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<p>This article presents a design of a&#xa0;four-port MIMO antenna to support dual circular polarization (CP) for Sub-6&#xa0;GHz and WiFi-6E bands while emphasizing polarization diversity. The MIMO antenna comprises four elements, two configured for left-hand circular polarization (LHCP) and the&#xa0;other two for right-hand circular polarization (RHCP). To achieve circular polarization in each antenna element, a stub-loaded microstrip feed line and&#xa0;a slotted ground plane featuring a rectangular slot and a triangular stub are utilized. The antenna design features a compact form factor with dimensions of (0.63 × 0.63 × 0.019) λ<sub>0</sub>. It exhibits an impedance bandwidth (<i>S</i><sub>11</sub> ≤ −10&#xa0;dB) spanning 3.2–7.2&#xa0;GHz (76.92%) and an axial ratio bandwidth (AR ≤ 3&#xa0;dB) ranging from 2.8 to 4.1&#xa0;GHz (1.3&#xa0;GHz). The antenna demonstrates inter-element isolation below −17&#xa0;dB, an envelope correlation coefficient (ECC) lower than 0.02, and a diversity gain (DG) exceeding 9.97&#xa0;dB across its ports. It exhibits minimal coupling and satisfactory diversity performance. Thus, this proposed antenna is a suitable candidate for facilitating dual circular polarization communication and polarization diversity systems in Sub-6&#xa0;GHz (n78 (3.3–3.8&#xa0;GHz), n77 (3.3–4.2&#xa0;GHz), n48 (3.5–3.7&#xa0;GHz), n79 (4.4–5.0&#xa0;GHz), n46 (5.1–5.9&#xa0;GHz), and n47 (5.8–5.9&#xa0;GHz) 5G bands), and WiFi-6E (n96 (5.925–7.125&#xa0;GHz)) applications.</p>

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Dual-CP MIMO Antenna with Polarization Diversity for Sub-6 GHz and WiFi-6E Applications

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Surendra Kumar Gupta,
  • Amit Bage,
  • Lakhindar Murmu,
  • Prakash Pareek

摘要

This article presents a design of a four-port MIMO antenna to support dual circular polarization (CP) for Sub-6 GHz and WiFi-6E bands while emphasizing polarization diversity. The MIMO antenna comprises four elements, two configured for left-hand circular polarization (LHCP) and the other two for right-hand circular polarization (RHCP). To achieve circular polarization in each antenna element, a stub-loaded microstrip feed line and a slotted ground plane featuring a rectangular slot and a triangular stub are utilized. The antenna design features a compact form factor with dimensions of (0.63 × 0.63 × 0.019) λ0. It exhibits an impedance bandwidth (S11 ≤ −10 dB) spanning 3.2–7.2 GHz (76.92%) and an axial ratio bandwidth (AR ≤ 3 dB) ranging from 2.8 to 4.1 GHz (1.3 GHz). The antenna demonstrates inter-element isolation below −17 dB, an envelope correlation coefficient (ECC) lower than 0.02, and a diversity gain (DG) exceeding 9.97 dB across its ports. It exhibits minimal coupling and satisfactory diversity performance. Thus, this proposed antenna is a suitable candidate for facilitating dual circular polarization communication and polarization diversity systems in Sub-6 GHz (n78 (3.3–3.8 GHz), n77 (3.3–4.2 GHz), n48 (3.5–3.7 GHz), n79 (4.4–5.0 GHz), n46 (5.1–5.9 GHz), and n47 (5.8–5.9 GHz) 5G bands), and WiFi-6E (n96 (5.925–7.125 GHz)) applications.