In this paper, a novel metasurface-based Fabry−Perot cavity antenna loaded with toroidal metal structures is presented. The antenna is compact, wideband, and has high directivity and a high front-to-back ratio. The idea of the antenna is based on loading a microstrip narrow band patch antenna resonating at 4.5 GHz by a single layer metasurface superstrate and with a toroidal metal structure. The metasurface superstrate comprises a periodic array of square patch cells. Compared to conventional microstrip antenna, the front to back lobe ratio is increased from 7 to 20 dB and the directivity is increased by 7 dB. Also, the antenna impedance bandwidth is 34% which is increased four times. This is the first-ever antenna with enhanced bandwidth and directivity using a single layer of metasurface and that too made up of periodic cell array and has application as an energy harvester.

在本文中，提出了一种新型的基于超表面的法布里-珀罗腔天线，该天线加载了环形金属结构。该天线结构紧凑、带宽大、方向性强、前后比高。天线的想法是基于加载一个在 4.5 GHz 谐振的微带窄带贴片天线，通过单层超表面覆板和环形金属结构。超表面覆层包括方形贴片单元的周期性阵列。与传统微带天线相比，前后瓣比从7dB提高到20dB，方向性提高7dB。此外，天线阻抗带宽为 34%，增加了四倍。