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TC34 Subcommittee 2: Computational Techniques

Chair: Dr. Wolfgang Kainz

The purpose of TC34 Subcommittee 2 is to specify numerical techniques and standardized models of the human anatomy used for determining the peak spatial average SAR (Specific Absorption Rate) in the human body of users for wireless communication devices. SAR is determined by applying computational techniques, like the Finite Difference Time Domain (FDTD), Finite Integrate Time Domain (FIT), or Finite Element Method (FEM), to compute the field conditions produced by wireless devices in anatomically correct models of the human anatomy or in a computer model of SAM (Specific Anthropomorphic Mannequin). Intended users of these practices will be (but will not be limited to) wireless communication device manufacturers and wireless service providers that are required to certify that their products comply with the applicable SAR limits, and government agencies.

TC34 Subcommittee 2 Working Group 1: Development of 1528.1

Chair: Dr. Andreas Christ

Working Group 1 develops the IEEE Std. 1528.1 for the numerical evaluation of the specific absorption rate for wireless devices operating in the frequency range between 30MHz and 6GHz using the FDTD and FIT algorithms. The objectives of IEEE Std. 1528.1 are 1) to define quality criteria for particular implementations of the numerical algorithm and 2) to give guidelines for the evaluation of the numerical uncertainty of the simulation results. Novel methods for the validation of the correct implementation of a numerical code and to assess its accuracy have been developed. These include, e.g., the evaluation of the numerical propagation constants in different dielectrics, of boundary conditions at planar and stair-cased material interfaces and of spurious reflection at absorbing boundary conditions. Post processing routines, such as the SAR averaging according to IEEE C95.3-2002, are validated with the help of particular benchmark geometries or reference results from alternative numerical methods. For the evaluation of the numerical uncertainty, different methods are proposed which permit the assessment of the impact of numerical contributions, e.g., the grid resolution, the power budget, etc. and the accuracy of the modeling, such as correct representation of the electrically relevant parts, dielectric parameters, etc.

TC34 Subcommittee 2 Working Group 2: Development of 1528.2

Chair: Dr. Giorgi Bit-Babik

Working Group 2 develops IEEE Std. 1528.2 for numerical compliance evaluation of mobile radio products with respect to applicable RF exposure compliance limits, e.g., IEEE C95.1-2005. The scope of this project includes the concepts, techniques, vehicle models, validation procedures, uncertainties and limitations of the Finite-Difference Time-Domain (FDTD) method when used for determining the peak spatial and whole body averaged specific absorption rate (SAR) in human bodies exposed to RF fields emitted from vehicle mounted antennas in the frequency range from 30 MHz to 6 GHz. It defines and recommends standardized vehicle CAD models and anatomical human body models of bystander and passenger and provides general benchmark data for these models. It further defines antenna locations, compliance configurations, exposure conditions, posture and positions of the standardized human body models in the vicinity and inside the vehicle and provides specific recommendations to perform exposure simulations with those models. This document will not recommend specific SAR values since these are found in other documents, e.g., ICNIRP Guidelines or IEEE Std. C95.1-2005.

TC34 Subcommittee 2 Working Group 3: Development of 1528.3

Chair: Dr. Vikass Monebhurrun

Working Group 3 develops IEEE Std. 1528.3 for numerical compliance evaluation of personal communication devices including mobile phones with respect to applicable RF exposure compliance limits, e.g. IEEE C95.1-2005 and ICNIRP Guidelines. The scope of this project includes the concepts, techniques, device models, validation procedures, uncertainties and limitations of the Finite-Difference Time-Domain (FDTD) method when used for determining the local peak spatial averaged specific absorption rate (SAR) in human bodies exposed to RF fields in the frequency range from 30 MHz to 6 GHz. The standard will give guidance on the usage of CAD models representing the device under test and procedures for positioning of the device at the human head and body models, as well as recommended procedures for grid generation, computer calculation and post-processing techniques. It further includes models for benchmark validation with reference data.

TC34 Subcommittee 2 Working Group 4: Development of 1528.4

Chair: Martin Vogel

Working Group 4 develops IEEE Std. 1528.4 for using the Finite-Element Method to determine the peak spatial average specific absorption rate (SAR) in standardized models of the human anatomy exposed to wireless communication devices, in particular vehicle-mounted antennas and personal wireless devices such as hand-held mobile phones. Guidance on modeling such devices and benchmark data for simulation will be provided. It will define model contents, guidance on meshing and test positions at the anatomical models. The document is developed in parallel with 1528.1, 1528.2 and 1528.3. It will differ from these mainly in the choice of computational method.