Temperature elevation in the human head due to handset antennas

• Project/Area Number: 18760271
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Communication/Network engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: HIRATA Akimasa Nagoya Institute of Technology, 大学院・工学研究科, 准教授 (00335374)
• Project Period (FY): 2006 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,580,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥180,000); Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2007: ¥1,200,000 (Direct Cost: ¥1,200,000); Fiscal Year 2006: ¥1,600,000 (Direct Cost: ¥1,600,000)
• Keywords: (E)マイクロ波 / ミリ波 / 電磁波と人体 / 比吸収率 / 温度上昇 / 次世代無線通信 / 詳細な人体頭部モデル / 時間領域差分法

Research Abstract

携帯電話などで用いられる電波の生体への影響は、温度上昇によるものが支配的であるとされている。本研究では、携帯電話用アンテナより放射される電波による吸収電力と温度上昇の解析を行った。対象とする周波数は、次世代携帯電話が用いられる周波数である3GHz-4GHzの周波数を含むものとした。本研究目的のために、温度上昇解析手法の効率化手法を開発するとともに、3次元簡易モデル(球状)を用いた基礎検討も行った。その結果、耳翼による影響も無視できないことを明らかにした。また、3GHz以下の周波数では、電波安全基準で用いられている指標である局所10g平均SARと温度上昇の相関は良好であることを碓認するとともに、更に高い周波数でも良好な指標となる可能性を示唆するものであった。

Research Products

• [Journal Article] On averaging mass of SAR correlating with temperature elevation due to a dipole antenna (2008)
  • Author(s): A. Hirata, K. Shirai, and O. Fujiwara
  • Journal Title: Progress in Electromagnetic Research vol.84 Pages: 221-237
• [Journal Article] On averaging mass of SAR correlating with temperature elevation dueto a dipole antenna (2008)
  • Author(s): A. Hirata, K. Shirai, and O. Fujiwara
  • Journal Title: Progress in Electromagnetic Research 84 Pages: 221-237
  • Peer Reviewed
• [Journal Article] Temperature elevation in the eye of Japanese male and female models for plane wave exposure (2007)
  • Author(s): A. Hirata, S. Watanabe, O. Fujiwara, M. Kojima, K. Sasaki, and T. Shiozawa
  • Journal Title: Physics in Medicine and Biology vol.52 Pages: 6389-6399
  • NAID: 10018406121
• [Journal Article] Temperature elevation in the eye of Japanese male and female models for plane wave exposure (2007)
  • Author(s): A. Hirata, S. Watanabe, O. Fujiwara, M. Kojima, K. Sasaki, and T. Shiozawa
  • Journal Title: Physics in Medicine and Biology 52 Pages: 6389-6399
  • NAID: 10018406121
  • Peer Reviewed
• [Journal Article] FDTD-derived correlation of maximum temperature increase and peak SAR in child and adult head models due to dipole antenna (2006)
  • Author(s): M. Fujimoto, A. Hirata, J. Wang, O. Fujiwara, and T. Shiozawa
  • Journal Title: IEEE Transactions on Electromagnetic Compatibility vol.48, no.1 Pages: 240-247
• [Journal Article] Correlation between peak spatial-average SAR and temperature increase due to antennas attached to human trunk (2006)
  • Author(s): A. Hirata, O. Fujiwara, and T. Shiozawa
  • Journal Title: IEEE Transactions on Biomedical Engineering vol.53, no.8 Pages: 1658-1664
• [Presentation] マイクロ波曝露の人体に対する深部温度上昇の簡易推定式 (2008)
  • Author(s): 杉山裕紀, 平田晃正, 藤原修
  • Organizer: 電子情報通信学会ソサイエティ大会
  • Place of Presentation: 明治大学
  • Year and Date: 2008-09-18
• [Presentation] FDTD computation of temperature elevation in human body for RFfar-field exposure (2008)
  • Author(s): A. Hirata, T. Asano, and O. Fujiwara
  • Organizer: Annual International Conference of the IEEE Eugineering in Medicine and Biology
  • Place of Presentation: バンクーバー
  • Year and Date: 2008-08-23
• [Presentation] Thermal dosimetry in human for microwave exposures (2008)
  • Author(s): A. Hirata and O. Fujiwara
  • Organizer: Proceedings of URSI General Assembly
  • Place of Presentation: シカゴ
  • Year and Date: 2008-08-15
• [Presentation] Effect of SAR Average Mass on Correlation with Temperature Elevation in Japanese Head Model (2008)
  • Author(s): A. Hirata, K. Shirai, and O Fujiwara
  • Organizer: Asia-Pacific Conference on EMC
  • Place of Presentation: シンガポール
  • Year and Date: 2008-05-20
• [Presentation] Thermal dosimetry in human for microwave exposures (2008)
  • Author(s): A. Hirata and O. Fujiwara
  • Organizer: Proceedings of URSI General Assembly
  • Place of Presentation: Chicago, USA
• [Presentation] Influence of Average Mass of SAR on the Correlation with Temperature Elevation Due to a Dipole Antenna (2008)
  • Author(s): A. Hirata, K. Shirai, and O. Fujiwara
  • Organizer: 電子情報通信学会 環境電磁工学研究会
  • Place of Presentation: 佐賀大学
• [Presentation] Relationship between temperature elevation and spatial average SAR in Japanese human head model due to dipole antenna (2007)
  • Author(s): A. Hirata, K. Shirai, and O. Fujiwara
  • Organizer: Proceedings of IEEE International Symposium on Electromagnetic Compatibility, TUPM41
  • Place of Presentation: Honolulu, Hawaii
• [Presentation] Relationship between temperature elevation and spatial average SAR in Japanese human head model due to dipole antenna (2007)
  • Author(s): A. Hirata, K. Shirai, and O. Fujiwara
  • Organizer: IEEE International Symposium on Electromagnetic Compatibility
  • Place of Presentation: アメリカ・ホノルル