Electromagnetic exposure analysis of the subway passenger under the civil communication system radiation

Authors: Zhou WY, Zhang XY, Lu M

Year: 2024 Mar 11

Category: Electromagnetic Field Safety Analysis

Journal: PLoS One

DOI: 10.1371/journal.pone.0300049

URL: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0300049

Abstract

Overview

This study evaluates the electromagnetic exposure safety for subway passengers within the context of civil communication systems. The research utilizes COMSOL Multiphysics software to establish a comprehensive radio-frequency (RF) electromagnetic environment inside a subway carriage. The model incorporates both 1-1/4" (LCX1) and 1-5/8" (LCX2) leaky coaxial cables as the sources of exposure and simulates twelve passengers at various positions, with validation through field measurements.

Findings

  • The exposure dose distribution of passengers was analyzed for both LCX1 and LCX2 systems.
  • Simulation showed that, compared to LCX2, LCX1 reduced passenger electromagnetic dose by 9.19% at 2100 MHz and by 22.50% at 2600 MHz.
  • The maximum specific absorption rate (SAR) recorded was 1.91×10-4 W/Kg, and the highest temperature increase observed was 0.214 K when LCX1 operated at 3400 MHz.

Comparison to Safety Standards

The results were compared with the public exposure limits established by the International Commission of Non-Ionizing Radiation Protection (ICNIRP), demonstrating electromagnetic exposure safety for passengers within the scope of current regulations. Notably, the LCX1 system could supplement 5G signal coverage while also reducing the SAR absorbed by passengers.

Conclusion

  • Adjusting the radiation characteristics of exposure sources, such as using LCX1, offers a new approach to safeguarding public health against electromagnetic field exposure in subway environments.
  • Reduction of public electromagnetic exposure dose is achievable, highlighting the need for continuous innovation in exposure mitigation strategies.
electromagnetic fields subway exposure SAR public health radio-frequency 5G civil communication systems
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