Specific Absorption Rates and Temperature Elevations due to Wireless Radio Terminals in Proximity to a Fetus at Gestational Ages of 13, 18, and 26 Weeks

• TATENO Akihiro

  Graduate School of Engineering, Chiba University

• AKIMOTO Shimpei

  Information Technology R&D Center, Mitsubishi Electric Corporation

• NAGAOKA Tomoaki

  Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology

• SAITO Kazuyuki

  Center for Frontier Medical Engineering, Chiba University

• WATANABE Soichi

  Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology

• TAKAHASHI Masaharu

  Center for Frontier Medical Engineering, Chiba University

• ITO Koichi

  Center for Frontier Medical Engineering, Chiba University

抄録

As the electromagnetic (EM) environment is becoming increasingly diverse, it is essential to estimate specific absorption rates (SARs) and temperature elevations of pregnant females and their fetuses under various exposure situations. This study presents calculated SARs and temperature elevations in a fetus exposed to EM waves. The calculations involved numerical models for the anatomical structures of a pregnant Japanese woman at gestational stages of 13, 18, and 26 weeks; the EM source was a wireless portable terminal placed close to the abdomen of the pregnant female model. The results indicate that fetal SARs and temperature elevations are closely related to the position of the fetus relative to the EM source. We also found that, although the fetal SAR caused by a half-wavelength dipole antenna is sometimes comparable to or slightly more than the International Commission Non-Ionizing Radiation Protection guidelines, it is lower than the guideline level in more realistic situations, such as when a planar inverted-F antenna is used. Furthermore, temperature elevations were significantly below the threshold set to prevent the child from being born with developmental disabilities.

収録刊行物

• IEICE Transactions on Communications

  IEICE Transactions on Communications E97.B (10), 2175-2183, 2014

  一般社団法人 電子情報通信学会

キーワード

• fetus
• specific absorption rate (SAR)
• temperature elevation
• wireless radio terminals
• finite-difference time-domain (FDTD) method

詳細情報

• CRID: 1390001204375446912
• NII論文ID: 130004696695
• DOI: 10.1587/transcom.e97.b.2175
• ISSN: 17451345
• ISSN: 09168516
• Web Site: https://www.jstage.jst.go.jp/article/transcom/E97.B/10/E97.B_2175/_pdf
• 本文言語コード: en
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