Abstract
In this paper, Specific Absorption Rates (SAR) inside the human head and hand have been analyzed for a handheld mobile phone operated at GSM 900 band. Both the head and hand are modeled electrically using Digital Imaging and Communication in Medicine (DICOM) formatted CT Scan voxel data considering the electrical parameters of different internal anatomical structures. Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to simulate SAR induced in the head and hand. Maximum peak 1-g and 10-g SARs of 1.33 W/kg and 0.388 W/kg are found at antenna resonance frequency of 930 MHz for 0.6 W applied input power which are below the limits set by ANSI/IEEE and FCC, respectively.
Highlights
The effect of non ionizing radiation on human health has become one of the common areas of interest for both technical and clinical researchers as a result of rapid growth in the use of mobile phones throughout the world
Variations of peak 1-g and 10-g Specific Absorption Rates (SAR) with distance D measured along Y-axis in the mid-coronal plane at 930 MHz obtained using CST Microwave Studio (MWS) are shown in Figs. 5 (a-b)
It is seen that maximum peak 1-g and 10-g SARs obtained in skin are 1.3238 W/kg and 0.3882 W/kg respectively
Summary
The effect of non ionizing radiation on human health has become one of the common areas of interest for both technical and clinical researchers as a result of rapid growth in the use of mobile phones throughout the world. Mobile phone users are exposed to significant amount of electromagnetic (EM) energy radiated from the transmitting antennas and directly or mutually coupled headsets and it is seen that absorption of EM waves in human head and other body parts causes adverse biological effects [1]-[5]. Actual phone with the equivalent homogeneous head or other body parts are used in the measurement, but these homogeneous models are not a faithful representation of the complex heterogeneous human organs because actual electrical properties of different tissues are not considered. Variation of peak 1-g and 10-g SARs with distance has been studied using threedimensional FDTD method for a realistic human head model including hand consisting of eleven types of tissues exposed to EM waves radiated from a mobile phone model designed for GSM 900 band (890 MHz – 960 MHz). Available FDTD based EM simulation software CST Microwave Studio (MWS) [23] is used to validate the performance of in-house FDTD code
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