基于特征模分析的1-bit转极化反射超表面阵列设计  

Design of 1-bit Polarization Twisting-based Metasurface Reflectarray Based on Characteristic Mode Analysis

作　　者：王瑞 孙精文 李腾[1,2] WANG Rui;SUN Jingwen;LI Teng(State Key Laboratory of Millimeter Waves,Southeast University,Nanjing 210096,China;Purple Mountain Laboratories,Nanjing 211111,China)

机构地区：[1]东南大学毫米波国家重点实验室,江苏南京210096 [2]紫金山实验室,江苏南京211111

出　　处：《无线电工程》2022年第2期256-262,共7页Radio Engineering

基　　金：国家自然科学基金(62001102)。

摘　　要：基于特征模理论分析了反射超表面单元模式特性和散射参数的关系,提出了一种仅需2个开关结构同时实现1-bit相位调控和转极化的单元结构,仿真分析表明单元工作带宽在26~33 GHz,并基于此设计了工作在Ka波段的波束倾角为0°和60°的1-bit转极化反射阵列。测试结果表明阵列可工作在27~33 GHz,最大增益分别为25.1,22.0 dBi,天线口径效率分别为12.5%和12.2%。该反射超表面单元结构简单,有效减少了开关数量,在低成本电扫反射阵列的应用中具有极大潜力。Based on the theory of characteristic modes,the relationship between the scattering parameters and the modal characteristics of reflective metasurface elements is analyzed.A reflective metasurface cell is proposed,which simultaneously realizes 1-bit phase variation and polarization twisting with only two switches.Simulation analysis shows that the operating bandwidth of the unit cell is between 26 GHz and 33 GHz.On this basis,1-bit polarization twisting reflectarrays with beam direction of 0°and 60°operating in Ka-band are designed.The measured results show that the reflectarrays operate from 27 GHz to 33 GHz.The maximum realized gains are 25.1,22.0 dBi respectively,and the antenna aperture efficiencies are 12.5%and 12.2%,respectively.The proposed reflective metasurface unit cell has a simple structure and it can effectively reduce the number of switches,which has a great potential in the applications of low-cost electrical beam scanning reflectarrays.

关 键 词：特征模分析理论 电磁超表面 反射阵列 波束扫描 转极化 编码波束赋形 

分 类 号：TN82[电子电信—信息与通信工程]