Dual‐band reconfigurable coding metasurfaces hybridized with vanadium dioxide for wavefront manipulation at terahertz frequencies

Abstract

In this article, we propose a frequency reconfigurable reflective coding metasurface hybridized with vanadium dioxide (VO 2 ) meta-atoms for wavefront manipulation at terahertz (THz) frequencies using the Pancharatnam-Berry (PB) phase principle. At room temperature, the meta-atoms can achieve a nearly constant 180 reflection phase difference illuminated by linearly x-and y-polarized waves while maintaining almost consistent reflection amplitude within 3.76 to 3.84 THz, corresponding to the conductivity of σ VO 2 = 2 × 10 2 S=m. Once the temperature is increased and VO 2 is in a fully metallic state with the conductivity of σ VO 2 = 2 × 10 5 S=m, the meta-atoms operate at 1.18 to 1.47 THz. Flexible controls of scattering patterns of the PB coding metasurface can be realized utilizing the meta-atoms. Numerical simulations demonstrate that the designed VO 2 -based metasurface can generate multibeams as expected. This work opens a pathway in designing frequency reconfigurable coding metasurface to generate multibeams in THz, which holds great potential in new concept antennas for future wireless communication systems. K E Y W O R D S coding metasurface, frequency reconfigurable, multibeams, vanadium dioxide

Terahertz Reconfigurable Intelligent Surfaces (RISs) for 6G Communication Links

“…The metasurface had a simulated wideband deflection of ~28 • at 0.8 THz (Figure 7c). Embedded VO 2 with resonant structures for a multifunctional coding metasurface was also presented numerically [91,[93][94][95]]. An experimental demonstration of VO 2 -based reconfigurable beam steering was presented in [89] (Figure 7d).…”

Dynamic RCS Reduction Performances of Antenna Array with Coding Metasurface

“…Recently, metasurfaces have attracted worldwide attention. Due to their extraordinary ability to control electromagnetic waves, some types of them have been utilized to reduce RCS of target, such as artificial magnetic conductor (AMC) [8], polarization conversion metasurface (PCM) [9], metamaterial absorber (MA) [10,11], and digital coding metasurface [12][13][14][15][16][17]. However, most of these applications of metasurfaces are not combined with the antennas, or they are designed separately.…”