Electromagnetic field exposure monitoring of commercial 28-GHz band 5G base stations in Tokyo, Japan

Authors: Liu S, Tobita K, Onishi T, Taki M, Watanabe S

Year: 2024 May 22

Category: Bioelectromagnetics

Journal: Bioelectromagnetics

DOI: 10.1002/bem.22505

URL: https://pubmed.ncbi.nlm.nih.gov/38778514/

Abstract

Overview

This study presents the latest results on radio frequency electromagnetic field (EMF) exposure for 28-GHz band 5G base stations in an urban area of Tokyo. Measurements were taken under real-world traffic conditions using a 5G smartphone paired with both omnidirectional and horn antennas.

Findings

  • The electric-field (E-field) intensity was significantly below the exposure limits, with a maximum E-field intensity in traffic-off cases upto 3.6 dB.
  • In traffic-on scenarios, the omnidirectional antenna showed up to 13 dB higher E-field intensities compared to the horn antenna, mainly due to undesired capture of radio waves from the smartphone.
  • Comparative analyses with 4G LTE and other 5G bands are included, alongside recommendations for obtaining meaningful EMF exposure data.

Conclusion

The study confirmed that all E-field measurements were within international safety limits, demonstrating variances in intensity based on antenna type and traffic conditions. Ongoing assessments following the expanse of 5G deployment are planned, with possible future studies contrasting different 5G bands.

5G electromagnetic field Tokyo exposure measurement radio frequency
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