Specific Absorbtion Rate (SAR) Simulation using Feko

Mahan Rudd_22044
Mahan Rudd_22044
Altair Employee
edited September 2023 in Altair HyperWorks

Introduction

Specific absorption rate (SAR) is a measure of the rate at which the RF energy is absorbed by the human body tissue. This is an indication of the heating effect that can be caused by the high frequency electromagnetic fields. SAR limits and regulations vary among different regions in the world. Two commonly used limits for handheld devices used in the close proximity of the human head are 1.6 W/kg (averaged over 1 gram of tissue) and 2 W/kg (averaged over 10 gram of tissue) in north America and EU region, respectively. Knowing the exact field distribution is essential for calculating the SAR value.

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Altair Feko

Altair Feko is a comprehensive 3D electromagnetic solver offering a range of different computational electromagnetic methods (CEM) to accurately solve the 3D electromagnetic environment and find the field distribution. Near-field request in Feko calculates the field values at specified points which are used by to determine the SAR value. SAR calculation can be done using Method of Moment (MoM) solver or Finite Element Method (FEM).

 

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Transmitting Antenna

Altair Feko is equipped with a library of different types of antennas that can be used as the transmitting antenna in a typical SAR calculation scenario. The antenna created using the component library is a fully parametric model and the user can modify the design if needed.

 

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Human Phantoms

The SAR measurement standards often require the SAR value to be determined in a realistic model. For the transmitters against the head the measurement standards (e.g., IEC 62209-1) requires the device to be positioned against the IEEE SAM head phantom (shown below). Altair provides a range of different human phantoms that can be used to represent human model for a realistic simulation.

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How to simulate SAR using Altair Feko

A step by step guide for simulating SAR using Altair Feko is explained in the video below. This includes all the steps involved in such a scenario, including using the antenna library to create the antenna model, importing the human head phantom, material definition, adding excitation and near-field requests and finally results visualization in POSTFEKO.

 


https://www.youtube.com/watch?v=TVur8zifttE

 

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Comments

  • Dilay Özsan
    Dilay Özsan Altair Community Member
    edited March 20

    Hello, first of all, congratulations on your work. I am an electrical and electronics engineering student, and my thesis topic is 'simulation of the effects of frequencies on the human brain'. I need the human phantom you used in the video. I would be very happy if you could share the 'SAR.nas' file with me. Thank you.

     
     
     
     
     
     

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