宽带平面聚焦超表面及高增益天线应用  

Wideband flat focusing metasurfaces for electromagnetic wave and its application in high-gain antenna

作　　者：李聪 陈明 王开开 邢琼 LI Cong;CHEN Ming;WANG Kaikai;XING Qiong(School of Electronic Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,China)

机构地区：[1]西安邮电大学电子工程学院

出　　处：《电子元件与材料》2019年第11期84-88,共5页Electronic Components And Materials

基　　金：西安邮电大学研究生创新基金(CXJJLY2018025,CXJJLY2018026)

摘　　要：针对现有的聚焦超表面存在介质层数多、带宽窄的问题,提出了一种基于双层介质的宽带聚焦超表面,该超表面包含两层正交的金属栅格和一层金属箭头贴片,以此实现极化旋转功能,可在较宽的频带内提高天线增益.在9~12GHz的频带范围内,使用一个F形微带贴片天线作为馈源,验证了提出的平面透镜的宽带波束聚焦能力.仿真结果表明,当加入聚焦超表面后,天线增益在11GHz处达到最大值18.4dB,在工作带宽内馈源天线的增益提高了8.95~11.04dB.由于结构简单、频带宽,设计的聚焦超表面在控制电磁波和设计高增益天线方面有很大的应用潜力.In view of the disadvantages of existing focusing metasurfaces, such as the large number of dielectric layers and narrow bandwidth, a broadband focusing metasurface based on double-layer dielectric was proposed. The metasurface contains two orthogonal metal grids and a metal arrow patch, which can realize polarization conversion and improve antenna gain in a wide bandwidth. An F-shaped microstrip patch antenna was used as a feedback in the 9-12 GHz band to verify the broadband beam focusing capability of the proposed planar lens. The simulation results show that when the focusing metasurface is added, the antenna gain reaches 18. 4 dB at 11 GHz, and the gain of the feed antenna increases by 8. 95-11. 04 dB in the working bandwidth. Due to its simple structure and wideband, the designed metasurface has great potential for controlling electromagnetic waves and designing high- gain antennas.

关 键 词：聚焦 宽带 双层介质 超表面 高增益天线 

分 类 号：TN820[电子电信—信息与通信工程]