Shaping flattened scattering patterns in broadband using passive reconfigurable intelligent surfaces for indoor NLOS wireless signal coverage enhancement

ITU Journal on Future and Evolving Technologies Pub Date : 2023-03-02 DOI:10.52953/oxlx7838

Hao Yi, Jiaqi Han, Xiangjin Ma, Long Li, T. Cui, Jun Cui

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Abstract

A novel Passive Reconfigurable Intelligent Surface (PRIS) with 100 × 100 elements, which is shaped to scatter flattened patterns in broadband, is presented to enhance the signal coverage of the indoor Non-Line-of-Sight (NLOS) area for 5G millimeter wave (mmWave) wireless communications. The signal from the base station antenna as a primary source can be deflected to the NLOS area by the proposed PRIS with a flattened scattering pattern that is insusceptible to being blocked. The broadband meta-atom, realized by the framed four arrow branches, operates from 24 GHz to 30 GHz. The genetic algorithm is applied to optimize the phase shift distribution of PRIS for a shaped pattern. Combining full-wave simulation and 3D ray-tracing simulation, the signal coverage is computed in an indoor L-shaped corridor scenario for 5G mmWave wireless communications. To verify the design, the proposed PRIS is further manufactured and tested. The experimental results reveal that the signal enhancement in the NLOS area by the proposed PRIS with the flattened scattering pattern is superior to the conventional design.

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利用无源可重构智能表面在宽带中塑造平坦的散射模式，增强室内NLOS无线信号覆盖

为了增强5G毫米波(mmWave)无线通信室内非视距(NLOS)区域的信号覆盖，提出了一种具有100 × 100个单元的新型无源可重构智能表面(PRIS)，其形状可在宽带中散射扁平图案。作为主要信号源的基站天线信号可以通过所提出的PRIS以不易被阻挡的平坦散射模式偏转到NLOS区域。宽带元原子由框架的四个箭头分支实现，工作在24 GHz到30 GHz之间。采用遗传算法对形状图形的相移分布进行优化。结合全波仿真和三维光线追踪仿真，在5G毫米波无线通信的室内l型走廊场景下计算信号覆盖范围。为了验证设计，建议的PRIS进一步制造和测试。实验结果表明，采用扁平散射模式的PRIS对近视点区域的信号增强效果优于传统设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ITU Journal on Future and Evolving Technologies

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