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This letter presents a compact circularly polarized dual wide-bands twelve port multiple-input–multiple-output antenna for mobile terminal communications. It can be fitted into a smartphone as a back cover without occupying internal space. A single antenna module consists of a coaxial line feed port and a radiation patch with dimensions of 0.484λ ₀ × 0.591λ ₀× 0.0203λ ₀(whereλ ₀is the free-space wavelength at 5 GHz). The measurement results indicate −6 dB bandwidths of 1.1 GHz (2.1 GHz to 3.2 GHz) and 0.5 GHz (5 GHz to 5.5 GHz), respectively. Significant isolation≥18 dB, improved gain, and efficiency are achieved due to the introduction of the coronary stent-shaped-inspired metamaterial. The envelope correlation coefficient, the ratio of mean effective gains, and the efficiency are measured to be below 0.05, within 1 dB, and≥90%, respectively. It also considers how the human hands impact the antenna's function. It operates over long-term evolution (LTE Band-1), LTE Band-40, worldwide interoperability for microwave access, LTE Band 41, NR Band n77, Wi-Fi 5 (802.11ac), Wi-Fi 6 (802.11ax), and NR Band n258.
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Khan et al. (2025) studied this question.
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