Time-Modulated Transmissive Programmable Metasurface for Low Sidelobe Beam Scanning

查看全文 作　　者：Xudong [1]Baio;Fuli [1,2]Zhang;Li [1]Sun;Anjie [3]Cao;Jin [4]Zhang;Chong [4]He;Longhai [5]Liu;Jianquan [5]Yao;Weiren [4]Zhu

机构地区：[1]School of Microelectronics,Northwestern Polytechnical University,Taicang,215400 Suzhou,China;[2]School of Physical Science and Technology,Northwestern Polytechnical University,Xian 710072,China;[3]Shanghai Institute of Satelite Engineering,Shanghai 201109,China;[4]Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;[5]Colege of Precision Instruments and Opto-Electronics Engineering,Institute of Laser and Optoelectronics,Tianjin University,Tianjin300072,China

出　　处：《Research》索引2022年第4期,共9页

基　　金：The authors acknowledge supports sponsored by the Shanghai Sailing Program(20YFi447000);the NWPU research fund for young scholars(G2022WD01008);the National NaturalScienceeFoundationofChina(61735010,61901263,and 62071291);the National Key Research and Development Program of China(2017YFA0700202). 摘　　要：Programmable metasurfaces have great potential for the implementation of low-complexity and low-cost phased arrays.Due to the difficulty of multiple-bit phase control,conventional programmable metasurfaces suffer a relatively high sidelobe level(SLL).In this manuscript,a time modulation strategy is introduced in the 1-bit transmissive programmable metasurface for reducing the SLLs of the generated patterns.After the periodic time modulation,harmonics are generated in each reconfigurable unit and the phase of the first-order harmonic can be dynamically controlled by applying different modulation sequences onto the corresponding unit.Through the high-speed modulation of the real-time periodic coding sequences on the metasurface by the programmable bias circuit,the equivalent phase shift accuracy to each metasurface unit can be improved to 6-bit and thus the SLLs of the metasurface could be reduced remarkably.The proposed time-modulated strategy is verified both numerically and experimentally with a transmissive programmable metasurface,which obtains an aperture efficiency over 34%and reduced SLLs of about-2o dB.The proposed design could offer a novel approach of a programmable metasurface framework for radar detection and secure communication applications. 关键词：SURFACE PERIODIC HARMONICS

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Time-Modulated Transmissive Programmable Metasurface for Low Sidelobe Beam Scanning

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