Investigation of a microwave data telemetry link for a retinal prosthesis
Investigation of a microwave data telemetry link for a retinal prosthesis
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DOI：
10.1109/tmtt.2004.832007
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发表时间：
2004-08-01
影响因子：
4.3
通讯作者：
Humayun, M
中科院分区：
文献类型：
--
作者：
Gosalia, K;Lazzi, G;Humayun, M
在本文中，我们研究了一种新的方法，建立一个数据遥测链接的双单元视网膜假体在微波频率（1.45和2.45 GHz）使用。一对微带贴片天线。适当大小的眼外（25 × 25 mm）和眼内（6 × 6 mm）天线的设计，在这两个频率使用时域有限差分法，它们之间的耦合计算检查中存在的0.25 mm分辨率的人头模型。数值和实验之间的耦合结果显示良好的一致性，并观察到，眼球作为植入天线的介电透镜，从而提高了眼外和眼内天线之间的耦合。还在两个频率下进行比吸收率（SAR）计算，并计算峰值1-g SAR值。天线的设计问题，结果的数值和实验耦合测量，SAR计算的详细分析。
In this paper, we investigate a novel approach of establishing a data telemetry link for a dual-unit retinal prosthesis at microwave frequencies (1.45 and 2.45 GHz) using. a pair of microstrip patch antennas. Appropriately sized extraocular (25 x 25 mm) and intraocular (6 x 6 mm) antennas are designed to operate at both the frequencies using the finite-difference time-domain method, and the coupling between them is examined computationally in the presence of a 0.25-mm resolution human-head model. Good agreement between numerical and experimental coupling results is shown and it is observed that the eyeball acts as a dielectric lens for the implanted antenna, thus improving the coupling between the extraticular and intraocular antennas. Specific absorption rate (SAR) computations are also performed at both the frequencies, and the peak 1-g SAR value is calculated. Detailed analysis of the design issues of the antennas, results of the numerical and,experimental coupling measurements, and SAR calculations are presented.