Acta Photonica Sinica, Volume. 50, Issue 10, 1016001(2021)
Key Technologies of Microwave Wireless Power Transfer and Energy Harvesting Based on Electromagnetic Metamaterials（Invited）
Figures & Tables(13)
Fig. 1. Basic technological path of microwave wireless power transfer and wireless energy harvesting
Fig. 2. Multi-source and multi-focus MIMO-WPT reflective metasurface［36］
Fig. 3. X-band reflective metasurface with unequal power distribution characteristics［37］
Fig. 4. Schematic diagram of coding metasurface applications in wireless communication［41］
Fig. 5. Testing scenario and measured transfer efficiency of the adaptive intelligent WPT system based on 2-bit PMS［42］
Fig. 7. Research context and the significant progress of WEH metasurfaces
Table 1. Comparison of performances among different WEH metasurfaces
View tableView in ArticleTable 1. Comparison of performances among different WEH metasurfaces
References
（year）
Frequency /GHz Metasurface Periodicity
metasurface size
Maximum
harvesting
efficiency
Remarks ［
53 ］2012
5.8 SRR 0.18λ0
9×9
76% First introducing metasurface to WEH ［
54 ］2015
3 ELC resonator 0.08λ0
13×13
97% Single band ［
55 ］2015
5.55 Complementary SRR 0.34λ0
11×11
92% Wideband
high efficiency
［
57 ］2017
6.2~21.4 Square ring
resonator
0.44λ0
5×5
96% Wideband
polarization-insensitive
［
59 ］2017
0.9，2.6，5.7 Butterfly-type closed
loop resonator
0.08λ0
7×7
90% at 0.9 GHz
83% at 2.6 GHz
81% at 5.7 GHz
Tri-band
miniaturized
wide-angle
polarization-insensitive
［
64 ］2018
2.45，6 Ring resonator and
symmetric ELC resonator
0.09λ0
9×9
90% Coding metasurface
algorithm optimization
［
65 ］2019
5.33 Modified complementary
SRR
0.13λ0
11×11
86% Flexible
ultra-thin
［
63 ］2020
5.8 Centrally symmetrical circular
sectors surrounded by metal vias
0.29λ0
5×5
91% Frequency stability
wide-angle
polarization-insensitive
Table 2. Detailed comparison of microwave WPT and WEH
View tableView in ArticleTable 2. Detailed comparison of microwave WPT and WEH
WPT WEH Main requirement High energy transmission and conversion efficiency Application scenarios Mid to high power devices Low power sensors Transmitting-receiving Point-to-point Space-to-point Operating frequency Dedicated
narrowband
Communication bands，ISM bands，etc.
wideband/multi-band
Radiation pattern High gain/directivity Wide incident angle（omni-directivity） Polarization requirement Alignment Polarization insensitive Required characteristics
of metasurface
Amplitude，phase，and wavefront regulation of metasurface unit Harvest wireless energy
Multimode resonance effect of metasurface array
Future directions with metasurface Adaptive，programmable，intelligent regulation
Simultaneous wireless information and power transfer
Rectifying metasurface
Hybrid energy harvesting for energy Autonomous of WSN
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Long LI, Pei ZHANG, Jiaqi HAN, Tiejun CUI. Key Technologies of Microwave Wireless Power Transfer and Energy Harvesting Based on Electromagnetic Metamaterials（Invited）[J]. Acta Photonica Sinica, 2021, 50(10): 1016001
Paper Information
Category: Materials
Received: Jul. 9, 2021
Accepted: Aug. 10, 2021
Published Online: Nov. 3, 2021
The Author Email: CUI Tiejun (tjcui@seu.edu.cn)
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