Affiliations: [a] College of Computer Science, Neijiang Normal University, Neijiang, Sichuan, China | [b] Engineering and Technical College, Chengdu University of Technology, Leshan, Sichuan, China | [c] State Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macau, China | [d] Department of Electrical and Computer Engineering, Faculty of Science and Technology, University of Macau, Macau, China
Correspondence:
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Corresponding author: Yi-He Liu, College of Computer Science, Neijiang Normal University, Neijiang, Sichuan, China. E-mail: liu_yihe@163.com.
Note: [1] Authors contributed equally.
Abstract: BACKGROUND: This experiment was designed to study the respective effects of the closed-state human palm and dynamic arm bending on intra-body communication channel attenuation. METHODS: We selected the right upper arm of a healthy adult male as the experimental object to measure channel attenuation variation in a closed or open palm, and when the arm was bent, so as to analyze channel characteristics. CONCLUSIONS: The experiment showed that, in a quasi-static stable system, the effects of a closed palm on channel attenuation were negligibly minimal. In contrast, the physiological signal of the living body significantly interfered with the channel in the low-frequency mode. In the dynamic arm-bending experiment, we found that the attenuation variation range corresponds to the intersection angle (90∘⩽θ⩽ 180∘) of the upper arm and forearm; these results provide the basis for the establishment of a theoretical model.
