SAR distributions for 915 MHz interstitial microwave antennas used in hyperthermia for cancer therapy.
SAR distributions for 915 MHz interstitial microwave antennas used in hyperthermia for cancer therapy.
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用于癌症热疗的 915 MHz 间隙微波天线的 SAR 分布。
DOI：
10.1109/10.7292
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
Strohbehn,JW
中科院分区：
文献类型：
--
作者：
Jones,KM;Mechling,JA;Trembly,BS;Strohbehn,JW
给出了肌肉模型中工作频率为 915 MHz 的单绝缘天线的理论和实验比吸收率 (SAR) 分布； SAR 是根据测量的温升推导出来的。结果表明，长度比谐振长度短得多的偶极子具有比谐振偶极子大得多的无功输入阻抗分量和明显更小的绝对SAR幅度。所有调查的案例都表明，无论插入深度如何，最大 SAR 都出现在交界处附近。实验结果表明，与评估的其他天线设计相比，尖端部分等于四分之一波长且插入深度等于半波长的天线实现了纵向功率分布的大幅增加。<>
Theoretical and experimental specific absorption rate (SAR) distributions are presented for single insulated antennas operating at 915 MHz in muscle phantom; the SAR is deduced from measured temperature rise. Results show that dipoles with lengths much shorter than their resonant length have a characteristically large reactive input impedance component and a substantially smaller absolute SAR magnitude than resonant dipoles. All cases investigated demonstrate that the maximum SAR occurs near the junction, regardless of insertion depth. Experimental results show that an antenna with the tip section equal to a quarter-wavelength and the insertion depth equal to a half-wavelength achieves a substantial increase in the longitudinal power distribution compared to other antenna designs that were evaluated.<>