ANALYSIS OF THE WHOLE-BODY AVERAGED SPECIFIC ABSORPTION RATE (SAR) FOR FAR-FIELD EXPOSURE OF AN ISOLATED HUMAN BODY USING CYLINDRICAL ANTENNA THEORY

2014 ◽  
Vol 38 ◽  
pp. 103-112 ◽  
Author(s):  
Behailu Kibret ◽  
Assefa K. Teshome ◽  
Daniel T. H. Lai
Keyword(s):  
Human Body ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Whole Body ◽  
Far Field ◽  
Field Exposure ◽  
Specific Absorption ◽  
Antenna Theory ◽  
Cylindrical Antenna

EVALUATION OF SPECIFIC ABSORPTION RATE IN THE FAR-FIELD, NEAR-TO-FAR FIELD AND NEAR-FIELD REGIONS FOR INTEGRATIVE RADIOFREQUENCY EXPOSURE ASSESSMENT

2020 ◽  
Vol 190 (4) ◽  
pp. 459-472 ◽  
Author(s):  
Ilaria Liorni ◽  
Myles Capstick ◽  
Luuk van Wel ◽  
Joe Wiart ◽  
Wout Joseph ◽  
...  
Keyword(s):  
Large Scale ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Numerical Study ◽  
Whole Body ◽  
Single Frequency ◽  
Far Field ◽  
Specific Absorption ◽  
Rf Systems ◽  
Body Tissues

Abstract The specific absorption rate (SAR) induced by wireless radiofrequency (RF) systems depends on different parameters. Previously, SAR was mainly assessed under conditions of a single frequency and technology and for a limited number of localized RF sources. The current and emerging mobile systems involve a wider range of usage scenarios and are frequently used simultaneously, leading to combined exposures for which almost no exposure evaluation exists. The aim and novelty of this study is to close this gap of knowledge by developing new methods to rapidly evaluate the SAR induced by RF systems in such scenarios at frequencies from 50 MHz to 5.5 GHz. To this aim, analytical methods for SAR estimation in several usage scenarios were derived through a large-scale numerical study. These include subject-specific characteristics, properties of the RF systems and provide an estimation of the SAR in the whole body, tissues and organs, and different brain regions.

scholarly journals Measurement Analysis of Specific Absorption Rate in Human Body Exposed to a Base Station Antenna by Using Finite Difference Time Domain Techniques

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Hla Myo Tun ◽  
Khin Kyu Kyu Win ◽  
Zaw Min Naing ◽  
Devasis Pradhan ◽  
Prasanna Kumar Sahu
Keyword(s):  
Finite Difference ◽  
Human Body ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Base Station ◽  
Whole Body ◽  
Specific Absorption ◽  
Difference Time

The system analysis of specific absorption rate (SAR) in human body exposed to a base station antenna by using finite difference time domain techniques was presented in this research works. The objectives of this work are to evaluate the knowledge and awareness about SAR among human body and mobile base station. The paper investigates the electromagnetic wave absorption inside a human body. The human body has been identified using dataset based on 2D object considering different electrical parameters.The SAR convinced inside the human body model exposed to a radiating base station antenna (BSA) has been considered for multiple numbers of carrier frequencies and input power of 20 W/carrier at GSM 900 band.The distance (R) of human body from BSA is varied in the range of 0.1 m to 5.0 m. For the number of carrier frequency equal to one and R = 0.1 m,the concentrated value of whole-body average SAR obtained by FDTD technique is found to be 0.68 W/kg which decreases either with increase of R or decrease of number of carrier frequencies. Safety distance for general public is found to be 1.5 m for number of carrier frequencies equal to one.The performance accuracy of this analysis meets the high level condition by comparing with the relevant system development in recent time.

Variability of Specific Absorption Rate of Human Body for Various Configurations of Tablet Computer in Vicinity of Abdomen

2015 ◽  
Vol E98.B (7) ◽  
pp. 1173-1181 ◽  
Author(s):  
Akihiro TATENO ◽  
Tomoaki NAGAOKA ◽  
Kazuyuki SAITO ◽  
Soichi WATANABE ◽  
Masaharu TAKAHASHI ◽  
...  
Keyword(s):  
Human Body ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Tablet Computer ◽  
Specific Absorption

scholarly journals The specific absorption rate in different brain regions of rats exposed to electromagnetic plane waves

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hao-Yu Wang ◽  
Chun-Fang Li ◽  
Chao Yu ◽  
Ji Dong ◽  
Yong Zou ◽  
...  
Keyword(s):  
Brain Region ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Brain Regions ◽  
Dose Effect ◽  
Whole Body ◽  
Polarization Direction ◽  
Whole Brain ◽  
Specific Absorption ◽  
Effect Relationship

Abstract Accurate dosimetry of a specific brain region in rats exposed to an electromagnetic field (EMF) is essential for studies focusing on dose-effect relationship of the region. However, only dosimetry of whole brain or whole body were evaluated in most of previous studies. In this study, a numerical voxel rat model with 10 segmented brain regions was constructed. Then, the effects of frequency, incidence direction, and E-polarization direction of plane wave EMF on brain region averaged specific absorption rate (BRSAR) of rats were investigated. At last, the reliability of using whole-body averaged SAR (WBDSAR) and whole-brain averaged SAR (WBRSAR) as estimations of BRSAR were also evaluated. Our results demonstrated that the BRSAR depended on the frequency, incidence direction, and E-polarization direction of the EMF. Besides, the largest deviation could be up to 13.1 dB between BRSAR and WBDSAR and 9.59 dB between BRSAR and WBRSAR. The results suggested that to establish an accurate dose-effect relationship, the variance of the BRSAR induced by alteration of frequency, incidence direction, and E-polarization direction of EMF should be avoided or carefully evaluated. Furthermore, the use of WBDSAR and WBRSAR as estimations of BRSAR should be restricted to certain conditions such that the deviations are not too large.

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