Design of a Low-Profile Wideband Wide-scan Phased Array Antenna

2022 International Conference on Microwave and Millimeter Wave Technology (ICMMT) Pub Date : 2022-08-12 DOI:10.1109/ICMMT55580.2022.10022812

Hangyu Zhang, H. Tang, Li Wang, Wenxuan Jiang

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Abstract

A low-profile phased array antenna with wideband wide-scan characteristics has been presented. An aperture coupled feed mechanism and dual-layer radiating patches are adopted to achieve wideband impedance matching. Due to the piled dielectric slabs, the performance of microstrip antenna arrays is normally deteriorated by surface waves when scanning to large angles. To solve this issue, the stacked slabs have been perforated to the greatest extent to suppress surface wave propagation. Additionally, two pairs of parasitic strips have been designed to improve the antenna performance in the lower band without increasing the antenna profile. The thickness of the array is only $0.19\lambda_{h}(\lambda_{h}$ refers to the wavelength at the highest operating frequency in free space), indicating the good potential for low-profile applications. The proposed array antenna has achieved relative bandwidths of 57.9% (active VSWR $\leqslant 2.25$) and 44.4% (active VSWR $\leqslant 2.75$) for $\pm 45^{\circ}$ scanning and $\pm 60^{\circ}$ scanning, respectively.

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一种低轮廓宽带宽扫描相控阵天线的设计

提出了一种具有宽带宽扫描特性的低轮廓相控阵天线。采用孔径耦合馈电机构和双层辐射贴片实现宽带阻抗匹配。由于介质板的堆积，在大角度扫描时，表面波会使微带天线阵列的性能下降。为了解决这一问题，在叠层板上进行了最大程度的穿孔，以抑制表面波的传播。此外，设计了两对寄生带，在不增加天线外形的情况下提高了下频段的天线性能。阵列的厚度仅为$0.19\lambda_{h}(\lambda_{h}$(指在自由空间中最高工作频率处的波长)，这表明在低姿态应用方面具有良好的潜力。该阵列天线的相对带宽达到57.9% (active VSWR $\leqslant 2.25$) and 44.4% (active VSWR $\leqslant 2.75$) for $\pm 45^{\circ}$ scanning and $\pm 60^{\circ}$ scanning, respectively.

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2022 International Conference on Microwave and Millimeter Wave Technology (ICMMT)

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