When using a transmit array at high field, it is well established that high local specific absorption rate (SAR) values can occur [1]. In order to guarantee patient safety without harsh limitations to in-vivo transmit-SENSE [2] applications, subtle SAR monitoring is therefore necessary. In the recent past, a comprehensive solution involving pre-calculated B1-field-maps and local pickup-coils wa...

The finite difference time domain method is used to calculate the specific absorption rate (SAR) due to a butterfly surface coil in a realistic tissue model of the leg. The resulting temperature distribution and temperature changes are found using a finite difference solution to the bioheat transfer equation. Reasonable agreement is found between predicted temperature changes and those measured...

The Finite-Difference Time-Domain (FDTD) method is used to calculate the cellular phone far and near field and the specific absorption rate (SAR) in the user’s head. The conventional λ/4 monopole and a simple planar antenna are simulated and measured. The simulated results are in good agreement with those measured for the VSWR and for the radiation patterns on the horizontal and vertical planes...

Received Feb 26, 2017 Revised Apr 28, 2017 Accepted May 16, 2017 In this work, the antenna performance and Specific Absorption Rate (SAR) levels in a homogeneous phantom exposed to 900 MHz flexible diamond dipole antenna are investigated under different crumpling deformation conditions. The numerical simulations of the realistic complex two dimensional crumpling are performed by using Finite In...

This paper presents an efficient implementation of different techniques used in the computation of averaged Specific Absorption Rate (SAR). The main purpose of this work is to enhance the accuracy and speed in the prediction of SAR averaged values regarding highly detailed human models, which present a highly inhomogeneous medium. Following the recommendations of IEEE and ICNIRP standards, thre...

In this paper, a new four element rectangular dielectric resonator antenna (RDRA) for 5.0 GHzWLAN/WiMAX band is proposed. The simulation results for its radiation characteristics and the specific absorption rate (SAR) distribution in a homogenous bio-medium (muscle layer) for different antenna-to-muscle layer spacings are presented at different frequencies in 4.9–5.9 GHz band. The input charact...

A method to reduce the specific absorption rate(SAR) of the antenna for WiMAX mobile communication is proposed in this paper. The SAR reduction is achieved by miniaturizing the physical size of the antenna for the given resonance frequency by devising a metamaterial-composite rightand left-handed(CRLH) configuration-based radiator much smaller than the quarter-guided wavelength adopted a lot in...

This study investigates the radiation safety of a newly designed magnetic induction sensor. This novel magnetic induction sensor uses a two-arm Archimedean spiral coil (TAASC) as the exciter. A human head model with a real anatomical structure was used to calculate the specific absorption rate (SAR) and temperature change. Computer Simulation Technology (CST) was used to determine the values of...

In this study, a double-negative triangular metamaterial (TMM) structure, which exhibits a resounding electric response at microwave frequency, was developed by etching two concentric triangular rings of conducting materials. A finite-difference time-domain method in conjunction with the lossy-Drude model was used in this study. Simulations were performed using the CST Microwave Studio. The spe...

Exposure to radio frequency electromagnetic fields has raised scientific and public concern regarding possible adverse effects to people exposed to such radiation. At cellular mobile communication frequencies, the most important parameter used to assess human exposure to electromagnetic fields is SAR (Specific Absorption Rate). This paper will firstly address two exposure scenarios related to a...