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Standards Development
This document specifies computational procedures for conservative and reproducible computations of the absorbed power density (APD) or epithelial power density, which is a measure to quantify the dissipated electromagnetic power in the human head or body due to exposure to radiofrequency (RF) electromagnetic field (EMF) transmitting devices. The computational procedures described are finite-difference time-domain (FDTD) and finite element methods (FEM), which are used to determine electromagnetic quantities by solving Maxwell’s equations. The procedures specified here apply to exposure evaluations for the significant majority of the population during the use of hand-held and body-worn RF transmitting devices with known uncertainty. The methods apply to devices with single or multiple transmitters or antennas that operate with their radiating structure(s) at distances up to 200 mm from the human head or body.
This document can be employed to evaluate compliance with applicable APD limits of different types of RF transmitting wireless communication devices used in close proximity to the head and body, with or without RF transmitting or non-transmitting accessories, or of devices embedded in garments. The overall applicable frequency range of the specified protocols and procedures is from 6 GHz to 300 GHz.
The categories of wireless communication device covered in this document include but are not limited to mobile telephones, radio transmitters in personal computers, desktop and laptop devices, and multi-band and multi-antenna devices. The procedures of this document do not apply to APD evaluation of electromagnetic fields emitted or altered by devices or objects intended to be implanted in the body
The development of a standard to assess the APD in the human head or body in the frequency range from 6 GHz to 300 GHz using measurement techniques is proposed in a separate NWIP. The purpose of this standard is to complement the measurement procedures with the help of computational methods based on FDTD and FEM in the same manner the computational standard IEC/IEEE 63195-2 complements the measurement standard IEC/IEEE 63195-1.
In detail, this standard will specify particular requirements on the computational Maxwell solvers for the numerical quantification of the APD and define algorithms for the quantification of the APD according to the averaging areas specified in the exposure guidelines by ICNIRP and IEEE. Guidance will be given to limit the numerical errors for the computational evaluation of the absorbed electromagnetic power in the millimetre wave frequency range where the penetration depth is small. Moreover, the methods which are specified in the numerical standards of the 62704 series and in IEC/IEEE 63195-2 for the verification of the computational software and for the quantification of the computational uncertainty will be complemented according to the requirements for the assessment of the APD.
This work is partly based on previous IEC/IEEE TR 63572 ED1.
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