Propagation of Radio-Frequency Electromagnetic Fields Emitted by Surface-Mounted Parallel-Plate Couplers Along Human Limbs

IF 3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Arno Thielens
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引用次数: 0

Abstract

Wearables on human limbs commonly require wireless connections with other body-worn devices. These links can be established using radio-frequency electromagnetic fields emitted by parallel-plate capacitors (PPCs) as transducing elements. The propagation of the electric (E-) fields emitted by such PPCs on the surface of human limbs is studied by simulations with a stratified, lossy, dielectric cylinder as a limb model. In contrast to currently existing models, this analysis demonstrates that this propagation depends strongly on propagating modes within the lossy dielectric waveguide and that this is associated with an optimal frequency band of operation for such wireless links, which is tied to cut-off frequencies for propagation along the cylindrical waveguide and the radiation efficiency of the PPC, which is also dependent on the limb size. A channel-loss model in the 0.1–1 GHz frequency range is determined based on the simulations. This model is validated using channel loss measurements using a PPC placed on the limbs of three human subjects.
表面安装平行板耦合器发射的射频电磁场沿人体四肢的传播
人类四肢上的可穿戴设备通常需要与其他身体穿戴设备进行无线连接。这些链接可以使用由并联板电容器(PPCs)发射的射频电磁场作为换能器来建立。采用分层有损介质圆柱体作为肢体模型,模拟研究了这些PPCs发出的电场在人体肢体表面的传播。与目前现有的模型相比,该分析表明,这种传播强烈依赖于损耗介质波导内的传播模式,并且这与这种无线链路的最佳操作频带有关,该频带与沿圆柱形波导传播的截止频率和PPC的辐射效率有关,这也取决于边的大小。在此基础上,确定了0.1 - 1ghz频率范围内的信道损耗模型。该模型使用放置在三个人类受试者四肢上的PPC通道损耗测量进行验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
9.40%
发文量
58
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