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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 mm 2. A Fabry–Perot cavity is created by positioning this metasurface at approximately 0.5 λ 0 (where λ 0 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 20. 5 × 20. 6 × 0. 508 mm 3 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. [ABSTRACT FROM AUTHOR]