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A broadband 8-antenna multiple-input and multiple-output (MIMO) system working for 5G new radio N77 (3.3-4.2 GHz) in mobile terminals is proposed. In particular, each antenna element/unit consists of a monopole-type meandered branch and an inverted U-shaped self-isolated antenna branch; and the antenna unit is fed by the meandered branch. The antenna unit has two resonances generated separately by each branch of the antenna unit. Since the monopole couples strongly with the self-isolated antenna element that has the inherent self-isolation characteristics, quite good isolation for the broadband 8-antenna MIMO system can be obtained. The results such as antenna efficiency, radiation patterns, envelope correlation coefficient, and channel capacity are also presented.
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Zhao et al. (2019) studied this question.
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