A co-polarization-insensitive metamaterial absorber for 5G n78 mobile devices at 3.5 GHz to reduce the specific absorption rate

Abstract

Overview

Specific absorption rate (SAR) by next-generation 5G mobile devices has garnered significant concern globally. The prevalence of 5G technology in communication devices is projected due to its capabilities in supporting high-speed data transmission and IoT-based applications. Despite the benefits, these devices have a notably heightened SAR, necessitating engineering solutions to mitigate health risks.

Findings

This study introduces a metamaterial absorber (MMA) specifically designed for reducing SAR in 5G n78 mobile devices operating at 3.5 GHz. The design is co-polarization insensitive, which allows it to absorb unnecessary electromagnetic energies from all possible incident angles, adhering to the Poynting theorem. Key features include a unit cell size of 0.114 λ, making it highly efficient for integration into mobile devices. Experimentally, it has been proven to achieve at least a 33% reduction in SAR levels.

Conclusion

Through both numerical studies and experimental verifications, the implemented MMA exhibits a substantial drop in SAR values, acknowledging the critical balance between ensuring efficient communication and lowering health risks associated with electromagnetic radiation in next-generation mobile devices. The MMA's design strategy focusing on specific resonance frequencies and unique structural components marks an advancement in aligning technology with critical health standards.