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Experimental design demonstrates high gain and enhanced isolation in a millimeter-wave 2x2 MIMO antenna, suggesting suitability for 28 GHz fifth-generation networks.
In this paper, a 2 × 2 MIMO antenna with inset feed is designed for the frequency Range 2 (FR2) millimeter wave frequencies such as n257 (26-29.5 GHz), n258 (24.25-27.5 GHz), and n261 (27.5–28.35 GHz). The MIMO antenna is designed and fabricated using low loss Rogers RT/duroid 5880 substrate having dimension of 1.4λ₀ × 2.8λ₀×$0.073 $λ₀$, where $λ₀$ is the free-space wavelength operating at 28 GHz.The defected ground structure (DGS) minimized the surface waves current. Thus DGS are used to increased the gain and the isolation of the proposed MIMO antenna design. The gain of the MIMO antenna reported is 10.3 dBi with 97.01% radiation efficiency at 28 GHz resonant frequency. The -10 dB impedance bandwidth lies between 26.95-29.50 GHz, which covers the 5G frequency bands. The isolation is ≥ 28 dB and envelope correlation coefficient (ECC) is 10 ⁻⁵, respectively, in the complete operating band.
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Pant et al. (2024) studied this question.
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