A compact integrated tri-band antenna for Sub-6GHz and millimeter wave (mmW) 5G mobile devices is developed. The antenna comprises a multiple-input-multiple-output (MIMO) antenna pair consisting of two symmetric inverted-F antenna (IFA) units and five split ring resonator antenna (SRRA) units. The inserted SRRA units serve the dual-purpose of forming a mmW array and mitigating mutual coupling among the IFA units at 3.5 GHz. The antenna covers a small area of 39.48 × 5.7 mm 2 and can operate in three bands: 3.29-3.79, 4.79-4.92 and 24.15-29.58 GHz. The tri-band antenna might be a promising choice for 5G mobile devices.
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Hu et al. (2024) studied this question.
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