Design and Analysis of a Quad‐Port Dual‐Band MIMO Antenna for Submillimeter and Millimeter Wave 5G Applications

Abstract

ABSTRACT This article demonstrates the design and analysis of a dual‐band quad‐element MIMO antenna optimized for 5G new radio frequency range (FR)‐2 applications. Constructed on a Rogers 5880 substrate with a relative permittivity of 2.2, the antenna features compact dimensions of 18.8 mm × 18.02 mm × 0.79 mm (1.484 λ L × 1.42 λ L × 0.062 λ L , corresponding to the lower cut‐off frequency) for a quad‐element MIMO configuration, offering economic and space‐saving advantages. A key challenge in millimeter‐wave MIMO antenna design is mitigating mutual coupling while ensuring wideband operation, high gain, and efficiency in a compact form factor. To address this, each antenna element integrates a stub and parasitic element on the top layer, complemented by a rectangular slot on the bottom layer, enhancing isolation and impedance matching. The proposed MIMO antenna achieves resonance across dual bands of 23.68–31.92 GHz and 33.74–41.16 GHz, demonstrating excellent agreement between simulated and measured results. It attains a peak gain of 9.2 dBi with a directional radiation pattern and a high radiation efficiency of 93.4%. Furthermore, it exhibits superior MIMO diversity performance with ECC < 0.01, DG > 9.96 dB, −11 dB < MEG < −4 dB, and TARC < 10 dB across the operating bands, making it a strong candidate for 5G NR257, NR258, NR260, NR261, and other sub‐mm‐wave wireless applications.