arXiv 2110.048852021-10-10eess.SP

基于动态超表面微阵列的近场无线功率传输

Near-Field Wireless Power Transfer with Dynamic Metasurface Antennas

Haiyang Zhang, Nir Shlezinger, Francesco Guidi, Davide Dardari, Mohammadreza F Imani, Yonina C Eldar

备注：: This work has been submitted to the IEEE for possible publication

摘要：

射频无线功率传输（WPT）能够为低功率移动设备充电，而无需依赖有线基础设施。当前现有的WPT系统通常是假设远场传播来设计的，其中辐射能量以给定角度转向，导致有限的效率和在不期望的位置中的可能辐射。当采用高频的大型阵列（例如DMA）时，WPT可能发生在球面波传播保持的辐射近场（菲涅尔）区域，而不是远场中的平面波传播。在本文中，我们研究了WPT系统在菲涅尔区域中对多个设备充电，其中能量发射器配备了新兴的DMA，探索天线配置如何利用球面波阵面来产生聚焦能量束。特别是，提出了一个基于DMA的辐射近场WPT系统的数学模型后，我们所考虑的系统的加权和收获的能量最大化问题的特征，我们提出了一个有效的解决方案，联合设计DMA权重和数字预编码向量。仿真结果表明，我们的设计产生的聚焦能量束，能够提高能量传输效率的辐射近场与最小的能量污染。

英文摘要：

Radio frequency wireless power transfer (WPT) enables charging low-power mobile devices without relying on wired infrastructure. Current existing WPT systems are typically designed assuming far-field propagation, where the radiated energy is steered in given angles, resulting in limited efficiency and possible radiation in undesired locations. When large arrays at high frequencies, such as DMA, are employed, WPT might take place in the radiating near-field (Fresnel) region where spherical wave propagation holds, rather than plane wave propagation as in the far-field. In this paper, we study WPT systems charging multiple devices in the Fresnel region, where the energy transmitter is equipped with an emerging DMA, exploring how the antenna configuration can exploit the spherical wavefront to generate focused energy beams. In particular, after presenting a mathematical model for DMA-based radiating near-field WPT systems, we characterize the weighted sum-harvested energy maximization problem of the considered system, and we propose an efficient solution to jointly design the DMA weights and digital precoding vector. Simulation results show that our design generates focused energy beams that are capable of improving energy transfer efficiency in the radiating near-field with minimal energy pollution.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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