A Low-Profile Circularly Polarized Antenna Array With Considerable Overlapped Impedance and Axial-Ratio Bandwidths for 5G N78 Band

IF 1.2 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Microwave and Optical Technology Letters Pub Date : 2025-08-26 DOI:10.1002/mop.70377

Tian Liu, Zhicong Chen, Zepeng Cao, Longxiang Jiang, Gaosheng Li, Hao Li

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引用次数: 0

Abstract

A compact, low-profile circularly polarized (CP) antenna element is proposed using a two-layer printed circuit board (PCB) configuration. The radiator on the top of the first PCB is a rectangular loop inside with four sector-shaped patches, excited by a cross-slot of the ground on the top of the second PCB. The cross-slot is fed with a Γ-shaped microstrip line on the bottom of the second PCB. Based on this designed method, two CP modes are formed. The measured results show that it has a −10 dB impedance bandwidth (IBW) of 3.23–3.84 GHz (17.26%) and a 3 dB axial-ratio bandwidth (ARBW) of 3.33–3.71 GHz (10.80%), a realized gain of 7.70 ± 0.10 dBi and an average radiation efficiency of 72.56% over ARBW. Furthermore, a 2 × 2 antenna array is constructed using the proposed element and a four-way toroidal power divider network. The array is fabricated and measured with a −15 dB IBW of 3.20–3.94 GHz (20.73%), an ARBW of 3.16–3.96 GHz (22.47%), and a realized gain of 12.05 ± 0.19 dBi over 3.3–3.8 GHz band. Therefore, the left-handed CP array demonstrates that it can be a promising candidate for the 5G n78 systems.

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一种面向5G N78频段的低轮廓圆极化天线阵列，具有相当大的重叠阻抗和轴比带宽

提出了一种采用两层印刷电路板（PCB）结构的紧凑、低轮廓圆极化（CP）天线元件。第一块PCB板顶部的散热器是一个矩形环路，里面有四个扇形贴片，由第二块PCB板顶部的地面交叉槽激发。交叉槽由第二PCB底部的Γ-shaped微带线馈送。基于这种设计方法，形成了两种CP模式。测量结果表明，该天线−10 dB阻抗带宽（IBW）为3.23 ~ 3.84 GHz (17.26%)， 3 dB轴比带宽（ARBW）为3.33 ~ 3.71 GHz(10.80%)，实现增益为7.70±0.10 dBi，平均辐射效率为72.56%。此外，利用所提出的元件和四路环形功率分配器网络构建了一个2 × 2天线阵列。该阵列的IBW为3.20 ~ 3.94 GHz (20.73%)， ARBW为3.16 ~ 3.96 GHz(22.47%)，实现增益为12.05±0.19 dBi （3.3 ~ 3.8 GHz）。因此，左手CP阵列表明它可以成为5G n78系统的有希望的候选者。

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来源期刊

Microwave and Optical Technology Letters 工程技术-工程：电子与电气

CiteScore

3.40

自引率

20.00%

发文量

371

审稿时长

4.3 months

期刊介绍： Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas. - RF, Microwave, and Millimeter Waves - Antennas and Propagation - Submillimeter-Wave and Infrared Technology - Optical Engineering All papers are subject to peer review before publication