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Paper Abstract and Keywords
Presentation 2018-11-02 20:05
[Invited Talk] High Efficient Wireless Power Transfer System Based on Focused Metasurfaces
Long Li, Pei Zhang, Xuanming Zhang, Haixia Liu (Xidian Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) In this talk, a new design of near-field focused metasurface for high-efficiency wireless power transfer with multi-focus characteristics is presented. In recent years, metasurfaces open a whole new paradigm in physics and engineering by enabling new microwave properties not achievable using conventional antennas and microwave devices. A metasurface with hundreds or thousands of periodic subwavelength elements, can be fabricated with a simple and low-cost PCB process, especially when produced in large quantities. By tailoring the properties of each element of the metasurface, one can spatially control the phase of scattered waves and consequently mold the wavefronts. The major feature of the design is that, with a large number of elements having elemental phase adjustment capability, it can achieve very accurate near-field focusing by using phase synthesis techniques. We firstly gives the theoretical study of near-field focused metasurface. Furthermore, four type focusing issues are raised, namely single focus and single feed (SFSF) case, two foci and single feed (TFSF) case, single focus and two feeds (SFTF) case, and two foci and two feeds (TFTF) case. Secondly, we presents the implementations of the near-field focused metasurfaces with 20?20 elements for single-focus and two-focus, namely P2P (point-to-point) and P2M (point-to- multipoint) wireless power transmission. Furthermore, the planar near-field measurement technique was used to scan the focus plane and validate the proposed approach and realized prototypes. The measured results for the two metasurfaces are reported and compared with the simulated performance. The results show the proposed metasurfaces with tri-dipole elements and cross-dipole elements can achieve a good near-field focused performance, which could work for P2P/P2M wireless power transmission. Finally, we investigates the wireless power transfer efficiency and far-field characteristics of the proposed metasurface. The results show that the excellent wireless power transmission characteristics can be achieved by the metasurface with the proposed design methodology. The proposed structure and design technique could be applied to many fields including multi-user wireless power transfer system, remote (non-contact) sensing, biological wearable devices and multi-object radio frequency identification (RFID) system.
Keyword (in Japanese) (See Japanese page) 
(in English) Metasurfaces / Wireless power transfer / near-field focused / multi-focus characteristics / / / /  
Reference Info. IEICE Tech. Rep.
Paper #  
Date of Issue  
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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Conference Information
Committee WPT  
Conference Date 2018-11-02 - 2018-11-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University 
Topics (in Japanese) (See Japanese page) 
Topics (in English) 2018 Asian Wireless Power Transfer Workshop (AWPT 2018) 
Paper Information
Registration To WPT 
Conference Code 2018-11-WPT 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) High Efficient Wireless Power Transfer System Based on Focused Metasurfaces 
Sub Title (in English)  
Keyword(1) Metasurfaces  
Keyword(2) Wireless power transfer  
Keyword(3) near-field focused  
Keyword(4) multi-focus characteristics  
1st Author's Name Long Li  
1st Author's Affiliation Xidian University (Xidian Univ.)
2nd Author's Name Pei Zhang  
2nd Author's Affiliation Xidian University (Xidian Univ.)
3rd Author's Name Xuanming Zhang  
3rd Author's Affiliation Xidian University (Xidian Univ.)
4th Author's Name Haixia Liu  
4th Author's Affiliation Xidian University (Xidian Univ.)
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Date Time 2018-11-02 20:05:00 
Presentation Time 50 
Registration for WPT 
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