基于液晶的28 GHz可调反射阵列天线单元研究  

Investigation on 28 GHz tunable reflect⁃array antenna unit cells based on liquid crystal

作　　者：花磊 牛连生 严静 于映[1,2] HUA Lei;NIU Liansheng;YAN Jing;YU Ying(College of Integrated Circuit Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;National and Local Joint Engineering Laboratory of RF Integration and Micro Assembly Technology,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学集成电路科学与工程学院,江苏南京210023 [2]南京邮电大学射频集成与微组装技术国家地方联合工程实验室,江苏南京210023

出　　处：《南京邮电大学学报（自然科学版）》2022年第6期45-51,共7页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家自然科学基金(11904177)资助项目。

摘　　要：利用液晶作为可调相对介电常数衬底层引入反射阵列天线单元,实现了两款单元反射相位的连续可调。采用了5CB和E7两款液晶,以及0.168 mm和0.203 mm两种垫片厚度,对单元进行测试。测试结果表明,由于加工误差和液晶材料本身的局限性等因素,两款单元最佳测试结果分别为在25.2 GHz下实现105°的相移,最大损耗为24 dB,以及在26.05 GHz下实现75°的相移,最大损耗为18 dB。对中心为十字贴片的单元进行了组阵仿真,在液晶层相对介电常数设置为2.4~3.2的条件下,该阵列实现了±45°的宽角度波束扫描。最后,对测得的相移曲线与仿真进行拟合,得到实验中的液晶(5CB)在25.5 GHz左右时的相对介电常数变化范围为2.70~2.84。Liquid crystal is used as the substrate layer of adjustable relative permittivity to introduce the reflect⁃array antenna unit cells in this paper.This approach realizes the continuous adjustment of the reflection phase of the two unit cells.Two liquid crystal materials,5CB and E7,and two spacer thicknesses of 0.168 mm and 0.203 mm are used to test the unit cells.The test shows that due to the factors such as processing errors and the limitations of the liquid crystal materials,the best test results of the two unit cells are 105°phase shift at 25.2 GHz with a maximum loss of 24 dB,and 75°phase shift at 26.05 GHz with a maximum loss of 18dB.Under the condition that the relative permittivity of the liquid crystal layer is set to 2.4—3.2,the array simulation is carried out for the unit cell with the cross patch in the center,and the array realizes the wide⁃angle beam scanning of±45°.Finally,after fitting the measured phase shift curve with the simulation,it is obtained that the relative permittivity of the liquid crystal(5CB)used in the experiment varies from about 2.7 to 2.84 at about 25.5 GHz.

关 键 词：液晶 相对介电常数 反射阵列天线单元 波束扫描 

分 类 号：TN821[电子电信—信息与通信工程]