IEC PAS 63446:2022
(Main)Conversion method of specific absorption rate to absorbed power density for the assessment of human exposure to radio frequency electromagnetic fields from wireless devices in close proximity to the head and body - Frequency range of 6 GHz to 10 GHz
Conversion method of specific absorption rate to absorbed power density for the assessment of human exposure to radio frequency electromagnetic fields from wireless devices in close proximity to the head and body - Frequency range of 6 GHz to 10 GHz
IEC PAS 63446:2022, a Publicly Available Specification, provides the method to conservatively evaluate the area averaged electromagnetic (EM) power density entering the human body, i.e. the absorbed power density (APD), for communication devices intended to be used at a position near the human head or body, or mounted on the body, combined with other transmitters within a product, or embedded in garments. The device categories covered include but are not limited to mobile telephones, radio transmitters in personal computers, and desktop and laptop devices. The applicable frequency range is from 6 GHz to 10 GHz.
This document specifies:
conversion of the psSAR to the psAPD (Clause 6);
uncertainty estimation (Clause 7);
reporting requirements (Clause 8);
methods of validation and system check (Annex C)
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IEC PAS 63446 ®
Edition 1.0 2022-10
PUBLICLY AVAILABLE
SPECIFICATION
Conversion method of specific absorption rate to absorbed power density for
the assessment of human exposure to radio frequency electromagnetic fields
from wireless devices in close proximity to the head and body – Frequency
range of 6 GHz to 10 GHz
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IEC PAS 63446 ®
Edition 1.0 2022-10
PUBLICLY AVAILABLE
SPECIFICATION
Conversion method of specific absorption rate to absorbed power density for
the assessment of human exposure to radio frequency electromagnetic fields
from wireless devices in close proximity to the head and body – Frequency
range of 6 GHz to 10 GHz
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20 ISBN 978-2-8322-5854-5
– 2 – IEC PAS 63446:2022 © IEC 2022
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviated terms . 9
4.1 Physical quantities . 9
4.2 Constants . 10
4.3 Abbreviations . 10
5 Application of this document . 10
6 APD conversion method by evaluation of the SAR distribution . 11
7 Uncertainty estimation . 11
7.1 Measurement uncertainty . 11
7.2 Numerical uncertainty . 12
8 Measurement and computational report . 12
Annex A (informative) Rationale for conversion of psSAR into psAPD . 13
Annex B (informative) Poynting vector and absorbed power density . 14
B.1 Introduction . 14
B.2 Electric fields and magnetic fields in a lossy half space . 14
B.3 Power density absorbed in the lossy half space . 15
B.4 Power transmitted by the Poynting vector of the TE-waves . 16
B.5 Power transmitted by the Poynting vector of the TM-waves . 17
B.6 Summary . 18
Annex C (normative) Reference dipoles and psAPD values for system check and
validation . 19
C.1 System check and validation . 19
C.2 Reference dipoles . 19
C.3 Numerical model of the system check dipoles . 20
Annex D (normative) Supplemental files and their checksums . 21
Bibliography . 22
Figure C.1 – Mechanical details of the standard dipoles. 19
Table 1 – Conversion factors for psSAR to psAPD . 11
Table 2 – Uncertainty budget template for evaluating the uncertainty in the measured
value of the psAPD of a DUT or validation antenna . 12
Table C.1 – Mechanical dimensions of the reference dipoles . 20
Table C.2 – Parameters of the dielectric components of the CAD models of the
reference dipoles . 20
Table C.3 –Numerical psAPD target values (rotating square) and the values converted
from numerical psSAR results . 20
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONVERSION METHOD OF SPECIFIC ABSORPTION RATE TO ABSORBED
POWER DENSITY FOR THE ASSESSMENT OF HUMAN EXPOSURE TO
RADIO FREQUENCY ELECTROMAGNETIC FIELDS FROM WIRELESS
DEVICES IN CLOSE PROXIMITY TO THE HEAD AND BODY – FREQUENCY
RANGE OF 6 GHZ TO 10 GHZ
FOREWORD
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A PAS is an intermediate specification made available to the public and needing a lower level
of consensus than an International Standard to be approved by vote (simple majority).
IEC PAS 63446 has been processed by IEC technical committee 106: Methods for the
assessment of electric, magnetic and electromagnetic fields associated with human exposure.
The text of this PAS is based on the This PAS was approved for
following document: publication by the P-members of the
committee concerned as indicated in
the following document
Draft PAS Report on voting
106/572/DPAS 106/580/RVDPAS
Following publication of this PAS, which is a pre-standard publication, the technical committee
or subcommittee concerned may transform it into an International Standard.
– 4 – IEC PAS 63446:2022 © IEC 2022
This PAS shall remain valid for an initial maximum period of 2 years starting from the publication
date. The validity may be extended for a single period up to a maximum of 2 years, at the end
of which it shall be published as another type of normative document, or shall be withdrawn.
This document contains supplemental files that are detailed in Annex D. These files can be
downloaded from https://www.iec.ch/tc106/supportingdocuments.
INTRODUCTION
This document provides the method to conservatively evaluate the area averaged
electromagnetic (EM) power density entering the human body, i.e. the absorbed power density
(APD), for communication devices intended to be used at a position near the human head or
body, or mounted on the body, combined with other transmitters within a product, or embedded
in garments. The device categories covered include but are not limited to mobile telephones,
radio transmitters in personal computers, and desktop and laptop devices. The applicable
frequency range is from 6 GHz to 10 GHz.
This document specifies:
• conversion of the psSAR to the psAPD (Clause 6);
• uncertainty estimation (Clause 7);
• reporting requirements (Clause 8);
• methods of validation and system check (Annex C)
The measurement and computational standards IEC/IEEE 63195-1:2022 [1] and
IEC/IEEE 63195-2:2022 [2] for incident power density (IPD) cover the frequency range from
6 GHz to 300 GHz. Hence there is a frequency overlap from 6 GHz to 10 GHz between this
document on APD and the IEC/IEEE standards addressing IPD. The committee was aware of
this fact and opted for enhanced flexibility by providing methods for basic restriction metric APD
in addition to reference level metric IPD.
___________
Numbers in square brackets refer to the Bibliography.
– 6 – IEC PAS 63446:2022 © IEC 2022
CONVERSION METHOD OF SPECIFIC ABSORPTION RATE TO ABSORBED
POWER DENSITY FOR THE ASSESSMENT OF HUMAN EXPOSURE TO
RADIO FREQUENCY ELECTROMAGNETIC FIELDS FROM WIRELESS
DEVICES IN CLOSE PROXIMITY TO THE HEAD AND BODY – FREQUENCY
RANGE OF 6 GHZ TO 10 GHZ
...
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