Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting.
Efficient and Sensitive Electrically Small Rectenna for Ultra-Low Power RF Energy Harvesting.
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DOI：
10.1038/s41598-018-33388-w
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发表时间：
2018-10-09
影响因子：
4.6
通讯作者：
Samaras T
中科院分区：
文献类型：
--
作者：
Assimonis SD;Fusco V;Georgiadis A;Samaras T
本文介绍了一种尺寸为KA = 0.415的新型电小天线，并对其进行了制作和测试。本征匹配为50 Ω，在水平面上具有全向和线偏振的辐射方向图，最大方向性为1.75 dBI，模拟辐射效率为93%。该天线与一个单二极管低复数和共面整流器相结合，形成了一个高效率和高灵敏度的电小整流天线，在868RFIDMHZ(欧洲的超高频 = 频段)上，ka = 为0.53.后者测量了−19 dBm电源输入的效率为22.5%，−44 dBm的灵敏度(或相当于0.00028 μW/cm~2功率密度)，而在2.25 μW/cm~2能够连续供电，即不需要升压转换器或使用任何能源箱，一个118 μW的小型电气设备。为了增加直流输出电压和向较低功率密度水平的负载提供直流功率，采用了整流天线阵列配置。讨论了在无电池后向散射无线传感器节点供电中的应用。具体来说，对于0.1237 μW/cm~2的功率密度，射频能量采集系统每22.5 μS以2.85 V输出172 W。
A new electrically small antenna with size ka = 0.415 is presented, fabricated and measured in this work. This is intrinsically matched to 50 Ω, has omni-directional and linear-polarized radiation pattern in the horizontal plane with maximum directivity of 1.75 dBi and simulated radiation efficiency of 93%. The antenna in combination with a low-complex and co-planar rectifier with one single diode forms a high efficient and sensitive electrically small rectenna with ka = 0.53 at 868 MHz (UHF RFID-band in Europe). The latter has measured efficiency 22.5% for −19 dBm power input and sensitivity of −44 dBm (or equivalently 0.00028 μW/cm2 power density), while at 2.25 μW/cm2 is able to supply continuously, i.e., without a boost converter or use of any energy tank, a small electrical device with 118 μW. In order to increase the dc output voltage and the delivered dc power to the load for lower power density levels, rectenna-array configuration is exploited. Application to batteryless, backscatter wireless sensor node powering is discussed. Specifically, for a power density of 0.1237 μW/cm2 the RF energy harvesting system delivers 172 μW at 2.85 V every 22.5 s.
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DOI：
10.1109/tmtt.2017.2660487
发表时间：
2017-05-01
影响因子：
4.3
作者：
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发表时间：
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影响因子：
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