摘要
提出了一种频率和相位复合可重构的超表面设计方法.该方法在超表面单元引入N个PIN二极管,借由其通断改变单元的谐振特性,形成2^(N)个可调控的反射相位,选择适当的结构参数,可以使2^(N)个反射相位在不同频带内呈现出180°相位差,综合利用频率和相位调控特性,即可有效扩展可重构相移超表面的工作带宽.采用该方法,设计了一款超宽带1比特相移超表面单元,其1比特相位的调控频段覆盖5.4—13.0 GHz,相对带宽为82.6%,通过引入集总电容和优化其位置,精准改变电流分布,实现了单元的低损耗性能.该单元的厚度仅为0.09λ,其具有低剖面、低成本、低损耗特点.进一步利用该单元构造了16×16单元的超表面,通过不同的阵列编码,超表面能够产生散射可控波束和轨道角动量涡旋波,并在超宽带范围内实现了10 dB以上的雷达散射截面减缩效果,展现出动态灵活的波束调控和低散射性能.
In this paper,a design method is presented for frequency-phase composite reconfigurable metasurfaces.N PIN diodes are introduced into the metasurface unit.The on-off states of these PIN diodes regulate the resonance characteristics of the unit,constructing 2^(N) switchable reflection phase states.After optimizing structural parameters,these reflection phase curves show that there is a 180°phase difference between different frequency bands.By regulating frequency and phase regulation,the operational bandwidth of reconfigurable phase-shifting metasurface is effectively expanded.Based on this method,an ultra-wideband 1-bit phase-shifting metasurface unit is designed.Its 1-bit phase regulation band covers 5.4–13.0 GHz,with a relative bandwidth of 82.6%.Lumped capacitors are adopted and their positions are optimized to precisely adjust current distribution,enabling low-loss performance of the unit.The unit with a thickness of only 0.09λ features low profile,low cost,and low loss.A 16×16 unit array is further constructed.Through coding regulation,the metasurface can generate scattering-controllable beams and orbital angular momentum vortex waves.Experimental results show that the metasurface can achieve a radar cross section reduction of over 10 dB in the ultra-wideband range,demonstrating dynamic beam steering capability and high-efficiency low-scattering performance.This design offers new insights into applying reconfigurable metasurfaces to broadband communication,radar stealth,and intelligent electromagnetic environment regulation.
作者
廖嘉伟
杨欢欢
李桐
季轲峰
张芷昀
吴天昊
邹靖
孙代飞
LIAO Jiawei;YANG Huanhuan;LI Tong;JI Kefeng;ZHANG Zhiyun;WU Tianhao;ZOU Jing;SUN Daifei(Information and Navigation College,Air Force Engineering University,Xi’an 710077,China)
出处
《物理学报》
北大核心
2025年第18期132-142,共11页
Acta Physica Sinica
基金
国家自然科学基金(批准号:62371466,62401618,62171460)
陕西省自然科学基础研究计划(批准号:2024JC-ZDXM-39,2025JC-YBMS-708,20220104,2020022)资助的课题.
关键词
可重构超表面
超宽带
频率可重构
低雷达散射截面
reconfigurable metasurface
ultra-wideband
frequency reconfigurable
low radar cross section
