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<p>This paper presents a four-element millimeter wave (mmwave) wideband, high-gain, and high-isolated MIMO (multiple-input multiple-output) antenna system. Firstly, a single-element antenna is designed with a slotted circular-shaped patch and half ground plane, aiming to get a wideband mmwave antenna. The same four single elements are then placed orthogonal to each other in a MIMO setup. The MIMO antenna system is compact, with a total size of 25.02 × 25.02 × 0.508 mm<sup>3</sup>. The substrate used for the design is Rogers RT5880, with a thickness of 0.508, permittivity of 2.2, and loss tangent of 0.0009. The results achieved are bidirectional radiation patterns with a peak gain of 7.8&#xa0;dB, high radiation efficiency of 93%, and high isolation among the arrays, which range from 20 to 38&#xa0;dB over the entire wide operating bandwidth from 24 to 42&#xa0;GHz. The results are verified from its prototype measurements, which show good agreement with the simulated results. The proposed MIMO array antenna system is aimed to be used in wideband mmwave applications, specifically in Internet of Things (IoTs) applications.</p>

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Compact Wideband 4-Port MIMO Antenna System Design with Improved Inter-Elements Isolation Characteristics

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • Ijaz Ahmad,
  • Yuhuai Liu,
  • Fang Wang,
  • Muhammad Kazim Khan,
  • Mian Muhammad Kamal

摘要

This paper presents a four-element millimeter wave (mmwave) wideband, high-gain, and high-isolated MIMO (multiple-input multiple-output) antenna system. Firstly, a single-element antenna is designed with a slotted circular-shaped patch and half ground plane, aiming to get a wideband mmwave antenna. The same four single elements are then placed orthogonal to each other in a MIMO setup. The MIMO antenna system is compact, with a total size of 25.02 × 25.02 × 0.508 mm3. The substrate used for the design is Rogers RT5880, with a thickness of 0.508, permittivity of 2.2, and loss tangent of 0.0009. The results achieved are bidirectional radiation patterns with a peak gain of 7.8 dB, high radiation efficiency of 93%, and high isolation among the arrays, which range from 20 to 38 dB over the entire wide operating bandwidth from 24 to 42 GHz. The results are verified from its prototype measurements, which show good agreement with the simulated results. The proposed MIMO array antenna system is aimed to be used in wideband mmwave applications, specifically in Internet of Things (IoTs) applications.