Analysis of Materials Effects on Radio Frequency Electromagnetic Fields in Human Head

Islam, Mohammad Tariqul; Abidin, Hafizah Zainool; Faruque, Mohammad Rashed Iqbal; Misran, Norbahiah

doi:10.2528/pier12030105

Cited by 27 publications

(19 citation statements)

References 33 publications

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“…It is known that, at the same incident E-field strength, electromagnetic energy absorption in objects is dictated by their dielectric parameters and by their geometry [2,24,25]. Techniques for determining complex permittivity dispersion of any materials exist [26]; based on this, we chose here a set of four liquids for the dosimetric approach.…”

Section: Dosimetric Validation Of the Tem Cellmentioning

confidence: 99%

Design and Validation of a Tem Cell Used for Radiofrequency Dosimetric Studies

Iftode¹,

Miclăuș²

2012

PIER

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Abstract-A Transverse Electromagnetic Mode (TEM) cell is an interesting option for studying the biological effects of radiofrequency radiation at reduced scale (in vitro studies).Controlled and well-characterized exposure conditions are essential for a conclusive investigation: the biological sample is exposed to a uniform incident electromagnetic wave and the dose of absorbed radiation is precisely determined and correlated with the effect. Unfortunately, experimental dosimetry is often unavailable or inapplicable, so that a precharacterized and validated experimental setup is most valuable. As such, the primary objective of the present work is to experimentally validate a computational model of a self-built TEM cell designed for bioelectromagnetic experiments in the 100 MHz-1 GHz frequency range. Validation is achieved by comparing the computed vs. measured values for three significant parameters: scattering parameters, incident electric field distribution, and absorbed power in a set of liquid samples. Successful validation and characterization is achieved by using CST Microwave Studio's finite integration technique (FIT), and respectively a network analyzer for the experimental setup. The secondary objective is a dosimetric study of four different liquid samples loaded in the cell. The absorption coefficient (AC) is used, assimilated to the specific absorption rate (SAR) of energy deposition in the entire sample volume. AC is shown to converge in experiment and simulation up to 800 MHz for all samples. AC doesn't depend directly on the samples' volume (despite greater volumes frequently showing higher absorption) but rather upon the internal field distribution, which in turn mostly depends on the frequency and on the dimensions of the liquid samples.

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Section: Dosimetric Validation Of the Tem Cellmentioning

confidence: 99%

Design and Validation of a Tem Cell Used for Radiofrequency Dosimetric Studies

Iftode¹,

Miclăuș²

2012

PIER

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“…The outer shell of the head had a fixed relative permittivity of 3.5 with an electrical conductivity of 0.0016 S/m in this simulation [6,47]. Table 2 shows the parameters of the head simulating liquid (HSL) used for both of the GSM frequency ranges used.…”

Section: Head Modelsmentioning

confidence: 99%

“…The specific anthropomorphic mannequin (SAM) phantom head model, also called SAM, was provided by CST Microwave Studio (CST MWS) [30], which included the shell and liquid [44][45][46][47][48]. The outer shell of the head had a fixed relative permittivity of 3.5 with an electrical conductivity of 0.0016 S/m in this simulation [6,47].…”

Section: Head Modelsmentioning

confidence: 99%

The Influence of Human Head Model Wearing Metal-Frame Spectacles to the Changes of Sar and Antenna Gain: Simulation of Frontal Face Exposure

Mat¹,

Malek²,

Whittow³

et al. 2013

PIER

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Abstract-The relationship between specific absorption rate (SAR) and antenna gain inside the head due to the metal-frame spectacles was investigated. The radio frequency (RF) energy source considered is the smartphone used in the frontal face. A computer simulation using CST Microwave Studio 2012 was used for the investigation. Two sets of dipole antennas operated at 900 MHz and 1800 MHz for GSM applications, were used as representative radiation sources from a mobile phone. Parametric studies were conducted to determine the optimum length of the metal rod, and the length was used to study the possibility of RF irradiation of the metal spectacles model. Then, the spectacles model was used as an analysis tool to study the interaction between gain and SAR in the head. The radiation pattern was plotted to identify the causes of the interactions. The gain decreased when the energy source was very close to the spectacles and SAR increased enormously.

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“…Interaction of radiofrequency (RF) in the human body has been reported in several research articles [1][2][3][4][5][6][7][8][9][10]. In this paper, plano-convex lens like behaviour is investigated for a pregnant woman abdomen for non ionizing microwave radiation.…”

Section: Introductionmentioning

confidence: 99%

Quasi Optical Effects of Non-Ionizing Radiation Inside Pregnant Woman Abdomen

Ali¹,

Ray²

2014

PIER M

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Abstract-Investigations have been carried out on the convex lens effect of non-ionizing radiation inside the abdomen of a pregnant woman. Focusing property for a plano-convex lens, which is thicker than twice of its focal length and filled with water, is studied for electric and magnetic fields at different microwave frequencies. It is observed that real image of electromagnetic fields are formed inside the lens itself at the focal plane when a microwave source is placed at a distance much greater than the twice the focal length. A three dimensional homogeneous electrical model of pregnant woman abdomen model behaves like plano-convex lens and creates real image of the microwave source inside the abdomen.

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Analysis of Materials Effects on Radio Frequency Electromagnetic Fields in Human Head

Cited by 27 publications

References 33 publications

Design and Validation of a Tem Cell Used for Radiofrequency Dosimetric Studies

Design and Validation of a Tem Cell Used for Radiofrequency Dosimetric Studies

The Influence of Human Head Model Wearing Metal-Frame Spectacles to the Changes of Sar and Antenna Gain: Simulation of Frontal Face Exposure

Quasi Optical Effects of Non-Ionizing Radiation Inside Pregnant Woman Abdomen

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