Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 70, Issue 1, Pages 254-263Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2021.3119376
Keywords
Metasurfaces; Broadband communication; Bandwidth; Gratings; Orbits; Germanium; Microwave imaging; Broadband; Fabry-Perot cavity; metasurface; orbital angular momentum
Categories
Funding
- National Natural Science Foundation of China (NSFC) [62071187, 62071125, 11674111, 61575070, 11750110426]
- Natural Science Foundation of Fujian, China [2017J01003]
- Foreign Cooperation Projects in Fujian, China [2016I0008]
- Foreign Cooperation Projects of Quanzhou City Science and Technology Program of China [2017T006]
- Subsidized Projects for Postgraduates' Innovative Fund in Scientific Research of Huaqiao University [1611301025, 17013082018, 18013082025]
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The study demonstrates a high-efficiency broadband ultrathin metasurface incorporating metallic gratings and double-split-ring resonators. The metasurface has multiple functionalities, generating beams with different orders and vortex beams with various orbital angular momentum modes in both reflection and transmission spaces.
We demonstrate a broadband near-100%-efficiency ultrathin metasurface operating at microwave and millimeter-wave frequencies. We develop and employ two orthogonally polarized metallic gratings to form a Fabry-Perot cavity and incorporate a subwavelength metallic double-split-ring resonator at the center of each unit cell. It allows arbitrary amplitude-phase combinations with no coupling between amplitude and phase or between transmitted and reflected waves, leading to the design of an ultrathin but highly efficient broadband metasurface with multiple functionalities. Furthermore, the proposed metasurface can generate diffractive beams with different orders and vortex beams with different orbital angular momentum (OAM) modes in reflection and transmission spaces simultaneously. Both numerical and experimental results verify that the proposed metasurface has superior performance to its counterparts that are based solely on phase control. The proposed metasurface presents a lightweight, low-cost, and easily deployable flat device for microwave and millimeter-wave applications.
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