This letter proposes a new design of a dual-band dual-polarized base station antenna with a notch band for second-generation (2G), 3G, 4G, and the sub-6 GHz 5G systems. The antenna is composed of a four-leaf loop radiator, two-layer parasitic annular disk and a pair of crossed Y-shaped baluns. By introducing mouse-ear shaped arm to the edge of each radiator, a dual-band operating characteristic and a notch band from 2.9-3.2 GHz are realized. The annular disks and gradient strips are beneficial for bandwidth enhancement. The measured results show that the proposed antenna offers two broad bands with the fractional bandwidth of 55.8% (1.55-2.75 GHz), and 14% (3.3-3.8 GHz) for voltage standing -wave ratio (VSWR) <; 1.7 and isolation > 30 dB. This design achieves stable gain of 7.1 ± 0.5 dB and half power beam width of 68 ± 5° during the working bands. These attractive features make the antenna an ideal candidate for 2G, 3G, 4G, and the sub-6 GHz 5G base station applications.

中文翻译：

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适用于 2/3/4/5G 通信系统的带陷波带的双频双极化基站天线


这封信提出了一种用于第二代（2G）、3G、4G和6 GHz以下5G系统的带陷波带的双频双极化基站天线的新设计。该天线由四叶环形辐射器、两层寄生环形盘和一对交叉的Y形巴伦组成。通过在每个辐射器的边缘引入鼠耳形臂，实现了双频段工作特性和2.9-3.2 GHz的陷波频段。环形盘和梯度带有利于带宽的增强。测量结果表明，该天线提供两个宽带，其分数带宽为55.8%（1.55-2.75 GHz），电压驻波比（VSWR）<为14%（3.3-3.8 GHz）； 1.7 和隔离> 30 dB。该设计在工作频段内实现了 7.1 ± 0.5 dB 的稳定增益和 68 ± 5° 的半功率波束宽度。这些极具吸引力的功能使该天线成为 2G、3G、4G 和 6 GHz 以下 5G 基站应用的理想选择。