使用体适形WPT系统的植入体供电效率的物理界限

Í. V. Soares, Mingxiang Gao, A. Skrivervik, Z. Šipuš, M. Zhadobov, R. Sauleau, D. Nikolayev
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引用次数: 8

摘要

用于植入物供电的体上无线电力传输系统的效率由电磁能量如何与有损、异质和分散的身体组织相互作用来定义。本研究的目的是讨论频率相关电磁能量传递效率的方法和评估理论界限。我们提出了一个简化的模型,该模型使用有限组织等效的幻影封装一个可植入的接收器,该接收器被代表与身体波阻抗匹配的发射器的介质包围。该模型用于研究不同情况,并评估无线能量传输效率随工作频率和植入深度的函数关系。所得结果可作为选择车载电源的设计参数和约束条件的指导,并根据预测的最大可实现效率来衡量其性能。
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Physical Bounds on Implant Powering Efficiency Using Body-Conformal WPT Systems
The efficiency of an on-body wireless power transfer system for implant powering is defined by how the electromagnetic energy interacts with the lossy, heterogeneous, and dispersive body tissues. The objective of this study is to discuss the methodology and evaluate the theoretical bounds for the frequency-dependent electromagnetic energy transfer efficiency. We propose a simplified model that uses a finite tissue-equivalent phantom enclosing an implantable receiver surrounded by a medium that represents a transmitter matched to the wave impedance of the body. This model is used to study different cases and evaluate the wireless power transfer efficiency as a function of the operating frequency and implantation depth. The obtained results can be used as a guideline to choose the design parameters and constraints of the on-body power source and gauge its performance against the predicted maximum achievable efficiency.
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