In this letter, a novel compact wideband antenna with broadside and conical diversity patterns is presented for fifth-generation (5G)-NR applications. The capacitive loading is implemented to enhance the port isolation and for size reduction (0.35 λ0 × 0.29 λ0 × 0.047 λ0). With an extra slot mode introduced by the coupled feeding scheme, a wide impedance bandwidth is obtained. A miniaturized broadband 180° hybrid coupler is designed to provide in-phase and out-of-phase excitations. It is composed of a quarter-wavelength parallel coupled-line and lumped LC components. As a result, conical and broadside diversity radiation patterns are achieved. The proposed antenna is analyzed, fabricated, and measured. Good agreement is achieved between the simulated and measured results. The measured overlapped −10 dB impedance bandwidth is 20.5% (3.16–3.81 GHz). The measured in-band isolation is better than 22.7 dB and the peak value achieves 34.7 dB. The proposed pattern diversity antenna exhibits good overall performance, including compact size, wide bandwidth, high isolation, and good radiation performance. Therefore, it is suitable for space-limited 5G-NR applications.

中文翻译：

---

适用于 5G-NR 应用的紧凑型宽带模式分集天线


在这封信中，我们提出了一种适用于第五代 (5G)-NR 应用的新型紧凑型宽带天线，具有宽边和锥形分集模式。实施电容负载是为了增强端口隔离并减小尺寸（0.35 λ0 × 0.29 λ0 × 0.047 λ0）。通过耦合馈电方案引入的额外槽模式，可以获得较宽的阻抗带宽。小型化宽带 180° 混合耦合器旨在提供同相和异相激励。它由四分之一波长平行耦合线和集总LC元件组成。结果，实现了圆锥形和侧边分集辐射方向图。对所提出的天线进行了分析、制造和测量。模拟结果和测量结果之间取得了良好的一致性。测得的重叠−10 dB 阻抗带宽为20.5% (3.16–3.81 GHz)。实测带内隔离度优于22.7 dB，峰值达到34.7 dB。所提出的方向图分集天线表现出良好的整体性能，包括尺寸紧凑、带宽宽、隔离度高和良好的辐射性能。因此，它适合空间有限的5G-NR应用。