Single-Layer 1-Bit Prephased Single-Beam Metasurface Using True-Time Delayed Unit Cells

• Published in: IEEE antennas and wireless propagation letters Vol. 21; no. 6; pp. 1095 - 1099
• Main Authors: Wu, Qi, Long, Xiaohua, Yin, Jiexi, Yu, Chen, Wang, Haiming, Hong, Wei
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Delay lines; Delays; Frequency measurement; Metasurface; Metasurfaces; Periodic structures; Plane waves; prephase; Surface waves; Time lag; true-time delay; Wireless communication
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2022.3157903

A single-layer prephased 1-bit reflective metasurface is proposed to achieve single-beam radiation patterns under normally incident plane waves. By integrating the true-time delay lines with the prephase technique, the proposed design resolves the inherent symmetric beam issue of the conventional 1-bit reflective metasurface design in a single-layer design. To verify the proposed design, three 1-bit reflective metasurfaces comprising 20 × 20 unit cells with single beams pointing separately at <inline-formula><tex-math notation="LaTeX">-15^{\circ }</tex-math></inline-formula>, <inline-formula><tex-math notation="LaTeX">15^{\circ }</tex-math></inline-formula>, and <inline-formula><tex-math notation="LaTeX">30^{\circ }</tex-math></inline-formula> are designed and measured over frequencies of 35.0-43.0 GHz. Simulated and measured results show that the proposed prephased 1-bit reflective metasurface can achieve single-beam patterns under normally incident plane waves using only one layer.