COMPLEX PERMITTIVITY AND PENETRATION DEPTH OF CERTAIN BIOLOGICAL TISSUE BETWEEN 40 AND 90 GHZ
Jochen Edrich, Patrick C. Hardee · 1975
Millimeter wave penetration studies on dead tissue may not accurately predict effects in living organisms.
Plain English Summary
German researchers in 1975 measured how deeply millimeter waves (40-90 GHz frequencies) penetrate into fat and muscle tissue from animals. They found that tissue properties changed significantly after death, affecting how electromagnetic waves interact with biological material.
Why This Matters
This early research laid crucial groundwork for understanding how high-frequency electromagnetic fields interact with living tissue. The 40-90 GHz range studied here is particularly relevant today as it overlaps with frequencies used in 5G networks and emerging wireless technologies. The finding that tissue properties change dramatically after death highlights a critical limitation in EMF research - studies on deceased tissue may not accurately reflect how living organisms respond to electromagnetic exposure. This matters because much of our understanding about EMF penetration depths comes from measurements on non-living samples, potentially underestimating or misrepresenting actual biological effects. The millimeter wave frequencies studied here have limited penetration depth, which industry often cites as evidence of safety, but this research suggests we need more sophisticated understanding of how these fields interact with living biological systems.
Exposure Information
Specific exposure levels were not quantified in this study.
Show BibTeX
@article{complex_permittivity_and_penetration_depth_of_certain_biological_tissue_between__g3954,
author = {Jochen Edrich and Patrick C. Hardee},
title = {COMPLEX PERMITTIVITY AND PENETRATION DEPTH OF CERTAIN BIOLOGICAL TISSUE BETWEEN 40 AND 90 GHZ},
year = {1975},
}