Overview of Standards and Technical Reports

Overview of ARIB Standards (STD-38)

1. Overview

STD Number RCR STD-38
Standard Name Radiofrequency-Exposure Protection
General Description

This standard specifies, as “Radiofrequency-Exposure Protection”, the nominal limit values of the strength of the electromagnetic field, and the specific absorption rate (SAR), which are considered not to affect human body which is exposed in the electromagnetic field in radio use, without causing undesirable electromagnetic phenomena (heat up in the deep part of human body, electric shock, high-frequency heat wound, etc.). This standard also prescribes the outline of the estimation methods (calculation methods, experiment methods, etc.) and the measurement procedures of the strength of the electromagnetic field which are required for the evaluation.

This standard covers electromagnetic fields in the frequency range from 10 kHz to 300 GHz, but electromagnetic exposure to patients for medical purposes is out of the scope.

In addition to the standard in the general public environment stipulated by laws and regulations, also defined are the standard in the occupational environment and auxiliary standards related to contact current and induced current.

To confirm the conformity of some particular radio equipment to this standard in detail, ARIB technical report “Methods of Evaluating Compliance for Radiofrequency-Exposure Protection Standard” (ARIB TR-T11) or ARIB Standard “Specific Absorption Rate (SAR) Estimation for Cellular Phone” (ARIB STD-T56 Ver. 3.3) shall be applied mutatis mutandis.

2. Amendment History

Ver. Amendment or Enactment Date Amendment summary
3.0 07.30.2019

Revision based on recent reports from information and communication council, the Ministry of Internal Affairs and Communications with respect to local absorption guideline and radio wave Protection Guidelines and revision of the Radio Act. Specifically, in the low frequency region (10 kHz to 10 MHz), electromagnetic field strength limit is changed, the auxiliary standard is reviewed, basic restrictions are introduced. Likewise, in the high frequency region (100 kHz to 300 GHz), expansion of the upper limit frequency of local absorption standard, additional standard value of incident power density above 6GHz, etc.
Since there are many additions and revisions from low frequency to high frequency, it is revised as version 3.0.

2.0 10.26.1999

Revise in accordance with partial revision of Regulations for Enforcement of Radio Act.

Add specifications for contact current and inducted current. Add local absorption standard.

1.0 09.09.1993 Enactment

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