Programmable array antenna based on nematic liquid crystals for the Ka-band  

一种基于向列液晶的Ka频段可编程天线阵

作　　者：WANG Qiang KE Junchen BAI Lin 王强;柯俊臣;柏林(桂林电子科技大学广西光电信息处理重点实验室,桂林541004;桂林电子科技大学光电工程学院,桂林541004;东南大学信息科学与工程学院,南京211189)

机构地区：[1]Guangxi Key Laboratory of Optoelectronic Information Processing,Guilin University of Electronic Technology,Guilin 541004,China [2]School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin 541004,China [3]School of Information Science and Engineering,Southeast University,Nanjing 211189,China

出　　处：《Journal of Southeast University(English Edition)》2025年第1期78-83,共6页东南大学学报(英文版)

基　　金：The National Natural Science Foundation of China(No.62401168,62401139,62401170);China Postdoctoral Science Foundation(No.2023MD744197);Postdoctoral Fellowship Program of CPSF(No.GZC20230631);Project for Enhancing Young and Middle-aged Teacher’s Research Basis Ability in Colleges of Guangxi(No.2023KY0218);Guangxi Key Laboratory Foundation of Optoelectronic Information Processing(No.GD23102)。

摘　　要：A programmable low-profile array antenna based on nematic liquid crystals(NLCs)is proposed.Each antenna unit comprises a square patch radiating structure and a tunable NLC-based phase shifter capable of achieving a phase shift exceeding 360°with high linearity.First,the above 64 antenna units are periodically arranged into an 8×8 NLC-based antenna array,and the bias voltage of the NLC-based phase shifter loaded on the antenna unit is adjusted through the control of the field-programmable gate array(FPGA)programming sequences.This configuration enables precise phase changes for all 64 channels.Numerical simulation,sample processing,and experimental measurements of the antenna array are conducted to validate the performance of the antenna.The numerical and experimental results demonstrate that the proposed antenna performs well within the frequency range of 19.5-20.5 GHz,with a 3 dB relative bandwidth of 10%and a maximum main lobe gain of 14.1 dBi.A maximum scanning angle of±34°is achieved through the adjustment of the FPGA programming sequence.This NLC-based programmable array antenna shows promising potential for applications in satellite communication.设计了一款基于向列液晶的可编程低剖面动态波束扫描阵列天线。该天线单元由方形的辐射贴片结构和向列液晶移相器组成,其中移相器能够实现全相位360°线性变化。首先,将上述64个液晶天线单元周期排列成8×8的阵列天线,通过控制现场可编程门阵列(FPGA)编程编码序列来调节加载在天线单元中液晶移相器的电压,并提供相应的相位变化,从而对64路的液晶天线单元进行独立馈电控制。随后,对该天线阵列进行了数值仿真、样品加工和实验测量。数值仿真和实验测量的结果表明,该天线在19.5~20.5 GHz频率范围内具有良好的性能,3 dB增益带宽为10%,主瓣最大增益为14.1 dBi。通过控制FPGA的编码序列可实现±34°的波束动态扫描。该向列液晶天线阵列在未来卫星通信领域具有潜在的应用价值。

关 键 词：array antenna nematic liquid crystals electronically beam scanning field programmable gate array(FPGA) 

分 类 号：O441.4[理学—电磁学] TN929.5[理学—物理]