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<p>This article presents a broadband circularly polarized four-port multiple-input–multiple-output (MIMO) antenna with high isolation is presented in this article. The proposed MIMO antenna consists of four octal-shaped monopole antennas with common ground is realized and fabricated on FR-4 (ε<sub>r</sub> = 4.3) substrate with a thickness of&#xa0;1.6 mm and a size of 140 mm × 140 mm. Measurement results of the presented MIMO antenna show&#xa0; features of a wide impedance bandwidth (IBW) of 139.39% (2–11.2 GHz)&#xa0;and&#xa0; a 3-dB axial ratio bandwidth (ARBW) of 91.95% (2.25–6.4 GHz) with simple and economical fabrication. Additionally, the investigated MIMO antenna has high isolation (S21 &lt; -21.8 dB) and a peak gain of 7.88 dBi within the ultra-wideband (UWB) spectrum. It is a&#xa0;promising candidate for UWB MIMO communication systems and 5G wireless communications.</p>

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High Performance Circularly Polarized Quad-Elements for 5G Wireless Communications

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月3日

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  • Rehab I. Nawar,
  • Abdelhady M. Abdelhady,
  • Ashraf Y. Hassan

摘要

This article presents a broadband circularly polarized four-port multiple-input–multiple-output (MIMO) antenna with high isolation is presented in this article. The proposed MIMO antenna consists of four octal-shaped monopole antennas with common ground is realized and fabricated on FR-4 (εr = 4.3) substrate with a thickness of 1.6 mm and a size of 140 mm × 140 mm. Measurement results of the presented MIMO antenna show  features of a wide impedance bandwidth (IBW) of 139.39% (2–11.2 GHz) and  a 3-dB axial ratio bandwidth (ARBW) of 91.95% (2.25–6.4 GHz) with simple and economical fabrication. Additionally, the investigated MIMO antenna has high isolation (S21 < -21.8 dB) and a peak gain of 7.88 dBi within the ultra-wideband (UWB) spectrum. It is a promising candidate for UWB MIMO communication systems and 5G wireless communications.