一种双圆极化超表面天线设计  

Dual-circularly Polarized Metasurface Antenna Design

作　　者：刘巾军 李梦洁 施秉权 杨国[3] 齐世山 LIU Jinjun;LI Mengjie;SHI Bingquan;YANG Guo;QI Shishan(The Fourth Military Representative Ofice of the Military Representative Bureau of the Army Armament Department in Nanjing,Nanjing 210024,China;The 58th Research Institute of China Electronics Technology Group Corporation,Wuxi 214035,China;Key Laboratory of Near-range RF Sensing ICs&Microsystems(NJUST),Ministry of Education,School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]陆军装备部驻南京地区军事代表局驻南京地区第四军事代表室,南京210024 [2]中国电子科技集团公司第五十八研究所,无锡214035 [3]南京理工大学电子工程与光电技术学院,近程射频感知芯片与微系统教育部重点实验室,南京210094

出　　处：《微波学报》2025年第2期67-71,78,共6页Journal of Microwaves

基　　金：国家自然科学基金(62271257)。

摘　　要：双圆极化天线凭借其能够有效减小多径效应、减少极化损耗、增大信道容量等优势,在无线通信领域被广泛使用。文中提出了一种双圆极化超表面天线,并给出了修正超表面结构实现圆极化性能的设计流程。首先通过特征模分析原始超表面结构本身的物理属性,根据特征电流分布改变超表面的结构,在工作频带内得到两个简并的特征模式;其次在选定的位置放置交叉垂直的微带馈线,利用槽耦合馈电的方式激励具有90°的相位差以及相同激励幅度的两个简并模式,从而实现双圆极化辐射。最终设计的天线测试的端口1和端口2轴比带宽分别为24.8%和20.2%,实现了较好的双圆极化辐射。此外,两个端口的测试增益都在5 dBi左右,在带内具有稳定的辐射增益。Dual-circularly polarized antennas are widely used in the field of wireless communication due to their advantages of effectively reducing multipath effects,reducing polarization losses and increasing channel capacity.In this paper,a dual-circularly polarized metasurface antenna is proposed and it provides a design procedure for modifying the metasurface structure to achieve cir-cular polarization performance.Firstly,the physical properties of the original metasurface structure are analyzed using characteris-tic mode analysis.Based on the distribution of characteristic currents,the metasurface structure is modified to obtain two degener-ate characteristic modes within the operating frequency band.Secondly,cross-shaped microstrip feedlines are strategically posi-tioned and fed using slot-coupling to excite the two degenerate modes with a phase difference of 90 degrees and equal excitation am-plitudes,thereby achieving dual circular polarization radiation.The antenna exhibits a measured axial ratio bandwidth of 24.8%and 20.2%at the port-1 and port-2,respectively,indicating excellent dual circular polarization radiation.Additionally,both ports exhibit a stable radiation gain of around 5 dBi within the operating band.

关 键 词：无线通信 特征模理论 双圆极化天线 超表面天线 

分 类 号：TN821.1[电子电信—信息与通信工程]