3. Dielectric properties of media

Materials are generally classified as either magnetic or non-magnetic. Unlike non-magnetic materials, magnetic materials have magnetic dipoles that are strongly affected by applied fields.

The materials encountered in radiofrequency dosimetry, human tissue but also textiles such as cotton, silk, leather, etc., are non-magnetic materials and their magnetic permeability is that of a vacuum (µ = µ ₀ = 4.10 ^-7 H/m). This makes permittivity the key parameter for determining the distribution of the electromagnetic field in the body and therefore the power dissipated there.

Anisotropy is negligible in textiles and human tissue (for frequencies above MHz), which simplifies the general form of the electrical permittivity tensor into a complex scalar quantity:...

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Dielectric properties of media

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page Basics of electromagnetism

Specific absorption rate measurement

Bibliography

(1) - DROSSOS (A.), SANTOMAA (V.), KUSTER (N.) - The dependence of electromagnetic energy absorption upon human head tissue composition in the frequency range of 300-3000 MHz. - IEEE Transactions on Microwave Theory and Techniques, Vol. 48, N° 11, p. 1988-1995 (nov. 2000).
(2)...

Software tools

Microwave Studio:

https://www.cst.com/Applications/Index/SAR-Simulation

FEKO :

https://www.feko.info/applications/biomedical

Websites

Radio frequency portal – health – environment

http://www.radiofrequences.gouv.fr/

(page consulted on July 3, 2015)

Standards and norms

Guide for setting exposure limits to electric, magnetic and electromagnetic fields – Alternating fields (time-varying frequency, up to 300 GHz, ICNIRP 1998.

IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. - IEEE Standard C95.1-2005 -
Human exposure to radiofrequency fields produced by wireless communication devices...

Regulations

Directive 2013/35/EU of the European Parliament and of the Council of June 26, 2013 on the minimum health and safety requirements regarding the exposure of workers to the risks arising from physical agents (electromagnetic fields).