Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm2 Wearable Power Harvesting
Omnidirectional Dual-Polarized Low-Profile Textile Rectenna With Over 50% Efficiency for Sub-μW/cm2 Wearable Power Harvesting
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DOI：
10.1109/tap.2020.3030992
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发表时间：
2021-05-01
影响因子：
5.7
通讯作者：
Beeby, Steve
中科院分区：
文献类型：
--
作者：
Wagih, Mahmoud;Weddell, Alex S.;Beeby, Steve
尽管纺织天线最近取得了进展，但在整流天线等完整系统中，完全纺织解决方案的效率比混合纺织/刚性实施方案低 46% 以上。本文介绍了一种用于超低功耗亚μW/cm(2) 应用的全织物整流天线。提出了一种双极化全向薄型纺织天线。整流天线基于紧凑型电感匹配整流器。基于织物的整流器占地 0.22 cm(2)，尽管其基板有损耗，但在 -20 dBm、820 MHz 条件下仍能实现 41.8% 的最先进功率转换效率 (PCE)。然后设计并制造了三频整流器，以显示匹配方法的可扩展性。该整流器在对电容器充电时使用一段时间内的新品质因数“平均 PCE”来表征。时变 S 参数用于量化电容器电荷对阻抗匹配的影响。该整流器分别在 0.41 秒和 4.5 秒内从 10 dBm 和 0 dBm 直接将 1.32 mF 电容器充电至 1 V。所提出的整流天线的无线测试表明，在太空和体上分别有超过 50% 和 40% (PCE) 低于 1 mu W/cm(2)。整流天线可有效接收来自不匹配偏振的功率，并具有 360 度半功率波束宽度。
Despite the recent advances in textile antennas, in complete systems such as a rectenna, the efficiency of fully textile solutions has been over 46% lower than hybrid textile/rigid implementations. This article presents a fully textile rectenna for ultralow-power sub-mu W/cm(2) applications. A dual-polarized omnidirectional low-profile textile antenna is presented. The rectenna is based on a compact inductively matched rectifier. The textile-based rectifier occupies 0.22 cm(2) and achieves a state-of-the-art power conversion efficiency (PCE) of 41.8% at -20 dBm, at 820 MHz, despite its lossy substrate. A triple-band rectifier is then designed and fabricated to show the scalability of the matching approach. The rectifier is characterized using a new figure of merit "average PCE" over a time period while charging a capacitor. Time-varying S-parameters are used to quantify the impact of the capacitor's charge on the impedance matching. The rectifier directly charges a 1.32 mF capacitor up to 1 V in 0.41 and 4.5 s from 10 and 0 dBm, respectively. Wireless testing of the proposed rectenna demonstrates over 50% and 40% (PCE) below 1 mu W/cm(2) in space and on-body, respectively. The rectenna efficiently receives power from mismatched polarization and with a 360 degrees half-power beamwidth.