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This design presents a compact microstrip patch antenna array for MIMO IoT applications, indicating effective integration into 5G devices.
This paper presents a compact microstrip patch antenna array for multiple-input-multiple-output (MIMO) Internet of Things (IoT) applications. The proposed MIMO antenna is designed for 5G New Radio (NR) working at FR1 (Sub-6 GHz) allocated band. For an ease of integration into compact IoT devices, the proposed design employs a quarter-wavelength patch with sided slots and stubs. An I-shaped defected ground structure (DGS) is inserted between the MIMO elements for coupling reduction. The final 2-port MIMO antenna with overall compact size of 0.36λ × 0.36 λ × 0.02 λ has operating bandwidth from 3.55 to 3.60 GHz. Throughout this band, the isolation is consistently better than 24 dB, and the broadside gain exceeds 2.4 dBi. The antenna can be used for compact IoT devices working at sub-6 GHz fifth generation (5G) band.
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Hoang-Thi et al. (2025) studied this question.
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