解决磁共振人体通信失谐问题的场-电路组合方法

IF 3 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Lixuan Huang;Ziliang Wei;Bingheng Chen;Sio Hang Pun;Mang I Vai;Yueming Gao
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引用次数: 0

摘要

实现可穿戴医疗设备的技术挑战在于确保低功耗和可靠的通信传输。磁共振人体通信(MR HBC)为改善传输效果提供了思路。虽然已经提出了磁共振人体通信的线圈共振特性,但该方法的建模和阻抗匹配仍处于探索阶段。然而,不同人体阻抗对线圈共振频率的影响程度不同,从而导致磁耦合程度的个体差异性。本文通过有限元法(FEM)模拟建模分析了人体组织对线圈的影响。通过采用基于场-电路组合的双可调电容器匹配方法,可以消除这种影响。通过实时动态调整双可调电容器的值,可将人体和线圈调谐到共振状态,从而有效改善磁耦合度。研究结果表明,在不同人体组织的预设频率下,该方法可将通信增益提高 38.91-42.02 dB。体内实验验证了该方法消除了不同人体阻抗对线圈的影响,这对进一步提高磁共振 HBC 的性能具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Field-Circuit Combination Method for Solving the Detuning Problem of Magnetic Resonance Human Body Communication
The technological challenge to realize wearable medical devices is to ensure low power consumption and reliable transmission of communication. Magnetic resonance human body communication (MR HBC) provides ideas to improve the transmission effect. Although the coil's resonance properties have been proposed for MR HBC, the modeling and impedance matching for this method are still in the exploratory stage. However, different human impedances affect the coil resonance frequency to varying extents, leading to individual variability in the degree of magnetic coupling. This paper analyzes the influence of human tissues on the coil through finite element method (FEM) simulation modeling. This effect can be eliminated by employing a dual tunable capacitor matching method based on the field-circuit combination. By dynamically adjusting the values of the dual tunable capacitors in real-time, the human body and the coil can be tuned to a resonant state, effectively improving the degree of magnetic coupling. The results reveal that the proposed method enhances the communication gain by 38.91–42.02 dB at the preset frequency for different human tissues. In vivo experiments verify that the method eliminates the effect of different human impedances on the coil, which is of great significance for further improving the performance of MR HBC.
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来源期刊
CiteScore
5.80
自引率
9.40%
发文量
58
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