Continuous Rapid-Beam-Scanning and Circular-Polarized Leaky⁃Wave Antenna Based on Meandering-SIW with Defected Ground Structures  

基于曲折SIW与缺陷地结构的连续快速波束扫描圆极化漏波天线

作　　者：RUAN Yizheng NIU Zhenyi CHEN Weikang ZHAO Yongjiu PAN Shilong 阮一铮;牛臻弋;陈伟康;赵永久;潘时龙(南京航空航天大学微波光子技术国家级重点实验室,南京211106)

机构地区：[1]National Key Laboratory of Microwave Photonics,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2025年第1期80-89,共10页南京航空航天大学学报(英文版)

摘　　要：A compact high-scanning-rate circular-polarized leaky-wave antenna(LWA)based on a meandering substrate integrated waveguide(SIW)with defected ground structures(DGSs)is presented.The meandering-SIW design is employed to enhance the beam scanning rate,while circular polarization is achieved by etchingπ-shaped slots on the top plane.To suppress the open stopband at broadside,offset circular DGSs are periodically etched on the ground plane.Their impact on the reflection coefficient and axial ratio is then analyzed through a parametric study.A prototype of the antenna is simulated,fabricated,and measured.Both simulated and measured results indicate a scanning rate of approximately 8.6,with continuous beam scanning from-41°to 59°across the 11.3-12.7 GHz operating band.The antenna maintains an axial ratio below 3 dB within the 11.5-12.3 GHz range.This design shows promise for use in wireless communication systems,particularly in environments with increasingly limited spectrum resources.提出了一种基于曲折基片集成波导(Substrate integrated waveguide,SIW)和缺陷地结构(Defected ground structures,DGSs)的紧凑型高扫描速率圆极化漏波天线(Leaky-wave antenna,LWA)。该设计通过引入曲折形SIW结构提升波束扫描速率,并利用顶部金属层刻蚀的π形缝隙实现圆极化辐射。为有效抑制宽边辐射时的开阻带效应,在地平面周期性刻蚀偏置圆形DGSs单元,并通过参数化研究系统揭示了缺陷地结构对天线反射系数和轴比特性的调控机制。最后对天线原型进行仿真、加工及测试,结果表明:在11.3~12.7 GHz工作频段内,波束可实现-41°至59°的连续扫描,扫描速率达到8.6;在11.5~12.3 GHz频段内天线轴比保持在3 dB以下。该设计在频谱资源日益受限的无线通信系统中展现出显著应用价值。

关 键 词：leaky-wave antenna(LWA) scanning rate circular polarization open stopband defected ground structure(DGS) 

分 类 号：TN825[电子电信—信息与通信工程]