Methodology for determining the threshold distance for estimating the main EM exposure contribution in WLAN

Abstract

Overview

The study explores the impact of location and proximity of radiation sources in wireless networks to characterize electromagnetic (EM) exposure levels. This is crucial for deploying future networks aimed at reducing EM field levels.

Methodology

• Introduction to a methodology for determining the threshold distance at which WiFi access point (AP) field strength levels are minimal compared to radiation from user equipment (UE).
• Implementation of theoretical concepts through simulations with actual WiFi antennas and supplemented by experimental measurements.

Findings

The threshold distance for EM exposure varies depending on the WiFi standard and operational conditions of the devices. Notably, higher power in UE decreases the safe threshold distance to the AP, indicating that scenarios with maximum UE power and minimal AP distance should be strictly avoided to enhance safety.

Conclusion

The identified threshold distances serve to guide EM exposure assessments and future measurement campaigns. Measurements and simulations confirmed that increased distances mitigate concerns over WiFi APs' EM contributions, especially in environments like schools or offices where exposure duration is also significant.