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<p>This article presents a compact hybrid MIMO antenna that combines both linear and circular polarization, integrating ultra-wideband (UWB) and millimeter-wave (mmWave) elements within the same package on a multi-layer substrate. A circularly polarized mmWave MIMO array is positioned at the center using an aperture-coupled configuration, while four UWB elements are placed diagonally on the same plane. The mmWave antenna employs a parallel-oriented magneto-electric (ME) dipole design to achieve right-hand circular polarization. A Z-shaped slot in the shared ground layer enhances the impedance bandwidth and simultaneously limits surface current coupling, which improves isolation between the ports. Experimental results from the fabricated prototype show that the antenna achieves a −10 dB impedance bandwidth of 84.3% for the UWB section (3.28–8.06 GHz) and 61.4% for the mmWave section (21.2–40 GHz), with realized gains ranging from 1 to 5.7 dBi for UWB and 7.4 to 12 dBi for mmWave. Additionally, a 3 dB axial ratio bandwidth of 51% is achieved across 22.2 to 37.5 GHz. With its wide operating bandwidth, compact design, and consistent radiation characteristics, the proposed antenna is well-suited for modern wireless applications spanning multiple UWB and mmWave frequency bands, including n46, n47, n96, n102, n104, n257, n258, n259, and n260.</p>

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Integrated Linear and Circular Polarized Multi-radiator UWB-mmWave Hybrid MIMO Antenna in a Single Package with Layered Ground Structure

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • Prabir Ghosh,
  • Abhik Gorai,
  • Subhrakanta Behera,
  • Rowdra Ghatak

摘要

This article presents a compact hybrid MIMO antenna that combines both linear and circular polarization, integrating ultra-wideband (UWB) and millimeter-wave (mmWave) elements within the same package on a multi-layer substrate. A circularly polarized mmWave MIMO array is positioned at the center using an aperture-coupled configuration, while four UWB elements are placed diagonally on the same plane. The mmWave antenna employs a parallel-oriented magneto-electric (ME) dipole design to achieve right-hand circular polarization. A Z-shaped slot in the shared ground layer enhances the impedance bandwidth and simultaneously limits surface current coupling, which improves isolation between the ports. Experimental results from the fabricated prototype show that the antenna achieves a −10 dB impedance bandwidth of 84.3% for the UWB section (3.28–8.06 GHz) and 61.4% for the mmWave section (21.2–40 GHz), with realized gains ranging from 1 to 5.7 dBi for UWB and 7.4 to 12 dBi for mmWave. Additionally, a 3 dB axial ratio bandwidth of 51% is achieved across 22.2 to 37.5 GHz. With its wide operating bandwidth, compact design, and consistent radiation characteristics, the proposed antenna is well-suited for modern wireless applications spanning multiple UWB and mmWave frequency bands, including n46, n47, n96, n102, n104, n257, n258, n259, and n260.