基于人工电磁表面的超低剖面全介质透镜天线

An Ultra Low-Profile All-Dielectric Lens Antenna Based on Metasurface

利用不同厚度的亚波长介质块实现0~2π的相位变化,并基于惠更斯人工电磁表面原理设计了工作于28 GHz通信频段的全介质电磁透镜,该电磁透镜的焦距与口径比（F/D）为0.15。通过3D打印制备该电磁透镜,并将其与基片集成波导（SIW）贴片天线进行集成,构造了超低剖面的宽带透镜天线。全波分析与实验测量结果显示该电磁透镜能够将原SIW贴片天线的增益提高7 d B左右,而将3 d B波束宽度减小到10°左右,同时该透镜天线系统还具有良好的低副瓣。

In this paper, subwavelength dielectric blocks with varying thicknesses are introduced to realize 0 - 2π phase change. Based on Huygens metasurface principle, such nonuniform building blocks are used to design an electrically- thin all-dielectric electromagnetic （EM） lens operated at 28 GHz communication band. The ratio of the focal length to aper- ture diameter （F/D） of the lens is 0. 15. The EM lens is fabricated by a three-dimensional （3D） printer, and is integrated with a substrate-integrated waveguide （SIW） patch antenna to form an ultra low-profile lens antenna system. Both the simu- lated and measured results show that the all-dielectric lens can lead to about 7 dB gain increment and the great reduction of the 3 dB beamwidth, as well as very low side-lobe levels.