Orthogonal eight-element MIMO antenna for dual-band 28/38 GHz mmWave communications
Ahmad J. Abzhanova D. Hashmi M.
March 2026Elsevier B.V.
Results in Engineering
2026#29
A critical challenge in realizing high-performance multiple-input multiple-output (MIMO) systems at millimeter-wave (mmWave) frequencies is mutual coupling. This paper presents a compact eight-element MIMO antenna operating at 28 GHz and 38 GHz that effectively suppresses mutual coupling without requiring any additional decouplers. The design begins with a slotted patch element and then by arranging eight such elements in an orthogonal configuration, spatial diversity is exploited to achieve strong isolation and pattern diversity. The MIMO antenna has dimensions of only 33.8 × 33.8 mm2 (3.16×3.16λ02 at 28 GHz and 4.29×4.29λ02 at 38 GHz). Measured results validate dual-band performance with impedance bandwidths of 26–29 GHz (fractional bandwidth 10.9%) and 36.07–39.1 GHz (fractional bandwidth 8.1%), peak realized gains of 5.88 dBi and 4.89 dBi, and port isolation more than 25 dB and 20 dB at 28 GHz and 38 GHz, respectively. Excellent MIMO diversity performance is confirmed by envelope correlation coefficient (ECC) < 0.05, diversity gain (DG) > 9.90 dB, and total active reflection coefficient (TARC) less than - 10 dB across both bands. System-level evaluations of channel capacity, link margin, and received power further demonstrate the practical viability of the proposeed MIMO design. With its compact size, self-decoupled design, and good diversity characteristics, the proposed MIMO antenna is suitable for integration into mmWave 5G mmWave compact user terminal and phased array systems.
Antenna diversity , Dual-band , MIMO Antenna , Mmwave , Mutual coupling
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Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Qabanbay Batyr, Astana, 10000, Kazakhstan
Department of Electrical and Computer Engineering
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026