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<p>A dual-polarized antenna element is presented for 5G New Radio (NR) base station applications covering the n77 (3.3–4.2&#xa0;GHz), n78 (3.3–3.8&#xa0;GHz), and n79 (4.4–5.0&#xa0;GHz) bands. The design integrates slot-loaded crossed dipoles, Y-shaped feeding structures, and three sets of coplanar peripheral parasitic elements to achieve wideband operation with high port isolation and spurious-mode suppression. Measurements show a 48.5% (3.28–5.38&#xa0;GHz) and 49.4% (3.28–5.43&#xa0;GHz) impedance bandwidth (VSWR ≤ 1.5), isolation better than 25 dB, and a peak gain of 8.03–9.01 dBi with ≥ 90% efficiency. Stable radiation patterns with a 65° ± 5° half-power beamwidth (HPBW) and cross-polarization discrimination (XPD) above 25 dB confirm its suitability for 5G base station deployment. The proposed structure offers a balanced trade-off between bandwidth, isolation, and design simplicity, making it a practical candidate for sub-6&#xa0;GHz massive MIMO systems.</p>

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A Wideband Dual-Polarized Antenna Element with High Isolation for 5G Base Station Applications

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • Rong Cao,
  • Chang-Zhi Liu

摘要

A dual-polarized antenna element is presented for 5G New Radio (NR) base station applications covering the n77 (3.3–4.2 GHz), n78 (3.3–3.8 GHz), and n79 (4.4–5.0 GHz) bands. The design integrates slot-loaded crossed dipoles, Y-shaped feeding structures, and three sets of coplanar peripheral parasitic elements to achieve wideband operation with high port isolation and spurious-mode suppression. Measurements show a 48.5% (3.28–5.38 GHz) and 49.4% (3.28–5.43 GHz) impedance bandwidth (VSWR ≤ 1.5), isolation better than 25 dB, and a peak gain of 8.03–9.01 dBi with ≥ 90% efficiency. Stable radiation patterns with a 65° ± 5° half-power beamwidth (HPBW) and cross-polarization discrimination (XPD) above 25 dB confirm its suitability for 5G base station deployment. The proposed structure offers a balanced trade-off between bandwidth, isolation, and design simplicity, making it a practical candidate for sub-6 GHz massive MIMO systems.