基于语音识别的电磁调控智能超表面  

A Smart Metasurface for Electromagnetic Manipulation Based on Speech Recognition

作　　者：柏林 刘元可 徐亮 张政 王强 蒋卫祥 仇成伟 崔铁军 Lin Bai;Yuan Ke Liu;Liang Xu;Zheng Zhang;Qiang Wang;Wei Xiang Jiang;Cheng-Wei Qiu;Tie Jun Cui(State Key Laboratory of Millimeter Waves,School of Information Science and Engineering,Southeast University,Nanjing 210096,China;Purple Mountain Laboratories,Nanjing 211111,China;Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore)

机构地区：[1]State Key Laboratory of Millimeter Waves,School of Information Science and Engineering,Southeast University,Nanjing 210096,China [2]Purple Mountain Laboratories,Nanjing 211111,China [3]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore

出　　处：《Engineering》2023年第3期185-190,共6页工程（英文）

基　　金：the National Key Research and Development Program of China(2017YFA0700201,2017YFA0700203,and 2016YFC0800401);the National Natural Science Foundation of China(61890544);the Fundamental Research Funds for the Central Universities(2242021k30040);the 111 Project(111-2-05).

摘　　要：本文提出并实现了一种基于人类语音识别的智能超表面,用于对电磁波束进行可编程调控。该智能超表面平台由数字编码超表面、语音识别模块、单片机和数模转换器(DAC)电路组成,可根据预先存储的语音指令对电磁波进行智能控制。所构建的数字编码超表面包含6×6个超级子单元,每个超级子单元由4×4个嵌入了变容二极管的有源数字单元组成。语音识别模块配合DAC和单片机对语音指令进行识别,并生成对应的电压序列来控制超表面。此外,在超表面的设计过程中引入遗传算法,可有效优化超表面相位分布。为了验证智能超表面平台的性能,演示了雷达散射截面积缩减、涡旋波束生成和波束分裂三种典型功能。所提出的方案为调控电磁波提供了一种新的途径,并在电磁和声学通信之间架起了连接桥梁。In this work,we propose and realize a smart metasurface for programming electromagnetic(EM)manipulations based on human speech recognition.The smart metasurface platform is composed of a digital coding metasurface,a speech-recognition module,a single-chip computer,and a digital-to-analog converter(DAC)circuit,and can control EM waves according to pre-stored voice commands in a smart way.The constructed digital metasurface contains 6×6 super unit cells,each of which consists of 4×4 active elements with embedded varactor diodes.Together with the DAC and single-chip computer,the speech-recognition module can recognize voice commands and generate corresponding voltage sequences to control the metasurface.In addition,a genetic algorithm(GA)is adopted in the design of the metasurface for efficiently optimizing the phase distributions.To verify the performance of the smart metasurface platform,three typical functions are demonstrated:radar cross-section reduction,vortex beam generation,and beam splitting.The proposed strategy may offer a new avenue for controlling EM waves and establishing a link between EM and acoustic communications.

关 键 词：Speech recognition Programmable metasurface Genetic algorithm Smart electromagnetic manipulation 

分 类 号：TB34[一般工业技术—材料科学与工程]