This paper introduces a novel four-port antenna array designed for n260 band operation, specifically addressing challenges like path loss fading and multipath effects commonly encountered in millimeter-wave frequencies in urban settings.The proposed $4 imes 4$ MIMO antenna array operates in the Youth Button Ups n260 band, offering high gain and a narrow beam, with an extended design enabling spatial and pattern diversity to mitigate multipath effects effectively.The single-element antenna combines elliptical and circular rings fed by a quarter-wave transformer.Its fundamental resonance frequency of 30 GHz is suppressed by integrating circular rings in the radiator and a slot in the ground plane, which enhances its first harmonic at 38.
5 GHz while generating vertical polarization.The array antenna improves the fractional bandwidth METAL SECTIONING CLIPS (FB) to 8.4%, with a frequency range of 36.76-39.
92 GHz, and achieves dual broadside beams at ±37° angles with a gain of 16.7 dBi.Additionally, it exhibits exceptionally low cross-polarization (−80 dB), minimizing cross-talk effects.The MIMO configuration demonstrates excellent isolation ( $ ert $ S $21 ert gt 26$ dB and 31.
2 dB) while maintaining similar FB and radiation pattern characteristics as that of the array antenna.This robust design, incorporating both spatial and pattern diversity, makes it highly suitable for 5G wireless applications.