THE NEAR FIELD OF DIPOLE AND HELICAL ANTENNAS
Q. Balzano, O. Garay, K. Siwiak
Current EMF safety standards near antennas may be overly restrictive by measuring stored energy instead of penetrating radiation.
Plain English Summary
This technical study measured electric field strength around dipole and helical antennas used in portable communication devices. Researchers found that near antennas, current safety standards based on electric field measurements are overly restrictive because they don't account for how electromagnetic energy actually penetrates human tissue. The study shows that reactive energy stored around antennas has high impedance and isn't all available for tissue penetration.
Why This Matters
This research exposes a fundamental flaw in how we measure EMF safety near portable devices. The science demonstrates that our current protection standards, which rely on electric field strength measurements, don't distinguish between energy that can actually penetrate your body and energy that simply exists around the antenna. Put simply, when you're close to your phone or wireless device, the safety criteria may be unnecessarily strict because they're measuring the wrong thing. What this means for you is that near-field exposure assessments using standard methods may overestimate actual biological risk. The reality is that reactive electromagnetic energy stored around antennas behaves differently than the radiating energy that travels away from devices, yet our safety standards treat them the same.
Finding
In the close proximity of sources the safety criteria are no longer valid because the value of |E|2 is not directly related to power flow, but, rather, to the level of electric energy stored around the radiator. This reactive energy, because of its high impedance, is not all available for penetration and deposition in human tissue. So, in the near field of radiators a Safety Standard based only on the value of |E| can be exceedingly restrictive, as shown by the measurements presented in the paper.
In their words
“In the close proximity of sources the safety criteria are no longer valid because the value of |E|2 is not directly related to power flow, but, rather, to the level of electric energy stored around the radiator. This reactive energy, because of its high impedance, is not all available for penetration and deposition in human tissue. So, in the near field of radiators a Safety Standard based only on the value of |E| can be exceedingly restrictive, as shown by the measurements presented in the paper.”
Figures from the Original Paper
Diagrams extracted from the original research document.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{the_near_field_of_dipole_and_helical_antennas_g4640,
author = {Q. Balzano and O. Garay and K. Siwiak},
title = {THE NEAR FIELD OF DIPOLE AND HELICAL ANTENNAS},
year = {n.d.},
}