4.6 Article

Design of Tunable Broadband Graphene-Based Metasurface with Amplitude-Phase Modulation

Journal

MATERIALS
Volume 16, Issue 13, Pages -

Publisher

MDPI
DOI: 10.3390/ma16134633

Keywords

graphene; metasurface; reflection amplitude phase; code

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Due to the scarcity of spectrum resources in the low-frequency band, there is an urgent need for beam-reconfigurable antennas in the millimeter wave band. This paper proposes a W-band graphene-based metasurface with reflective amplitude coding, which can modulate the reflective amplitude and phase through adjusting the Fermi levels of graphene. The metasurface achieves amplitude-phase modulation in a significantly wide bandwidth and allows for multi-beam switching and beam deflection in far-field.
Due to the growing scarcity of spectrum resources in the low-frequency band, the requirement of beam-reconfigurable antennas in the millimeter wave band is urgent. In this paper, a W-band graphene-based metasurface working in a broad bandwidth is proposed with reflective amplitude coding. Here, graphene sheets play a dual role in radiating and regulating electromagnetic waves. By adjusting the Fermi levels of graphene, the reflective amplitude and phase of the metasurface can be modulated simultaneously, enabling multi-beam switching and beam deflection in far-field. The proposed metasurface achieves amplitude-phase modulation within a significantly wide bandwidth which covers 75-91.5 GHz and 99.3-115 GHz. By optimizing the coding patterns, the proposed graphene-based metasurfaces are able to not only realize 2-D beam steering, but also achieve beam switching from single beam to four beams at 87 GHz. The proposed design provides a novel solution for the flexible manipulation of millimeter waves, which can be applied to various fields such as vehicle radar, satellite communication, 6G wireless communication, and beyond.

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