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EXPOSURE ASSESSMENT OF PORTABLE WIRELESS DEVICES ABOVE 6 GHz.

Eduardo Carrasco1, Davide Colombi2, Kenneth R Foster3

  • 1Universidad Politécnica de Madrid, Madrid, Spain.

Radiation Protection Dosimetry
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Summary
This summary is machine-generated.

New 5G wireless devices require new safety assessments. Researchers show free space power density (PD) measurements are feasible near 5G antenna arrays, but body proximity effects need further study.

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Area of Science:

  • Electromagnetics and Wireless Communications
  • Bioelectrics and Computational Electromagnetics
  • Human Exposure to RF Fields

Background:

  • Emerging 5G wireless devices operating above 6 GHz utilize antenna arrays.
  • Current exposure compliance relies on specific absorption rate (SAR) at lower frequencies.
  • New dosimetric references, like power density (PD), are adopted for higher frequencies.

Purpose of the Study:

  • To investigate the feasibility of free space power density (PD) assessments for 5G antenna arrays.
  • To determine appropriate measurement distances for PD assessments.
  • To explore the impact of nearby bodies on antenna performance and RF energy.

Main Methods:

  • Theoretical analysis of electromagnetic fields.
  • Numerical simulations of antenna arrays and power density.
  • Exploration of measurement distances (λ/2 and λ/(2π)).

Main Results:

  • Meaningful free space PD assessments are possible at λ/2 distance from arrays.
  • Measurements can be performed as close as λ/(2π) with appropriate instrumentation.
  • Dissipative bodies placed very close (<λ/2π) can alter antenna currents and charges.

Conclusions:

  • Free space PD measurements are viable for 5G safety assessments.
  • The influence of nearby bodies on antenna performance requires further investigation.
  • Experimental studies on tissue heating in reactive near fields are recommended.