A Multi-Band Stacked RF Energy Harvester With RF-to-DC Efficiency Up to 84%
A Multi-Band Stacked RF Energy Harvester With RF-to-DC Efficiency Up to 84%
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DOI：
10.1109/tmtt.2015.2416233
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发表时间：
2015-05-01
影响因子：
4.3
通讯作者：
Person, Christian
中科院分区：
文献类型：
--
作者：
Kuhn, Veronique;Lahuec, Cyril;Person, Christian
本文的目的是展示收集射频能量以在室外环境中为无线传感器网络供电的可能性。在这些情况下，现有射频频段的数量是不可预测的。 RF 电路必须收集存在的所有潜在 RF 能量，并且不能针对单个 RF 音调进行设计。在本文中，设计的射频采集器增加了来自无限数量的子频段的功率。采集器的输出电压比随着射频频段数量的增加而增加。作为一个应用示例，设计了一个 4-RF 频段的整流天线。该系统同时从 GSM900（全球移动通信系统）、GSM1800、UMTS（通用移动电信系统）和 WiFi 频段收集能量。对于均匀分布在四个 RF 频段上的累积 -10 dBm 输入功率，测得 RF 至 DC 转换效率为 62%，在 5.8 dBm 时达到 84%。所有四个 RF 频段均开启时测得的直流输出功率与四个 RF 频段功率贡献的理想总和之间的相对误差小于 3%。结果表明，由于所提出的整流器架构，与使用单个射频源测量的效率相比，射频到直流的转换效率提高了一倍多。
The aim of this paper is to show the possibility to harvest RF energy to supply wireless sensor networks in an outdoor environment. In those conditions, the number of existing RF bands is unpredictable. The RF circuit has to harvest all the potential RF energy present and cannot be designed for a single RF tone. In this paper, the designed RF harvester adds powers coming from an unlimited number of sub-frequency bands. The harvester's output voltage ratios increase with the number of RF bands. As an application example, a 4-RF band rectenna is designed. The system harvests energy from GSM900 (Global System for Mobile Communications), GSM1800, UMTS (Universal Mobile Telecommunications System) and WiFi bands simultaneously. RF-to-dc conversion efficiency is measured at 62% for a cumulative -10-dBm input power homogeneously widespread over the four RF bands and reaches 84% at 5.8 dBm. The relative error between the measured dc output power with all four RF bands ON and the ideal sum of each of the four RF bands power contribution is less than 3%. It is shown that the RF-to-dc conversion efficiency is more than doubled compared to that measured with a single RF source, thanks to the proposed rectifier architecture.