Human equivalent antenna model for transient electromagnetic radiation exposure

Poljak, Dragan; Tham, Choy Yoong; Gandhi, O.P.; Šarolić, Antonio

doi:10.1109/temc.2002.808042

Cited by 25 publications

(24 citation statements)

References 9 publications

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“…The suitability of the applied numerical solution methods is then related to the highly heterogeneous electrical properties of the body and the complexity of the external and internal geometry. The numerical methods for LF exposure scenarios range from simple canonical models, e.g., [16], [17], robust finite difference scheme, e.g., [18], [19], which are ideally suited for simulations of high-resolution inhomogeneous models, but limited to scenarios where the wavelength is not too big compared to the resolution, to the approaches suitable for adaptive conformal meshes, such as finite-element method (FEM), e.g., [20], [21] or boundary-element method (BEM), e.g., [22], [23]. It should be noted that the numerical method is not necessarily fixing the discretization approach.…”

Section: Introductionmentioning

confidence: 99%

On the Use of Conformal Models and Methods in Dosimetry for Nonuniform Field Exposure

Poljak

Cvetković

Bottauscio

et al. 2018

IEEE Trans. Electromagn. Compat.

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Abstract-Numerical artifacts affect the reliability of computational dosimetry of human exposure to low-frequency electromagnetic fields. In the guidelines of the International Commission of Non-Ionizing Radiation Protection, a reduction factor of 3 was considered to take into account numerical uncertainties when determining the limit values for human exposure. However, the rationale for this value is unsure. The IEEE International Committee on Electromagnetic Safety has published a research agenda to resolve numerical uncertainties in low-frequency dosimetry. For this purpose, intercomparison of results computed using different methods by different research groups is important. In previous intercomparison studies for low-frequency exposures, only a few computational methods were used, and the computational scenario was limited to a uniform magnetic field exposure. This study presents an application of various numerical techniques used: different finite-element method (FEM) schemes, method of moments, and boundary-element method (BEM) variants, and, finally, by using a hybrid FEM/BEM approach. As a computational example, the induced electric field in the brain by the coil used in transcranial magnetic stimulation is investigated. Intercomparison of the computational results is presented qualitatively. Some remarks are given for the effectiveness and limitations of application of the various computational methods.

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Section: Introductionmentioning

confidence: 99%

On the Use of Conformal Models and Methods in Dosimetry for Nonuniform Field Exposure

Poljak

Cvetković

Bottauscio

et al. 2018

IEEE Trans. Electromagn. Compat.

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“…The current density induced in the body can be expressed in terms of the axial current I z as follows [13]:…”

Section: Human Exposure To High-frequency (Hf) Radiationmentioning

confidence: 99%

Assessment of the human exposure to transient and time-harmonic fields using the enhanced transmission line theory approach

et al. 2017

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The paper deals with the assessment of human exposure to the transient electromagnetic fields and high-frequency (HF) radiation. The formulation of the problem is based on a simplified cylindrical representation of the human body. The analysis is based on the enhanced transmission line (TL) theory. For this purpose, in order to quantify the induced current inside the human body, we solve linear system equations, where the electromagnetic field excitation is represented by two equivalent current and voltage generators. Once the axial current is determined, it is possible to calculate the specific absorption rate (SAR). Some illustrative computational examples are presented in the paper.

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“…In 2003, Poljak et al developed a human equivalent antenna model for transient electromagnetic exposure. They used thick cylindrical antennas to represent the human body and thin-wire approximation to evaluate the current induced in human body for a body exposed to a pulsed radiation between 50 Hz and 110 MHz [7]. Recently Kibret et al characterized the human body as a monopole antenna from 10 MHz to 110 MHz [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of currents induced in human body by plane wave exposure at 1–90 MHz

Frère

Alcaras

Lemoine

et al. 2017

2017 11th European Conference on Antennas and Propagation (EUCAP)

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Abstract-In existing exposure standards and guidelines the relationship between dosimetric quantities at a given frequency is not always consistent as some simultaneously applied limits are more restrictive than others, e.g. limits on induced currents compared to those on external electric field or specific absorption rate (SAR). To evaluate the current induced in the human body in 1 -90 MHz range, we propose an equivalent circuit composed of two elements: the first one provides the voltage at human body mid-height and the second one describes the equivalent human body impedance. Then, assuming that the human body is equivalent to an antenna between 1 and 90 MHz, we calculate induced currents at the human body height. Using the relationship between external electric field and voltage at the body mid-height, we calculate the current along the body and suggest updated limits on induced currents more consistent with the external electric field limits.

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Human equivalent antenna model for transient electromagnetic radiation exposure

Cited by 25 publications

References 9 publications

On the Use of Conformal Models and Methods in Dosimetry for Nonuniform Field Exposure

On the Use of Conformal Models and Methods in Dosimetry for Nonuniform Field Exposure

Assessment of the human exposure to transient and time-harmonic fields using the enhanced transmission line theory approach

Evaluation of currents induced in human body by plane wave exposure at 1–90 MHz

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