Implanted miniaturized antenna for brain computer interface applications: analysis and design.
Implanted miniaturized antenna for brain computer interface applications: analysis and design.
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DOI：
10.1371/journal.pone.0103945
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Ibrahim TS
中科院分区：
文献类型：
--
作者：
Zhao Y;Rennaker RL;Hutchens C;Ibrahim TS
植入式脑计算机接口（BCI）旨在为假体设备提供实时控制信号，研究大脑功能和/或恢复因损伤或疾病而丢失的感觉信息。使用射频（RF）为BCI无线供电可以广泛扩展应用数量并增加长期体内生存能力。然而，由于人脑组织的尺寸和电磁损耗的限制，植入式微型天线的辐射效率较低。这项工作提出了模拟，分析和植入天线的无线植入式射频供电的脑机接口应用的设计。结果表明，薄的（大约100微米厚）生物相容性绝缘层可以显著影响天线性能。适当选择生物相容性绝缘层的介电特性和人脑组织内的植入位置可以促进植入天线的有效RF功率接收。虽然结果表明，人体头部形状对植入式天线性能的影响可以忽略不计，但植入式天线周围脑组织的本构特性会显著影响植入式天线的电气特性（输入阻抗和工作频率）。三个小型化的天线设计进行了模拟，并证明，高达1.8毫瓦的最大射频功率可以在2 GHz时，天线周围的硬脑膜植入，而不违反比吸收率（SAR）的限制。
Implantable Brain Computer Interfaces (BCIs) are designed to provide real-time control signals for prosthetic devices, study brain function, and/or restore sensory information lost as a result of injury or disease. Using Radio Frequency (RF) to wirelessly power a BCI could widely extend the number of applications and increase chronic in-vivo viability. However, due to the limited size and the electromagnetic loss of human brain tissues, implanted miniaturized antennas suffer low radiation efficiency. This work presents simulations, analysis and designs of implanted antennas for a wireless implantable RF-powered brain computer interface application. The results show that thin (on the order of 100 micrometers thickness) biocompatible insulating layers can significantly impact the antenna performance. The proper selection of the dielectric properties of the biocompatible insulating layers and the implantation position inside human brain tissues can facilitate efficient RF power reception by the implanted antenna. While the results show that the effects of the human head shape on implanted antenna performance is somewhat negligible, the constitutive properties of the brain tissues surrounding the implanted antenna can significantly impact the electrical characteristics (input impedance, and operational frequency) of the implanted antenna. Three miniaturized antenna designs are simulated and demonstrate that maximum RF power of up to 1.8 milli-Watts can be received at 2 GHz when the antenna implanted around the dura, without violating the Specific Absorption Rate (SAR) limits.
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DOI：
10.1109/tnsre.2009.2023293
发表时间：
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影响因子：
4.9
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