A tightly coupled bowtie array antenna at a millimetre-wave band is presented in the study. The antenna has a simple structure and exhibits a high performance over an ultra-wide bandwidth. The feeding network is designed by using the dielectric-based inverted microstrip gap waveguide technology in order to have a compact layout. An 8 × 8 planar array is designed and prototyped. The measured results show that the proposed array has achieved an overall bandwidth of 55.7% from 18.7 to 33.15 GHz. The maximum measured gain is 21.8 dBi at 32.5 GHz, and the total antenna efficiency is above 40% through the whole bandwidth.

中文翻译：

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具有基于电介质的倒置微带隙波导的馈电网络的超宽带线性极化平面领结阵列天线

这项研究提出了毫米波段的紧密耦合领结阵列天线。该天线结构简单，在超宽带宽上表现出高性能。通过使用基于电介质的倒置微带隙波导技术来设计馈电网络，以实现紧凑的布局。设计并制作了一个8×8平面阵列。测量结果表明，所提出的阵列在18.7 GHz至33.15 GHz范围内实现了55.7％的总带宽。在32.5 GHz时，最大测量增益为21.8 dBi，在整个带宽范围内，总天线效率高于40％。