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Experimental study demonstrates high isolation and diversity gain in a metasurface MIMO antenna, suggesting suitability for sub-6 GHz 5G devices.
In this paper, a metasurface-based multiple-input multiple-output (MIMO) antenna with high isolation between antenna elements is presented. The main patch radiator is sandwiched between a metasurface and a ground plane to achieve performance enhancement. The fabricated single element antenna has a compact size of 0.85λ0×0.85λ0×0.038λ0. The antenna exhibits a wideband operational bandwidth from 3.27 to 3.82 GHz for |S11|0×1.75λ0×0.038λ0. The proposed 4 port ( 2×2) MIMO antenna provides 15.9% of 10 dB impedance bandwidth from 3.3 to 3.87 GHz with a peak gain of 8.72 dBi. Moreover, the proposed MIMO antenna offers excellent diversity performance, isolation between antenna elements is very high (>32dB), ECC is lower than 0.001, and diversity gain is 9.99 dB very close to the ideal value of 10dB. Owing to these features, the proposed MIMO antenna can be a good candidate for 5G Sub-6 GHz (n78 band) smart devices and sensors.
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Sufian et al. (2021) studied this question.
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