Research on near-field focusing algorithm of reconfigurable reflect-array

• Published in: Journal of engineering (Stevenage, England) Vol. 2019; no. 19; pp. 5801 - 5804
• Main Authors: Liu, HongYan, Zheng, Pei, Wang, Chao, Guo, Lei, Zhang, XinYu
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.10.2019; Wiley
• Subjects: antenna radiation patterns; field programmable gate arrays; field-programmable gate array; focusing; IET International Radar Conference (IRC 2018); imaging distance; microwave antenna arrays; microwave imaging; near-field beam focusing algorithm; near-field focusing algorithm; near-field imaging application; reconfigurable reflectarray; reflectarray antennas; scanning antennas; security; security imaging; field programmable gate arrays; near-field imaging application; reconfigurable reflectarray; reflectarray antennas; focusing; field-programmable gate array; near-field beam focusing algorithm; security; microwave imaging; imaging distance; antenna radiation patterns; microwave antenna arrays; security imaging; scanning antennas; near-field focusing algorithm
• ISSN: 2051-3305; 2051-3305
• DOI: 10.1049/joe.2019.0294

In this study, the near-field beam focusing algorithm of reconfigurable reflect array for security imaging application is proposed. The proposed near-field focusing algorithm is based on classic array method, which is usually adopted for far-field pattern calculation. In order to satisfy the near-field imaging application, the imaging distance is added to array method, and the improved formula can calculate the shifting phase of every array element precisely. In addition, due to discrete phase characteristic of reconfigurable reflect array, a phase choice method based on trigonometric function is used in authors’ design. Based on the proposed algorithm, the shifting phase of every element is calculated and obtained the simulated beam focusing patterns. Meanwhile, the calculated shifting phase is written to whole array by field-programmable gate array, the near-field beam scanning patterns is measured and the measured results are in good agreement with the simulated ones.