Prediction of the Sar Level Induced in a Dielectric Sphere by a Thin Wire Dipole Antenna

Abstract

Abstract-The interaction between a dipole antenna, representing a simplified model of a mobile terminal, and a homogeneous spherical model of the human head is examined. The Finite Difference Time Domain (FDTD) method is utilized, to calculate the either peak or average value of the Specific Absorption Rate (SAR), corresponding to different distances between antenna and phantom. The variation of the SAR with the distance between the mobile antenna and the human phantom has gained significant attention in the recent literature and is investigated here. An attempt to correlate the computed SAR values with the basic antenna characteristics, such as the standing wave ratio (SWR), reveals that a precise estimation of the level of the SAR can be achieved regarding data acquired from the mobile terminal.

Mri Induced Heating of Deep Brain Stimulation Leads: Effect of the Air-Tissue Interface

“…These are very high localized SAR values and are much greater than the SAR values produced inside head tissue due to mobile phones where the spatial peak values do not exceed 55 W/kg [15][16][17][18]. The quantity (1/2)σE · E * is integrated over the cylindrical volume 0 < r < 1 cm, −2 cm < τ < 1 cm for P 1 , and over 0 < r < 0.5 cm, −1 cm < τ < 0.5 cm for P 2 .…”

Reduction of Peak Sar in Human Head for Handset Applications With Resistive Sheets (R-Cards)

“…Over the years, lots of attentions have been paid to the analysis of SAR in human head due to the complexity and large scale involved in this kind of problems [6][7][8][9][10][11]. Recently, research efforts have been devoted to the reduction of peak SAR in human head for handset applications.…”

Design Analysis of Ferrite Sheet Attachment for Sar Reduction in Human Head

“…So there is a need to reduce an effort for reducing the spatial peak SAR in the design stage of phone model because the possibility of a spatial peak SAR exceeding the recommended exposure limit cannot be completely ruled out [2,3]. The interaction of the cellular handset with the human head has been investigated by many published papers with considering; first, the effect of the human head on the handset antenna performance, including the feed-point impedance, gain, and efficiency [4][5][6][7][8], second, the impact of the antenna EM radiation on the user's head due to the absorbed power, which is measured by predicting the induced SAR in the head tissue [7][8][9][10][11][12].…”