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In this paper, a high‐isolation eight‐unit multiple‐input multiple‐output (MIMO) array is proposed, which applies to future smartphones with unbroken metal frames. Two types of elements (inverted H‐shaped slot antenna [IHSA] and modified top‐loaded monopole [MTLM]) are adopted to realize low mutual coupling, and the detailed decoupling mechanism is also presented. The IHSA with a better‐reduced ground...