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Li K, Kodera S, Poljak D, Prokop A, Diao Y, Zhang S, Yao M, Li C, Wu T, Liebig T, Simon W, Škiljo M, Hirata A

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Authors not listed · 2025

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Antenna design creates more variation in facial radiation exposure than measurement methods at 10-30 GHz frequencies.

Plain English Summary

Summary written for general audiences

An international research team compared how different methods measure power absorption and temperature rise in human face models exposed to 10 GHz and 30 GHz antenna radiation. They found that when proper averaging methods are used, power absorption correlates with temperature increases in realistic face models. The study revealed that antenna design has more impact on radiation absorption patterns than the specific measurement method used.

Why This Matters

This study addresses a critical gap in how we measure EMF exposure from devices held close to the face, like smartphones operating at increasingly higher frequencies. The research demonstrates that power absorption and temperature rise are indeed related when measured properly, validating new international exposure guidelines. What's particularly significant is the finding that antenna design matters more than measurement methodology - meaning the specific radiation pattern of your device has a bigger impact on your exposure than previously thought. As 5G networks push into these higher frequency ranges (10-30 GHz), understanding how power concentrates in facial tissues becomes essential. The study's focus on 'power absorption focality' - how tightly radiation concentrates in tissue - suggests that some antenna designs create hotspots of exposure that others don't, making device-specific exposure assessments more important than ever.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 10-30 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 10-30 GHzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHzLogarithmic scale

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2025). Li K, Kodera S, Poljak D, Prokop A, Diao Y, Zhang S, Yao M, Li C, Wu T, Liebig T, Simon W, Škiljo M, Hirata A.
Show BibTeX
@article{li_k_kodera_s_poljak_d_prokop_a_diao_y_zhang_s_yao_m_li_c_wu_t_liebig_t_simon_w_kiljo_m_hirata_a_ce4741,
  author = {Unknown},
  title = {Li K, Kodera S, Poljak D, Prokop A, Diao Y, Zhang S, Yao M, Li C, Wu T, Liebig T, Simon W, Škiljo M, Hirata A},
  year = {2025},
  doi = {10.1088/1361-6560/ae2ce1},
  
}
DOI: 10.1088/1361-6560/ae2ce1PubMed: 41397352

Quick Questions About This Study

The study found that power absorption at these frequencies correlates with temperature rise in facial tissues when proper averaging methods are applied. Higher frequencies like 30 GHz tend to concentrate energy more at the skin surface.
Yes, the research revealed that antenna type and positioning had a more pronounced impact on radiation absorption variability than differences in measurement averaging methods or even anatomical modeling variations between individuals.
EPD/APD is a new measurement in international exposure guidelines that quantifies power absorption at body surfaces, specifically designed to assess temperature rise from high-frequency radiation like 5G millimeter waves.
The study used refined high-resolution anatomical face models extracted from whole-body models to ensure computational accuracy at 10 GHz and 30 GHz, suggesting detailed modeling is important for these frequencies.
Power absorption focality refers to how concentrated radiation becomes in tissue. The study found this varies significantly by antenna design, meaning some devices may create localized hotspots while others distribute energy more evenly.