In this paper, the systematic design of a multiple antenna system for 5G smartphone\noperating at 3.5 GHz for multiple-input multiple-output (MIMO) operation in smartphones is\nproposed. The smartphone is preferred to be lightweight, thin, and attractive, and as a result metal\ncasings have become popular. Using conventional antennas, such as a patch antenna, Inverted-F\nantennas, or monopole, in proximity to metal casing leads to decreasing its total efficiency and\nbandwidth. Therefore, a slot antenna embedded in the metal casing can be helpful, with good\nperformance regarding bandwidth and total efficiency. The proposed multiple antenna system\nadopted the unit open-end slot antenna fed by Inverted-L microstrip with tuning stub. The measured\nS-parameters results agree fairly with the numerical results. It attains 200 MHz bandwidth at 3.5 GHz\nwith ports isolation ....................
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