Abstract
In this paper, a multifunctional coding metasurface (MCMS) has been proposed to realize dual-circularly polarized beams and beam focusing with transmission and reflection. The phase of transmissive wave is controlled by rotating the elements, and the corresponding element, which consists of two quadrate voids etched on a single layer substrate, is designed for the metasurface with Pancharatnam-Berry (PB) phase. The phase distribution of the circularly polarized four-beam is determined according to the convolution theorem of patterns and the phase compensation principle. In order to validate the proposed metasurface, the multifunctional meta-device is fabricated and measured to illustrate the four-beam with left circular polarization in transmissive space and the right circularly polarized four-beam in reflective space by MCMS with x-polarized incidence. The experimental results heavily agree with the simulated data. The MCMS has potential applications in wireless communications due to its low profile, compact, and lightweight features.
Highlights
Circular polarization has been extensively applied in wireless satellite communications, optical displays, optical remote sensors, synthetic aperture radar imaging systems, contrast enhanced polarization micro-imaging, and biomolecular detection because of the incredible characteristics of chiral wave vector, uniform polarization distribution, lower glare effect, strong anti-interference ability, and low sensitivity between the receiver and transmitter (Lin et al, 2013; Cheng et al, 2021a; Li et al, 2021a; Li et al, 2021b; Fan et al, 2021; Han et al, 2021)
Different from the existing metasurfaces (Li et al, 2015; Zhang et al, 2016; Han et al, 2018; Ding et al, 2019; Chen et al, 2020; Li et al, 2021c; Tang et al, 2021; Zhao et al, 2021; Cheng et al, 2022), this paper proposed a multifunctional coding metasurface based on the convolution theorem of patterns and the phase compensation principle
multifunctional coding metasurface (MCMS) is simulated by the CST STUDIO 2020 with the infinite periodic boundary and the Flouquet ports and its numerical method is Finite Integration Theory (FIT)
Summary
Circular polarization has been extensively applied in wireless satellite communications, optical displays, optical remote sensors, synthetic aperture radar imaging systems, contrast enhanced polarization micro-imaging, and biomolecular detection because of the incredible characteristics of chiral wave vector, uniform polarization distribution, lower glare effect, strong anti-interference ability, and low sensitivity between the receiver and transmitter (Lin et al, 2013; Cheng et al, 2021a; Li et al, 2021a; Li et al, 2021b; Fan et al, 2021; Han et al, 2021). The two layers’ transmission metasurface was proposed to transform the x-polarized wave into RCP in the frequency range of 9.05–9.65 GHz and LCP in the range of 12.55–13.1 GHz (Liu et al, 2020). These metasurfaces realized the dual-circularly polarized EM waves in frequency domain. The coding metasurface consists of 1024 elements, which can convert the x-polarized incident waves into four transmissive beams with LCP and four reflective beams with RCP, and an opposite role for the y-polarized wave. The elements “0” and “1” are the unit cell with the rotation angle of 0 and 90deg
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