Quarter-Wave Plates to Improve Rotational Misalignment Robustness in Medical Telemetry.
Quarter-Wave Plates to Improve Rotational Misalignment Robustness in Medical Telemetry.
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DOI：
10.1002/bem.22365
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发表时间：
2021-10
影响因子：
1.9
通讯作者：
Kiourti A
中科院分区：
文献类型：
--
作者：
Blauert J;Kiourti A
开发植入/可摄取天线的鲁棒无线链路的主要挑战是潜在的旋转错位。在本文中，我们提出了一种人工各向异性四分之一波片（QWP），能够从线极化波发展成圆极化波。我们的QWP由塑料和水凝胶组成，而线性极化波由生物匹配天线（一种高增益宽带天线，带有与生物组织匹配的电介质）产生。使用基本植入贴片天线，我们证明了传输系数在90°变化范围内的1.00 dB（1.26）变化，在2.4 GHz下测量到的平均传输系数为- 34.4 dB（3.63*10 - 4）。没有QWP时，旋转方差为12.52 dB（17.9）。值得注意的是，QWP增加了最大输入功率，以符合特定的吸收率限制。在我们的案例中，这允许植入物接收到−15.0 dBm（31.6µW）的功率，这与没有QWP接收到的−15.7 dBm（26.9µW）相当。此外，我们证明了使用QWP，在2-3.62 GHz范围内，旋转失调与平均传输的标准偏差保持在3 dB（2.00）以下，导致模拟的分数带宽为57.7%。
A major challenge in developing robust wireless links to implanted/ingestible antennas is the potential for rotational misalignment. In this paper, we present an artificially anisotropic quarter-wave plate (QWP) capable of developing a circularly polarized wave from a linearly polarized wave. Without loss of generality, our QWP is composed of plastic and hydrogel, while the linearly polarized wave is developed by a Bio-Matched Antenna—a high gain, broadband antenna with a dielectric engineered to match to biological tissues. Using a basic implanted patch antenna, we demonstrate a 1.00 dB (1.26) variance in transmission coefficient over a 90° variance, with a remarkable average measured transmission coefficient of −34.4 dB (3.63*10−4) at 2.4 GHz. Without the QWP, the rotational variance is 12.52 dB (17.9). Notably, the QWP increases the maximum input power to comply with specific absorption rate limitations. In our case, this allows for −15.0 dBm (31.6 µW) of power to be received by the implant, which is comparable to the −15.7 dBm (26.9 µW) received without the QWP. Additionally, we demonstrate that with the QWP, the standard deviation from the mean transmission for rotational misalignments remains below 3 dB (2.00) from 2–3.62 GHz, resulting in a simulated 57.7% fractional bandwidth.
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