ON AVERAGING MASS OF SAR CORRELATING WITH TEMPERATURE ELEVATION DUE TO A DIPOLE ANTENNA
ON AVERAGING MASS OF SAR CORRELATING WITH TEMPERATURE ELEVATION DUE TO A DIPOLE ANTENNA
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DOI：
10.2528/pier08072704
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发表时间：
2008-01-01
影响因子：
6.7
通讯作者：
Fujiwara, O.
中科院分区：
文献类型：
--
作者：
Hirata, A.;Shirai, K.;Fujiwara, O.
本研究调查了温度升高和空间平均SAR（特定吸收率）在一个日本男性的头部模型，由于偶极天线之间的关系。所考虑的频率在无线通信中使用的800 MHz和3 GHz之间的范围内。我们的注意力集中在SAR的平均质量，最大限度地提高与当地温度升高的相关性。计算结果表明，在较宽的频率范围内，SAR的平均质量并不存在，这是由于电磁波的穿透深度依赖于频率。对于本研究中考虑的大多数情况，从与温度升高相关的角度来看，10 g以上的SAR平均值优于1 g。影响该平均质量的主要因素是热扩散长度，其在很大程度上取决于血液灌注速率。此外，在羽片的热演化空间平均SAR和温度升高之间的相关性发挥了重要作用。
This study investigated the relationship between temperature elevation and spatial-average SAR (specific absorption rate) in a head model of a Japanese male due to a dipole antenna. The frequencies considered are in the range between 800 MHz and 3 GHz, which are used in wireless communications. Our attention focuses on the average mass of SAR which maximizes the correlation with local temperature elevation. Computational results suggested that an appropriate averaging mass of SAR did not exist over wide frequencies, which was attributed to the frequency-dependent penetration depth of electromagnetic waves. For most cases considered in this study the SAR averaging over 10 g was better than that for 1-g from the standpoint of correlating the temperature elevation. The dominant factor influencing this averaging mass is the thermal diffusion length which largely depends on the blood perfusion rate. Additionally, the heat evolved in the pinna played an important role in the correlation between spatial-average SAR and temperature elevation.