Abstract

Overview

The study focuses on the increasingly utilized 6 GHz spectrum by new wireless technologies, notably Wi-Fi®6E, which occupies frequencies both below and above 6 GHz. A significant challenge in EMF exposure assessments at these frequencies is the shift from using the Specific Absorption Rate (SAR) to Absorbed Power Density (APD) as the exposure metric.

Findings

• The study utilized numerical simulations and experimental measurements to investigate the discontinuity of power levels at the 6 GHz transition frequency using two antenna types: a dipole and a Planar Inverted F Antenna (PIFA).
• Assessments were conducted at multiple exposure distances, comparing the maximum power values compliant with both SAR and IPD limits under identical exposure conditions.
• Results indicated a critical distance (5 to 10 mm) where the most significant power reduction for compliance shifted from SAR to IPD. The level of discontinuity varied between 2 and 6 dB, dependent on distance and the source involved.

Conclusion

This research underlines a crucial discontinuity in power regulation linked to the EMF exposure metric used. Specifically, SAR proves more restrictive at closer distances, whereas IPD leads to a higher necessary reduction in power as distance increases, pointing to potential health risks associated with non-compliance.