Metasurface Absorber for Reduction of Specific Absorption Rate (SAR) at 5G n78 and n258 Communication Frequencies

Mário D. A. Tavares, Roberto B. Di Renna, Maurício Weber

DOI: 10.14209/sbrt.2025.1571151726

Evento: XLIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2025)

Keywords: Specific absorption rate (SAR) absorber metasurface

Abstract

In this study, the reduction of human electromagnetic exposure to millimeter waves is analyzed. Thus, the specific absorption rate (SAR) from mobile antennas used for next-generation 5G n78 and n258 communication frequencies is significantly decreased by an absorber based on periodically arranged metallic square spirals. The reduction of SAR with the optimized metasurface was investigated by CST Microwave Studio in layered human tissues by examining SAR with gram mass averaging. The proposed absorber exhibits an SAR reduction of 99.99% at 3.5 GHz and more than 80% at 26 GHz. The results are aligned with the safety compliance of the 5G user equipment.

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