In this letter, a microstrip patch hybrid mode technique is introduced to design a 2-D wide-angle scanning planar phased array. The proposed element consists of a circular patch and four rectangular parasitic patches distributed around the circular patch. In order to obtain wider radiation beamwidth (BW) in two orthogonal azimuth planes, the TM11 mode of the circular patch and the zeroth-order resonant mode of the parasitic rectangular patches are separately excited. Experimental results show that the proposed element can obtain 3 dB BW more than 156° in the two orthogonal azimuth planes. Moreover, an 8 × 8 planar phased array formed by this element can realize wide-angle scanning in a range of about ±65° in the two orthogonal azimuth planes. In the above scanning range, the sidelobe levels of the phased array are always less than −7.8 dB, the scanning gain fluctuation is less than ±1.73 dB, and the main polarizations on the two orthogonal planes are both θ-polarized. In addition, the phased array has a simple structure, a low profile, and convenient fabrication.

中文翻译：

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具有混合贴片模式技术的二维广角扫描相控阵

在这封信中，介绍了一种微带贴片混合模式技术来设计二维广角扫描平面相控阵。所提出的元件由一个圆形贴片和分布在圆形贴片周围的四个矩形寄生贴片组成。为了在两个正交方位平面上获得更宽的辐射波束宽度 (BW)，圆形贴片的 TM11 模式和寄生矩形贴片的零阶谐振模式被分别激发。实验结果表明，所提出的元件可以在两个正交方位平面上获得超过 156° 的 3 dB BW。而且，由该元件构成的8×8平面相控阵可以在两个正交的方位平面上实现±65°左右范围内的广角扫描。在上述扫描范围内，相控阵的旁瓣电平始终小于-7.8 dB，扫描增益波动小于±1.73 dB，两个正交平面上的主偏振均为θ偏振。此外，相控阵结构简单，外形低矮，制作方便。