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<p>This paper proposes a compact, low-profile, two-port MIMO antenna for portable devices operating in next-generation 5G wireless networks. The proposed design consists of two semi-circular radiating elements on FR4 substrate (<i>ε</i><sub><i>r</i></sub> = 4.4 and <i>h</i> = 1.6&#xa0;mm). The overall antenna size is 0.40λ × 0.32λ (50&#xa0;mm × 20&#xa0;mm) at a center frequency of 4.85&#xa0;GHz. A key innovation is the incorporation of complementary split-ring resonators (CSRR) in the ground plane, which significantly enhances isolation between the antenna elements. The CSRR technique effectively mitigates mutual coupling, achieving an isolation level below − 15dB, which is critical for MIMO systems to maintain signal integrity and reduce inter-port interference. The proposed antenna offers a broad 47% impedance bandwidth, covering 3.7–6&#xa0;GHz. This wide bandwidth enables support for various communication standards, including the 5G N79 band, WLAN 4.9–5.0&#xa0;GHz, and Wi-Fi 5&#xa0;GHz. Experimental results closely match the simulated data, demonstrating good return-loss performance, high diversity gain over 9.9dB, and a low envelope correlation coefficient below 0.005, ensuring efficient MIMO operation by minimizing inter-port interference. The omnidirectional radiation patterns across the XZ- and YZ-planes further validate the antenna’s ability to provide stable and uniform coverage.</p>

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Compact low-profile multiple-input multiple-output (MIMO) antenna for portable devices in next-generation 5G wireless networks

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • Nathirulla Sheriff,
  • Arshad Karimbu Vallappil,
  • Sharul Kamal A. Rahim,
  • Bilal A. Khawaja,
  • Tan Kim Geok,
  • Adnan Iftikhar,
  • Muhammad Uzair

摘要

This paper proposes a compact, low-profile, two-port MIMO antenna for portable devices operating in next-generation 5G wireless networks. The proposed design consists of two semi-circular radiating elements on FR4 substrate (εr = 4.4 and h = 1.6 mm). The overall antenna size is 0.40λ × 0.32λ (50 mm × 20 mm) at a center frequency of 4.85 GHz. A key innovation is the incorporation of complementary split-ring resonators (CSRR) in the ground plane, which significantly enhances isolation between the antenna elements. The CSRR technique effectively mitigates mutual coupling, achieving an isolation level below − 15dB, which is critical for MIMO systems to maintain signal integrity and reduce inter-port interference. The proposed antenna offers a broad 47% impedance bandwidth, covering 3.7–6 GHz. This wide bandwidth enables support for various communication standards, including the 5G N79 band, WLAN 4.9–5.0 GHz, and Wi-Fi 5 GHz. Experimental results closely match the simulated data, demonstrating good return-loss performance, high diversity gain over 9.9dB, and a low envelope correlation coefficient below 0.005, ensuring efficient MIMO operation by minimizing inter-port interference. The omnidirectional radiation patterns across the XZ- and YZ-planes further validate the antenna’s ability to provide stable and uniform coverage.