Theoretical & numerical assessment of maximally allowable power-density averaging area for EMF exposure assessment above 6 GHz
Abstract
Overview
The study focuses on defining a conservative power density (PD) averaging area for electromagnetic frequency (EMF) exposure above 6 GHz, crucial for ensuring safety against temperature increases in human tissue.
Methodology
- Determination of a maximum averaging area that limits temperature increases under a specific threshold
- Use of analytical and numerical methods to validate maximum area for frequencies above 6 GHz
- Study includes both theoretical analysis and simulation of different transmission sources
Findings
The findings indicate:
- A validated threshold of 1 K temperature rise at power density limits of 10 W/m2
- The required averaging area is frequency dependent, and varies with distance from transmitters
- At distances >2 mm from the transmitters, the area ranged from 3 cm2 at frequencies <10 GHz to 1.9 cm2 at 100 GHz
- Lower correlation of the model at frequencies <10 GHz and close proximities
Conclusion
The study concluded that:
- The averaging area for limiting temperature increase in the skin effectively is frequency dependent
- Ensures safety by advocating for smaller, flexible averaging areas adapted to frequency and distance
- Systematic evaluation continues to refine EMF exposure assessment methods