双层离散介质相位梯度超表面透镜设计  

Design of Phase Gradient Metasurface Lens for Double-Layer Discrete Medium

作　　者：凌沁璇 阮巍[1] 汪竹 李保 肖函海 LING Qinxuan;RUAN Wei;WANG Zhu;LI Bao;XIAO Hanmei(College of Optoelectronic Engineering,Chongqing University of Posts and Telecommunication,Chongqing 400065,China)

机构地区：[1]重庆邮电大学光电工程学院,重庆400065

出　　处：《电子器件》2023年第5期1449-1454,共6页Chinese Journal of Electron Devices

基　　金：重庆市自然科学基金项目(CSTB2022NSCQ-MSX0960)。

摘　　要：针对多层介质堆叠带来的介质损耗和不便加工等问题,利用介质离散单元设计了一款双层多频点超表面聚焦透镜。依据开口谐振环原理,设计了变形“工”字型、双“T”型的电容耦合臂结构作为超表面单元的金属层,采用两种单元分段覆盖的方式实现了360°的透射相位覆盖,并完成不同频段透射幅度的互补。仿真与测试结果表明,在14 GHz~17 GHz的Ku频段内,能够实现对x极化波的聚焦功能。中心频率15 GHz处,单元的透射率在0.83左右。阵列聚焦效果较优,所实现的3 dB焦斑直径约为22 mm,焦距为40 mm。通过单元介质离散化处理,相较于传统超表面透镜减少了层数,降低了介质损耗,简化了设计方式。该超表面透镜结构设计在通信等领域具有广泛的应用前景。Aiming at the problems of dielectric loss and inconvenience of processing caused by multi-layer dielectric stacking,a doublelayer multi-frequency point super-surface focusing lens is designed by using a dielectric discrete unit.According to the principle of split resonant ring,a deformed I-shaped and double-T-shaped capacitive coupling arm structure is designed as the metal layer of the metasurface unit,and a 360°transmission phase coverage is achieved by using two cell segmented coverage methods.The complementation of the transmission amplitude of different frequency bands is completed.Simulation and test results show that the focus function of the x polarized wave can be achieved in the Ku band of 14 GHz-17 GHz.The transmittance of the unit is about 0.83 at the center frequency of 15 GHz.The array focusing effect is better.The diameter of the achived 3 dB focal spot is about 22 mm,and the focal length is 40 mm.Through the discretization of the unit medium,compared with the traditional metasurface lens,the number of layers is reduced,the medium loss is reduced,and the design method is simplified.The metasurface lens structure design has a wide range of application prospects in the fields of communication and so on.

关 键 词：超表面 相位梯度 透射 聚焦 

分 类 号：TN820[电子电信—信息与通信工程]