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首页> 外文期刊>IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology >Effects of Coaxial-Lateral and Coaxial-Angular Displacements on Link Efficiency of a Wirelessly Powered Optogenetic Implant: Design, Modeling, and Experimental Validation
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Effects of Coaxial-Lateral and Coaxial-Angular Displacements on Link Efficiency of a Wirelessly Powered Optogenetic Implant: Design, Modeling, and Experimental Validation

机译：同轴 - 横向和同轴角位移对无线动力光学植入物联结效率的影响：设计，建模和实验验证

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摘要

In recent years, the wireless power transfer (WPT) system has evolved tremendously as a means to deliver power to miniaturized implantable sensors. Efficiently delivering power to implants is a challenge due to the loose coupling between the transmitter and receiver coils because of the various displacements (coaxial, lateral, and angular). The coupling coefficient deteriorates significantly due to the displacements, thus decreasing the overall power transfer efficiency of the system. In this paper, we present an analysis and modeling of the effects of various displacements on the efficiency and the overall performance of a miniaturized WPT system designed for an optogenetic implant. To emulate the tissue media inside a human head, skin, skull, and gray matter layers are theoretically modeled using dielectric properties, and simulation models are developed using Ansys high-frequency structure simulator (HFSS) software. The propagation loss and the link efficiency are modeled and simulated as a function of various displacement combinations. To validate the theoretical and simulation models, the WPT system is characterized in various displacement conditions using chicken breast as the tissue media. The measurement results also show a good agreement with the simulation results, thus providing estimation for the misalignment tolerance range for given specifications. The efficiency performance analysis of the proposed WPT system for various worst-case scenarios also provides a preliminary model for designing a closed-loop wireless power delivery regulation scheme in the future.
机译：近年来，无线电力传输（WPT）系统已经发达得非常出现，作为为小型化植入传感器提供电力的手段。有效地提供植入物的功率是由于由于各种位移（同轴，横向和角度）的发射器和接收器线圈之间的松动耦合而产生挑战。耦合系数由于位移而显着劣化，从而降低了系统的整体功率传递效率。在本文中，我们对各种位移对效率和整体性能的影响分析和建模，以及专为近氨植入物设计的小型化WPT系统的整体性能。为了将组织介质模拟在人体头部，皮肤，颅骨和灰质层是使用电介质性质的理论建模，并且使用ANSYS高频结构模拟器（HFSS）软件开发仿真模型。传播损耗和链路效率被建模和模拟作为各种位移组合的函数。为了验证理论和仿真模型，WPT系统的特征在于使用鸡胸肉作为组织介质的各种位移条件。测量结果还显示出与模拟结果的良好一致性，从而为给定规范提供了对未对准公差范围的估计。针对各种最坏情况场景的提议WPT系统的效率性能分析还提供了在未来设计闭环无线电力输送调控方案的初步模型。

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