| 摘要: |
| 菲涅尔区多点聚焦已成为一种应用广泛的电磁能量聚合方法。然而，多点聚焦的能量传输效率受无线环境特别是非视距（Non-Line of Sight，NLOS）环境的影响较大。针对该问题，首先研究了可编程超表面的功能模型，在此基础上，提出一种基于可编程超表面的菲涅尔区全息多点聚焦方法；然后，针对该方法中的超表面结构单元、可编程超表面及其聚焦和准直特性进行了仿真分析。仿真结果表明，在相同的NLOS环境下，不采用可编程超表面的方法传输效率不高于5%；而所提方法允许针对不同无线设备以最适宜的方式进行电磁传播规律的编程定制，最高具有近60%的传播效率。因此，所提方法能够有效突破NLOS环境的限制，大大提高菲涅尔区多点聚焦的传输效率，有望应用在医疗超声、光学成像、无线能量传输、新一代移动通信等多个领域。 |
| 关键词: 电磁能量聚合 多点聚焦 可编程超表面 非视距传输 菲涅尔区 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（U1804148） |
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| A holographic multi-point focusing method in Fresnel zone under NLOS environment |
| LUO Wenyu,XU Li,ZHANG Lijian |
| (School of Physics and Electronics,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Unit 32180 of PLA,Beijing 100072,China) |
| Abstract: |
| Multi-point focusing in Fresnel zone has become a widely used method of electromagnetic energy aggregation.However,the energy transmission efficiency of multi-point focusing is greatly affected by the wireless environment,especially the non-line of sight(NLOS) environment.To solve this problem,the functional model of programmable metasurface is studied.On this basis,a holographic multi-point focusing method based on programmable metasurface in Fresnel zone is proposed.Then,the metasurface structure unit,programmable metasurface and its focusing and alignment characteristics are simulated and analyzed.The simulation results show that the transmission efficiency of the method without using programmable metasurface is not higher than 5% in the same NLOS environment,the method proposed allows the programming customization of electromagnetic propagation law in the most appropriate way for different wireless devices,with a maximum transmission efficiency of nearly 60%.Therefore,the proposed method can effectively break through the limitations of NLOS environment and greatly improve the transmission efficiency of multi-point focusing in Fresnel area.It is expected to be applied in medical ultrasound,optical imaging,wireless power transfer,new generation mobile communication and other fields. |
| Key words: electromagnetic energy aggregation multi-point focusing programmable metasurface non-line of sight Fresnel zone |
《电讯技术》编辑部 