| 講演抄録／キーワード |
| 講演名 |
2018-11-02 20:05
［招待講演］High Efficient Wireless Power Transfer System Based on Focused Metasurfaces
○Long Li・Pei Zhang・Xuanming Zhang・Haixia Liu（Xidian Univ.） |
| 抄録 |
（和） |
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. |
| （英） |
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. |
| キーワード |
（和） |
Metasurfaces / Wireless power transfer / near-field focused / multi-focus characteristics / / / / |
| （英） |
Metasurfaces / Wireless power transfer / near-field focused / multi-focus characteristics / / / / |
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