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Description
This study investigates electromagnetic exposure assessment in an indoor environment equipped with Reconfigurable Intelligent Surfaces (RIS) for 6G communications, focusing on FR1 frequency band implementations. Electric field distributions and Specific Absorption Rate (SAR) in a three-room office environment was assessed. The analysis employed ray tracing to calculate electromagnetic fields in the studies environment generated by a 10-by-10 RIS array operating at 5 GHz. Four anatomical models from the Virtual Population, representing diverse age groups (6-34 years), were utilized to assess whole-body and brain SAR through a two-step calculation methodology. Results revealed significant model-dependent variations in exposure patterns, with maximum SARwb reaching 2.9 mW/kg in adult male model and SARbrain at 0.7 mW/kg in the female teenager. Spatial distribution analysis, quantified through kurtosis and coefficient of variation metrics, demonstrated that exposure patterns were primarily concentrated along beam focal directions, with adult models exhibiting greater variability in terms of exposure levels than younger subjects. Notably, this study evidenced that non-users positioned along beam trajectories might be the potentially exposed to higher levels than users in the RIS-equipped room. All exposure values remained well below ICNIRP Guidelines, suggesting compliance with international safety standards.
