应用于Wi-Fi通信的超表面圆极化天线  

A metasurface circularly polarized antenna for Wi-Fi communication

作　　者：郭华 王浩然 刘聪聪 苟慧玲 仇晓茹 杨昕悦 GUO Hua;WANG Haoran;LIU Congcong;GOU Huiling;QIU Xiaoru;YANG Xinyue(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China;Shaanxi Provincial Experimental Teaching Demonstration Center,Xi’an 710121,China)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]陕西省电工电子实验教学示范中心,陕西西安710121

出　　处：《西安邮电大学学报》2025年第2期57-65,共9页Journal of Xi’an University of Posts and Telecommunications

基　　金：陕西省创新能力支撑计划项目(2023HBGC-43)。

摘　　要：针对低剖面Wi-Fi通信天线的宽带圆极化问题,设计一款基于超表面的低剖面宽带圆极化天线。通过特征模原理进行分析,基于基础的切角圆极化贴片超表面,利用角缝隙、单元间枝节等微扰,优化超表面模式,设计出3种工作在不同频点的极化转化超表面结构。对于不同结构的超表面,通过缝隙耦合方式馈电,获得低剖面的宽带圆极化天线。再对不同结构的超表面进行非均匀分布,将轴比下陷点和谐振频点进行融合,获得更高的阻抗带宽和轴比带宽。天线在拓宽带宽的基础上同时缩小结构尺寸,实现天线的宽带化和小型化。仿真结果表明,天线的阻抗带宽为46.6%(3.82~6.16 GHz),天线的轴比带宽为26.9%(4.63~6.07 GHz)。与相关方法相比,所提设计具有谐振频点低、尺寸小、重叠带宽较宽的优势,适用于Wi-Fi通信和部分C波段卫星通信。For the wideband circular polarization problem in low-profile Wi-Fi communication antennas,a metasurface-based low-profile wideband circularly polarized antenna is designed.With the analysis on the principle of characteristic mode,and based on basic tangential circularity polarized patch metasurface,three metasurfaces operating at different frequency points for polarization conversion are designed with the angular slots,the perturbations of inter-element branches,etc.to optimize the metasurface modes.By using slot coupling for feeding,low-profile wideband circularly polarized antennas are obtained for metasurfaces with different structures.Then the non-uniform distribution is applied to the metasurfaces with different structures to obtain higher impedance bandwidth and axial ratio bandwidth with the fusion of the axial ratio sinking points and the resonant frequency points.The antenna achieves both size reduction and bandwidth extension,which enables a compact and broadband design.Simulation results show that the antenna has an impedance bandwidth of 46.6%(3.82~6.16 GHz),and an axial ratio bandwidth of 26.9%(4.63~6.07 GHz).Compared to the related methods,the proposed design offers advantages in terms of low resonant frequency,small size,and wider overlapping bandwidth,which is suitable for Wi-Fi communication and part of the C-band satellite communication.

关 键 词：圆极化天线 宽带天线 低剖面 超表面 特征模分析 无线通信 

分 类 号：TN822.8[电子电信—信息与通信工程]