IEC/IEEE 62704-1:2017 PDF

Overview

IEC/IEEE 62704-1:2017 specifies general requirements for using the finite-difference time-domain (FDTD) method to determine the peak spatial-average specific absorption rate (SAR) in the human body from wireless communications devices over 30 MHz to 6 GHz. The standard defines how to build and validate numerical device models, calculate peak spatial-average SAR in a cubical averaging volume, verify FDTD software implementation, and assess the uncertainty of SAR simulations. It does not set exposure limits (see ICNIRP or IEEE Std C95.1 for limits).

Key Topics and Requirements

• FDTD fundamentals and implementation checks
  • Required verification tests for correct E/H-field handling, absorbing boundary conditions and numerical dispersion.
• SAR calculation and averaging
  • Procedures for computing SAR in voxels and determining the peak spatial-average SAR in a cubical volume, including rules for voxel validity and averaging algorithms.
• Model validation and uncertainty assessment
  • Methods to validate numerical models of the Device Under Test (DUT) and to produce an uncertainty budget for simulation results (mesh resolution, positioning, dielectric properties, power scaling, convergence).
• Code verification and canonical benchmarks
  • Software validation using benchmark cases (e.g., dipole, microstrip, SAR Star) and documented pass/fail criteria for code accuracy.
• Practical modelling guidance
  • Computational considerations, voxel size guidance, source/load modelling, S-parameter and power calculations, and recommended anatomical or phantom models (informative annexes).

Applications and Who Uses It

IEC/IEEE 62704-1 is intended for professionals and organizations involved in RF safety assessment and electromagnetic simulation:

• RF engineers and antenna designers validating device emissions near the human body.
• Compliance and test laboratories using numerical SAR assessments as part of certification workflows.
• Device manufacturers documenting SAR for regulatory submission and internal design trade-offs.
• Simulation software developers implementing and verifying FDTD solvers against standardized benchmarks.
• Regulators and standards bodies seeking reproducible, traceable SAR simulation methods.

Practical uses include pre-compliance SAR estimation, model-based design iteration to reduce localized absorption, code verification for commercial FDTD tools, and documented uncertainty reporting required by regulatory frameworks.

Related Standards

• Exposure limits and health guidelines are referenced elsewhere, for example:
  • ICNIRP guidelines
  • IEEE Std C95.1
• IEC/IEEE 62704-1 complements measurement standards and device-specific SAR test methods by providing validated numerical methodology for SAR calculations.

Keywords: Spatial-Average Specific Absorption Rate, Finite-Difference Time-Domain, FDTD SAR, peak spatial-average SAR, human body SAR, SAR simulation uncertainty.