Design of Alvarez Beam Scanning Reflectarray With Inversely Proportional Focal Length
Design of Alvarez Beam Scanning Reflectarray With Inversely Proportional Focal Length
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DOI：
10.1109/lawp.2023.3243868
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发表时间：
2023-06
影响因子：
4.2
通讯作者：
M. Al-Nuaimi;Shiran Zhu;W. Whittow;Rui-Sen Chen;Guanhua Huang;Abdelhady Mahmoud
中科院分区：
文献类型：
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作者：
M. Al-Nuaimi;Shiran Zhu;W. Whittow;Rui-Sen Chen;Guanhua Huang;Abdelhady Mahmoud
在这封信中，光束扫描Alvarez反射阵列（RA）超颖表面，其焦距（F）与Alvarez RA孔径上的相位分布成反比，光束扫描覆盖范围为±45°，增益损失小于3 dB。光束扫描机制基于将Alvarez RA面板机械倾斜到所需方向以操纵光束。与传统的RA相比，其中F与抛物线相位分布成正比，所提出的阿尔瓦雷斯RA显示出更宽的1和3 dB增益带宽，更高的孔径效率（AE），以及更宽的扫描范围，增益损耗小于3 dB。建议的RA采用了阿尔瓦雷斯相位分布，这是一个总和的两个移位立方相位分布。亚波长周期性的Pancharatnam-Berry（PB）亚原子被用来提供360°的相位范围并提高RA的带宽。由38 × 38 PB元原子组成的Alvarez RA已被设计、制造和测试为±45°束扫描覆盖，增益损失小于3 dB。模拟和测量结果表明，所提出的阿尔瓦雷斯RA超颖表面的增益为29.1 dBi在19.5 GHz，这对应于44.2%的AE。Alvarez RA的3 dB增益变化范围为15至23.4 GHz，对应的3 dB增益带宽为43.7%。在17.3 ~ 22.9 GHz范围内，1 dB增益带宽为27.8%。
In this letter, a beam scanning Alvarez reflectarray (RA) metasurface with its focal length (F) inversely proportional to the phase distribution on the Alvarez RA aperture is presented for ±45° beam scanning coverage and less than 3 dB gain loss. The beam scanning mechanism is based on mechanically tilting the Alvarez RA panel to the desired direction to steer the beam. Compared to a conventional RA where F is directly proportional to the parabolic phase distribution, the proposed Alvarez RA shows a wider 1 and 3 dB gain bandwidth, higher aperture efficiency (AE), and wider scanning range with less than 3 dB gain loss. The proposed RA has adopted an Alvarez phase distribution, which is a summation of two shifted cubic phase profiles. Pancharatnam– Berry (PB) meta-atoms of subwavelength periodicity were utilized to provide the 360° phase range and to enhance the bandwidth of the RA. An Alvarez RA consisting of 38 × 38 PB meta-atoms has been designed, fabricated, and tested for ±45° beam scan coverage with less than 3 dB gain loss. The simulated and measured results show that the gain of the proposed Alvarez RA metasurface is 29.1 dBi at 19.5 GHz, which corresponds to an AE of 44.2%. The 3 dB gain variation of the Alvarez RA is from 15 to 23.4 GHz, which corresponds to a 3 dB gain bandwidth of 43.7%. The 1 dB gain bandwidth was 27.8% from 17.3 to 22.9 GHz.