Effects of electromagnetic absorption toward a human head due to variation of its dielectric properties at 900 and 1900 MHz with different antenna substrates

Nur Aisyah Husni, Mohammad Rashed Iqbal Faruque, Mohammad Tariqul Islam, Norbahiah Misran, Nik Abdullah Nik Mohamed

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The aim of this paper is to analyze the effects of electromagnetic (EM) energy absorption at 900 and 1900 MHz when the human head ' s dielectric properties are varied. This radiation is measured in terms of specific absorption rate (SAR). The characteristics of the helical antenna and its substrates with variation of the human head dielectric properties were simulated via the finite-difference time domain (FDTD) method using the CST Microwave studio. The human head dielectric properties are manipulated by increasing and decreasing 10 % and 20 % of each dielectric property. In this study, SAR values increase with increase of the human head ' s conductivity, while increase of permittivity and densities decreases it. A helical antenna with a substrate of FR4 resulted in higher SAR values in all frequencies. The head SAR values are higher in the upper frequency exposures. The helical antenna with a substrate of Rogers RO3006 (loss free) was found to be the best-tested substrate, which contributed toward much lower SAR values in all GSM frequency bands.

Original languageEnglish
Pages (from-to)271-277
Number of pages7
JournalScience and Engineering of Composite Materials
Volume19
Issue number3
DOIs
Publication statusPublished - 2012

Fingerprint

Electromagnetic wave absorption
Helical antennas
Dielectric properties
Antennas
Substrates
Finite difference time domain method
Studios
Energy absorption
Global system for mobile communications
Electromagnetic waves
Frequency bands
Permittivity
Microwaves
Radiation

Keywords

  • Different substrate materials
  • Finite-difference time domain (FDTD) method
  • Ingestible wireless device (IWD)
  • Specific absorption rate (SAR)

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "The aim of this paper is to analyze the effects of electromagnetic (EM) energy absorption at 900 and 1900 MHz when the human head ' s dielectric properties are varied. This radiation is measured in terms of specific absorption rate (SAR). The characteristics of the helical antenna and its substrates with variation of the human head dielectric properties were simulated via the finite-difference time domain (FDTD) method using the CST Microwave studio. The human head dielectric properties are manipulated by increasing and decreasing 10 {\%} and 20 {\%} of each dielectric property. In this study, SAR values increase with increase of the human head ' s conductivity, while increase of permittivity and densities decreases it. A helical antenna with a substrate of FR4 resulted in higher SAR values in all frequencies. The head SAR values are higher in the upper frequency exposures. The helical antenna with a substrate of Rogers RO3006 (loss free) was found to be the best-tested substrate, which contributed toward much lower SAR values in all GSM frequency bands.",
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AU - Husni, Nur Aisyah

AU - Faruque, Mohammad Rashed Iqbal

AU - Islam, Mohammad Tariqul

AU - Misran, Norbahiah

AU - Mohamed, Nik Abdullah Nik

PY - 2012

Y1 - 2012

N2 - The aim of this paper is to analyze the effects of electromagnetic (EM) energy absorption at 900 and 1900 MHz when the human head ' s dielectric properties are varied. This radiation is measured in terms of specific absorption rate (SAR). The characteristics of the helical antenna and its substrates with variation of the human head dielectric properties were simulated via the finite-difference time domain (FDTD) method using the CST Microwave studio. The human head dielectric properties are manipulated by increasing and decreasing 10 % and 20 % of each dielectric property. In this study, SAR values increase with increase of the human head ' s conductivity, while increase of permittivity and densities decreases it. A helical antenna with a substrate of FR4 resulted in higher SAR values in all frequencies. The head SAR values are higher in the upper frequency exposures. The helical antenna with a substrate of Rogers RO3006 (loss free) was found to be the best-tested substrate, which contributed toward much lower SAR values in all GSM frequency bands.

AB - The aim of this paper is to analyze the effects of electromagnetic (EM) energy absorption at 900 and 1900 MHz when the human head ' s dielectric properties are varied. This radiation is measured in terms of specific absorption rate (SAR). The characteristics of the helical antenna and its substrates with variation of the human head dielectric properties were simulated via the finite-difference time domain (FDTD) method using the CST Microwave studio. The human head dielectric properties are manipulated by increasing and decreasing 10 % and 20 % of each dielectric property. In this study, SAR values increase with increase of the human head ' s conductivity, while increase of permittivity and densities decreases it. A helical antenna with a substrate of FR4 resulted in higher SAR values in all frequencies. The head SAR values are higher in the upper frequency exposures. The helical antenna with a substrate of Rogers RO3006 (loss free) was found to be the best-tested substrate, which contributed toward much lower SAR values in all GSM frequency bands.

KW - Different substrate materials

KW - Finite-difference time domain (FDTD) method

KW - Ingestible wireless device (IWD)

KW - Specific absorption rate (SAR)

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