A quasi-Yagi antenna with parasitic cells and its array are proposed for 5G mm-wave bands. For the antenna unit, through introducing the parasitic cells, the gain could be enhanced maximum of 1.3 dB without increasing the antenna length and a wide bandwidth served for the 5G N258 band. Besides, substrate integrated waveguide (SIW) with short-circuit metal vias is employed as the feed structure and reflector, which can easily tune the impedance matching. For the antenna array, by designing a SIW power divider, the antenna element can be convenient to integrate as a 1 × 4 end-fire array. The antenna unit and its array have been fabricated and measured. The measured results show that the high peak gain of the element and array is 9.06 and 14.38 dB within the operation bands (24.25–27.5 GHz), respectively. It is suitable for miniaturized end-fire devices with 5G N258 mm-wave operation systems.

中文翻译：

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用于 5G 毫米波操作的带有寄生单元的准八木天线及其阵列

针对 5G 毫米波段提出了一种带有寄生单元的准八木天线及其阵列。对于天线单元，通过引入寄生单元，在不增加天线长度的情况下，增益最多可提高 1.3 dB，并为 5G N258 频段提供更宽的带宽。此外，采用带有短路金属过孔的衬底集成波导（SIW）作为馈电结构和反射器，可以轻松调整阻抗匹配。对于天线阵列，通过设计SIW功率分配器，可以方便地将天线单元集成为1×4端射阵列。天线单元及其阵列已经制作完成并进行了测量。测量结果表明，元件和阵列的高峰值增益在工作频段（24.25-27.5 GHz）内分别为 9.06 和 14.38 dB。