Electromagnetic exposure analysis of the subway passenger under the civil communication system radiation
Abstract
Overview
This study assesses the safety of electromagnetic exposure for subway passengers under the civil communication system using advanced modeling techniques.
Methodology
- Employed COMSOL Multiphysics software to construct the radio-frequency (RF) electromagnetic environment model of a subway carriage.
- Utilized two types of leaky coaxial cables (LCX1 and LCX2) as exposure sources within the model setup.
- Measured and verified the electromagnetic environment model through real-world field measurements.
Findings
The findings indicate that the electromagnetic dose absorbed by passengers was significantly reduced when using LCX1 compared to LCX2, with reductions of 9.19% and 22.50% at frequencies of 2100 MHz and 2600 MHz respectively. At 3400 MHz, the highest specific absorption rate (SAR) observed was 1.91×10−4 W/Kg and a corresponding temperature rise of 0.214 K.
Conclusion
The study concludes that the electromagnetic exposure of subway passengers remains within safe limits as prescribed by the ICNIRP. Moreover, the use of LCX1 potentially offers enhanced 5G signal coverage while reducing the SAR absorbed by passengers, suggesting a promising approach for managing public electromagnetic exposure.