Circularly Polarized Dual-Mode Wearable Implant Repeater Antenna With Enhanced Into-Body Gain
Circularly Polarized Dual-Mode Wearable Implant Repeater Antenna With Enhanced Into-Body Gain
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DOI：
10.1109/tap.2020.2972335
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发表时间：
2020-05-01
影响因子：
5.7
通讯作者：
Scanlon, William G.
中科院分区：
文献类型：
--
作者：
Magill, Matthew;Conway, Gareth A.;Scanlon, William G.
提出了一种可穿戴带状线馈电圆极化双贴片天线结构，该结构具有增强的体内增益。该天线专为体表中继器解决方案而设计，它解决了体内深层组织通信链路的边际问题，其中功耗至关重要，系统链路效率也至关重要。在实际操作条件下，天线的圆极化 (CP) 成功地减轻了植入方向和极化失配。线性天线的极化损耗在无回声环境中最高可达 16 dB，在实际多径环境中最高可达 12.5 dB，正如测量的植入天线和线性极化表面天线之间的同极化和交叉极化前向路径增益所证明的那样。为了克服天线接地面的人体隔离效应并产生有效的离体模式，开发了一种新型双孔径带状线馈电，这也提高了人体安装天线的辐射效率。该天线提供 0 dBi 离体增益，同时仍保持出色的入体性能。体内链路显示出 CP，在 2.36-2.4 GHz 频段内同极化和交叉极化测量之间的最大隔离度仅为 1.5 dB。所有测量均使用准确的下一代分层模型进行，该模型经过测试，代表了广泛的人群。
A wearable stripline-fed circularly polarized dual-patch antenna structure that exhibits enhanced into-body gain is presented. The antenna is designed for body-surface repeater solutions and it addresses the problem of marginal into-body deep tissue communication links, where power consumption is of the utmost importance and system link efficiency is critical. Under realistic operation conditions, the antenna's circular polarization (CP) successfully mitigates implant orientation and polarization mismatch. Polarization loss for linear antennas can be up to 16 dB in anechoic environments and as much as 12.5 dB in a realistic multipath environment, as demonstrated by measured co- and cross-polar forward path gain between implanted and linearly polarized surface antennas. To overcome the body-isolating effect of an antenna ground plane and to produce an effective off-body mode, a novel dual-aperture stripline feed was developed which also improves the body-mounted antenna radiation efficiency. The antenna provides a 0 dBi off-body gain while still maintaining excellent into-body performance. The into-body link was shown to exhibit CP with a maximum isolation of only 1.5 dB between co- and cross-polar measurements in the 2.36-2.4 GHz band. All measurements were carried out using an accurate, next-generation layered phantom tested representative of a wide range of the population.