基于支节容性加载的小型化低剖面超表面天线

摘要

本文对容性支节加载的小型化超表面天线进行了分析与设计.通过在方形贴片上引入一对容性负载支节,可以有效地降低超表面单元的工作频率,从而将传统方形贴片超表面单元的尺寸减小55％.在单元设计的基础上,设计了一款4×4阵列的超表面天线,并采用特征模分析(CMA)解释了超表面天线的辐射机制.为了验证设计思路,对天线进行了加工和测试,测量的-10 d B阻抗带宽为21.7％,并在工作频带内保持6 d Bi的辐射增益.%A miniaturized metasurface antenna using capacitive loading is investigated. First, anovel miniaturized metasurface unit cell is proposed.By introducing a pair of capacitive-loading strips inserted along the diagonal of a square patch, a size reduction of 55％ can be achieved for this miniaturized unit cell.Furthermore, a compact metasurface antenna of a 4×4 array is designed using the miniaturized unit cells, which is fed by a slot structure.The radiation mechanism of the metasurface antenna is revealed and explained using a characteristic mode analysis (CMA).To validate the design, a prototype of the proposed antenna is fabricated and measurements are taken.The measured-10 dB impedance bandwidthis 21. 7％, while a gain of 6 dBi is observed within the operating bandwidth.