FDTD Analysis of Electromagnetic Interaction between Portable Telephone and Human Head

• TAKI Masao

  the Faculty of Engineering, Tokyo Metropolitan University

• WATANABE So-ichi

  the Faculty of Engineering, Tokyo Metropolitan University

• NOJIMA Toshio

  the NTT Mobile Communications Network Inc

抄録

Finite-difference time-domain (FDTD) analysis is performed to evaluate the distributions of specific absorption rate (SAR) in a human head during use of a handheld portable telephone. A heterogeneous head model has been assumed which is comprised of 273 108 cubic cells 2.5 mm on a side, with the electrical properties of anatomical equivalents. A handset model has been assumed to be a metal box with either a quarter-wavelength monopole or a half-wavelength dipole operating at 900MHz or l.5 GHz. The maximum local SARs in the head are evaluated under various exposure conditions. The dependence of the maximum local SARs on the difference in the structures or parameters of the model, i. e. the distance between the antenna and the head, the heterogeneity of the head, the antenna type, the volume of the smoothing region of the local SAR value, skin electrical constants, and the presence or absence of auricles, are examined.It is shown that the heterogeneity of the head barely affect the maximum Iocal SAR when the telephone is located sufficiently close to the head. It is also shown that the electrical constants of skin which has lower conductivity provide the lower maximum local SAR in the head while the maximum local SAR within the brain is not significantly affected. The auricle which lies in closest proximity to the antenna is shown to have significant effect on the maximum local SAR. It is suggested that the presence of the auricle enhances the maximum local SAR by a factor that is 1.7-2.4 larger than the model without auricles.

収録刊行物

• IEICE transactions on electronics

  IEICE transactions on electronics 79 (10), 1300-1307, 1996-10-25

  一般社団法人電子情報通信学会

キーワード

• near-feld exposure
• biological effect
• specific absorption rate
• FDTD method
• cellular telephone

詳細情報

• CRID: 1571417127295305856
• NII論文ID: 110003220512
• NII書誌ID: AA10826283
• ISSN: 09168524
• 本文言語コード: en
• データソース種別:
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