This article presents an efficient ultra-miniaturized metasurface-based antenna array with high gain and wider bandwidth for millimeter-wave applications. The presented 1 × 2 compact array incorporates two patches with rectangular slots for gain, impedance matching, and bandwidth enhancement. Further performance is improved by designing a single-layer compact reflecting metasurface with a 2 × 4 array of diamond-shaped split-ring unit cells, where each unit cell has a compact size of only 1.35 × 1.35 . A Fabry–Perot cavity is created by positioning this metasurface at approximately 0.5 (where is the wavelength in millimeters) above the antenna array. This integration allows for improved performance and reduced interference between the metasurface and the antenna array. Moreover, the proposed configuration has achieved a wider bandwidth of 5.96 GHz (27.38–33.34 GHz), a maximum gain of around 12.7 dBi, and a radiation efficiency of 94% despite its miniaturized size. The design is validated by testing the fabricated prototypes. Compared to state-of-the-art literature, the proposed design renders itself a feasible solution for millimeter wave communication devices and systems owing to its smaller physical footprint, broader bandwidth, higher gain, and improved radiation efficiency.

中文翻译：

---

基于超表面的天线阵列，提高了毫米波应用的性能

本文介绍了一种高效的超小型超表面天线阵列，具有高增益和更宽的带宽，适用于毫米波应用。所提出的 1 × 2 紧凑阵列包含两个带有矩形槽的贴片，用于增益、阻抗匹配和带宽增强。通过设计具有 2 × 4 菱形裂环晶胞阵列的单层紧凑反射超表面，进一步提高了性能，其中每个晶胞的紧凑尺寸仅为 1.35 × 1.35 。法布里-珀罗腔是通过将该超表面放置在天线阵列上方约 0.5（其中波长以毫米为单位）处而创建的。这种集成可以提高性能并减少超表面和天线阵列之间的干扰。此外，尽管尺寸较小，但所提出的配置实现了 5.96 GHz（27.38-33.34 GHz）的更宽带宽、约 12.7 dBi 的最大增益以及 94% 的辐射效率。通过测试制造的原型来验证设计。与最先进的文献相比，所提出的设计因其更小的物理占地面积、更宽的带宽、更高的增益和更高的辐射效率而成为毫米波通信设备和系统的可行解决方案。