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A small‐size four‐element antenna system for 2 × 2 LTE low band (LB, 698‐960 MHz) and 4 × 4 LTE middle/high band (M/HB, 1710‐2690 MHz) multiple‐input multiple‐output (MIMO) operations in 5G (fifth‐generation) mobile terminals is presented. The proposed antenna system is formed by two identical tunable loop antennas and two identical coupled‐fed IFA (Inverted‐F Antenna) antennas. By loading a RF switch...
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