Metasurface with two-dimensional gradient-index phase distribution constructed by rotation ellipse elements for backward RCS reduction

• Published in: Electromagnetics Vol. 44; no. 7; pp. 508 - 520
• Main Authors: Su, Boli, Guan, Ke, He, Danping, Zheng, Wei, Qian, An, Zhong, Zhangdui, Hrovat, Anderj
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis 02-10-2024; Taylor & Francis Ltd
• Subjects: Gradient-index metasurface; Incident waves; Metasurfaces; multi-beams; normally incident waves; Phase distribution; Plane waves; radar cross-section reduction; Wave propagation
• ISSN: 0272-6343; 1532-527X
• DOI: 10.1080/02726343.2024.2408379

In this letter, the realization of minimizing the scattering of the Ku band is investigated by designing a two-dimensional gradient-index metasurface to control the propagation of the incident waves. Through the gradient phase design, the maximum RCS reduction was observed at 14 GHz, the x-polarized plane wave exhibits an RCS reduction of 15.43 dB, while the y-polarized plane wave shows an RCS reduction of 13.13 dB compared to the same size of PEC. The proposed metasurface with low backward RCS shows the capability to scatter the incident plane wave in different directions at both normal and oblique incidence. According to equation 2, by calculating the variable phase distribution of large-scale arrays at different frequencies, the maximum reduction of RCS can be obtained at any frequencies. Therefore, this work effectively designs and suggests the research of low RCS metasurface at different frequencies.