article, an intuition-based pattern search method is presented to design RIS configurations, with the radiation pattern of the RIS structure in free space as the objective function. The suggested method first identifies a set of configuration values, then exhaustively searches through their combinations, seeking for the highest anomalously reflected power. The first presented result is the demonstration of creating anomalous reflections, with the dominant reflection being electrically tunable. The second contribution is the aforementioned pattern search method, which enables the reradiation of the incident energy for numerous anomalous directions. The average scattering parameter amplitude for the scenario is 0.78. Finally, we also demonstrate the effect of the structure being finite in size. We conclude that the dominant radiation directions coincide with the modes of the infinite periodic counterpart.

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