Recent Advancements in Dosimetry Measurements and Modeling

Mason, Patrick A.; Ziriax, John M.; Hurt, W. D.; Walters, Thomas J.; Ryan, Kathy L.; Nelson, David A.; Smith, Kelsey; D'Andrea, John A.

doi:10.1007/978-94-011-4191-8_18

Cited by 32 publications

(23 citation statements)

References 34 publications

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“…Peak value of maximum local 1-g SAR is 0.135 W/kg. Fluctuation in SAR value ensures hot spots with high energy absorption [32,33].…”

Section: E-fieldmentioning

confidence: 99%

Study of Em Wave Absorption and Shielding Characteristics for a Bonsai Tree for GSM-900 Band

Ali¹,

Ray²

2014

PIER C

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Abstract-Electromagnetic (EM) wave absorption characteristics for a Bonsai tree are investigated at GSM-900 band. Finite Difference in Time Domain (FDTD) method is hybridized with Friis transmission equation to carry out all the required EM simulations. The tree has been modelled using CT scan based 3D dataset considering different electrical parameters. Maximum local electric (E) field, magnetic (H) field, Specific Absorption Rate (SAR) and Shielding Effectiveness (SE) have been calculated for the tree placing at distance of 5 m away from a radiating Base Station Antenna (BSA) with 20 W input power. The maximum local E field, H field, 1-g SAR and SE obtained by the simulation are found to be 70.1 V/m, 0.09 A/m, 0.135 W/kg and 13.18 dB, respectively. Plants are found to be good natural electromagnetic radiation shield.

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“…Peak value of maximum local 1-g SAR is 0.135 W/kg. Fluctuation in SAR value ensures hot spots with high energy absorption [32,33].…”

Section: E-fieldmentioning

confidence: 99%

Study of Em Wave Absorption and Shielding Characteristics for a Bonsai Tree for GSM-900 Band

Ali¹,

Ray²

2014

PIER C

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“…These spheres were constructed so they could be quickly split apart after an exposure and scanned to visualize the surface temperatures (see IR thermography below). Care was taken to ensure that the surfaces of the split had good electrical contact during the exposure [Mason et al, 2000b].…”

Section: Spherementioning

confidence: 99%

Empirical validation of SAR values predicted by FDTD modeling*†

Gajšek¹,

Walters²,

Hurt³

et al. 2001

Bioelectromagnetics

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Rapid increase in the use of numerical techniques to predict current density or specific absorption rate (SAR) in sophisticated three dimensional anatomical computer models of man and animals has resulted in the need to understand how numerical solutions of the complex electrodynamics equations match with empirical measurements. This aspect is particularly important because different numerical codes and computer models are used in research settings as a guide in designing clinical devices, telecommunication systems, and safety standards. To ensure compliance with safety guidelines during equipment design, manufacturing and maintenance, realistic and accurate models could be used as a bridge between empirical data and actual exposure conditions. Before these tools are transitioned into the hands of health safety officers and system designers, their accuracy and limitations must be verified under a variety of exposure conditions using available analytical and empirical dosimetry techniques. In this paper, empirical validation of SAR values predicted by finite difference time domain (FDTD) numerical code on sphere and rat is presented. The results of this study show a good agreement between empirical and theoretical methods and, thus, offer a relatively high confidence in SAR predictions obtained from digital anatomical models based on the FDTD numerical code.

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“…Many techniques have been developed to improve the impedance bandwidth of monopole antennas. A shorting pin was added in [1], a bevel and a shorting pin were used in [2], a radiator with a dielectric slab was suggested in [3], and parasitic elements and slots were used in [4]. However, the probe-fed antennas suggested in [1][2][3] were not suitable for integration with printed circuit board…”

Section: Introductionmentioning

confidence: 99%

“…The evaluation of the power deposition induced inside the user's head by a hand-held device is a key issue for the design of cellular phones, compliance testing, and the study of possible effects of EM fields on humans. This issue can be efficiently addressed by modeling the phone using the finitedifference time-domain (FDTD) method [1], and by using accurate voxel models of the human head [2].…”

Section: Introductionmentioning

confidence: 99%