单脉冲雷达
宽带
反射式阵列天线
雷达
Ka波段
定向天线
天线(收音机)
物理
光学
电信
计算机科学
缝隙天线
雷达成像
连续波雷达
作者
Z.X. Wang,Yun Hu,Lei Xiang,Jun Xu,Wei Hong
标识
DOI:10.1109/tap.2023.3312971
摘要
In this article, a wideband planar monopulse array antenna operating at Ka-band fed by the substrate integrated coaxial line (SICL) comparator network is proposed. The broadband SICL comparator is compactly deployed in the center of the feeding layer and integrated with the wideband stacked patch antennas on a multilayer printed circuit board (PCB), contributing to improved bandwidth, gain, and total efficiency. Moreover, the millimeter-wave (mmWave) front-end circuits can also be seamlessly integrated on the same board. Prototypes of $4\times4$ , $8\times8$ , $16\times16$ , and $32\times32$ monopulse array antennas are designed and fabricated. The measured results show a good agreement with the simulated ones. The $32\times32$ array antenna occupies a compact footprint of only $21.76\lambda _{0} \times 21.76\lambda _{0} \times 0.303\lambda _{0}$ while achieving an impedance bandwidth of 28.8% (28.8–38.5 GHz), a 3-dB gain bandwidth of 25% (29.25–37.6 GHz), and a peak gain of 28.6 dBi for the sum beam. The measured null depth is −56.49 dB, which indicates that excellent amplitude and phase balance is achieved by the proposed SICL comparator network. Finally, the gain variation with increasing array scales and the insertion losses of the comparator feeding networks are also investigated. The demonstrated performance merits of the proposed monopulse array antenna make it a competitive candidate for various Ka-band radar applications, such as low-cost seekers and autonomous driving.
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