Design of Alvarez Beam Scanning Reflectarray With Inversely Proportional Focal Length

被引:10
作者
Al-Nuaimi, Mustafa K. Taher [1 ,2 ,3 ]
Zhu, Shi-Long [1 ]
Whittow, William G. [3 ]
Chen, Rui-Sen [1 ]
Huang, Guan-Long [1 ]
Mahmoud, Abdelhady [4 ]
机构
[1] Foshan Univ, Sch AI Guangdong & Taiwan, Foshan 528225, Peoples R China
[2] Southeast Univ, State Key Lab Millimeter waves, Nanjing 210096, Peoples R China
[3] Loughborough Univ, Wolfson Sch Mech Elect & Mfg Engn, Loughborough LE11 3TU, England
[4] Benha Univ, Benha Fac Engn, Banha 13512, Egypt
来源
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2023年 / 22卷 / 06期
基金
英国工程与自然科学研究理事会;
关键词
Alvarez phase; antenna array; beam scanning; metasurface; multibeam antenna; reflectarray (RA); ANTENNA; ELEMENTS;
D O I
10.1109/LAWP.2023.3243868
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 degrees 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 degrees phase range and to enhance the bandwidth of the RA. An Alvarez RA consisting of 38 x 38 PB meta-atoms has been designed, fabricated, and tested for +/- 45 degrees 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.
引用
收藏
页码:1416 / 1420
页数:5
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