A planar rectangular slot antenna with dual-band operation and realized higher peak gain is proposed, designed, and fabricated for sub-6 GHz 5G applications. The antenna possesses a rectangular radiating slot with the inverted stub on its upper edge excited simultaneously by a micro-strip feed line having a double folded T-shaped structure. The fabricated design is of compact size with the radiating portion of 0.3 λ0 × 0.17 λ0 (λ0 represents free-space wavelength) and profile of 0.009 λ0. The measured results show the operating frequency bands of 3.29–3.63 GHz and 4.3–5.2 GHz, with a peak gain of around 7.17 dBi. The higher frequency band is generated by the feed patch and the slot whereas lower resonant frequency band is generated by the stub loaded on the slot. The measured results are in a good agreement with the simulated results. The proposed design is suitable for the International Telecommunications Union sub 6 GHz applications.

中文翻译：

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适用于 6 GHz 以下 5G 无线应用的紧凑型双频平面印刷缝隙天线

为 sub-6 GHz 5G 应用提出、设计和制造了一种具有双频带操作和实现更高峰值增益的平面矩形缝隙天线。该天线具有矩形辐射槽，其上缘倒置短截线同时由具有双折叠T形结构的微带馈线激励。制造的设计尺寸紧凑，辐射部分为 0.3 λ0× 0.17 λ0(λ0代表自由空间波长）和 0.009 λ 的轮廓0. 实测结果显示工作频段为 3.29-3.63 GHz 和 4.3-5.2 GHz，峰值增益约为 7.17 dBi。较高的频带由馈电贴片和槽产生，而较低的谐振频带由加载在槽上的短截线产生。实测结果与模拟结果吻合较好。建议的设计适用于国际电信联盟低于 6 GHz 的应用。