Multi-bit dielectric coding metasurface for EM wave manipulation and anomalous reflection

Saifullah, Yasir; Waqas, Abu Bakar; Yang, Guo‐Min; Xu, Feng

doi:10.1364/oe.383214

Cited by 35 publications

(10 citation statements)

References 41 publications

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“…where f e (θ, ψ) represents the far-field function of the subarray; θ and ψ are the pitch and azimuth angles of the scattered beam; ψ (m, n) is the reflected phase of a single array element; m, n are the array coordinate values; D = rp is the subarray period length of the metasurface; K represents the wave vector. Since the far-field scattering function on the metasurface is determined, such as the number of control beams, angle, and energy ratio, the required unit coding sequence could be theoretically calculated according to Equation (1). The frequency multiplexing units are implemented to perform different beam control functions at different operating frequencies, thus completing the design of the frequency multiplexing coding metasurface.…”

Section: The Design Of Metasurfacementioning

confidence: 99%

“…Electromagnetic metamaterials can flexibly control EM (electromagnetic) waves by modulating information such as the phase and amplitude in the propagation path [1]. Electromagnetic metasurfaces are two-dimensional spatial forms of electromagnetic metamaterials, also known as new artificial electromagnetic surfaces [2,3], with advantages such as thinner thickness, smaller size, and lower losses than traditional metasurface.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Design of Frequency Multiplexed Coding Metasurface for Dual-Functional Beam Control

Hao¹,

Ling²,

Ruan³

et al. 2022

PIER Letters

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A frequency multiplexed coding metasurface controlling beam is proposed to enrich the functions of a single metasurface. A square F4B dielectric substrate with a copper-clad bottom surface and a V-shaped and quadrangular cross-shaped metal structure is used as the unit. Applying the different responses of x and y polarized waves and optimization of structural parameters, we can obtain 1-bit coding units for the two frequency bands. The reflection phase can be modulated independently of each other. The design of a dual-band metasurface with different beam splitting effects was realized, achieving the goal of different frequency multiplexing functions on a single metasurface. An RCS reduction of 11 dB at 12 GHz and a double beam splitting at 20 GHz with a pitch angle of ±47.6 • are achieved by metasurface. The test results agree well with the simulation results. The proposed metasurfaces offer a simple structure, low cost, good performance, and promising great applications in areas such as frequency multiplexed communications.

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Section: The Design Of Metasurfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Frequency Multiplexed Coding Metasurface for Dual-Functional Beam Control

Hao¹,

Ling²,

Ruan³

et al. 2022

PIER Letters

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“…The antenna phase gradient metasurface, consisting of H-shaped elements, is proposed to reduce backscattering. To control electromagnetic (EM) wave and backscattering, a multi-bit dielectric reflective metasurface is demonstrated [28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Low Scattering Microstrip Antenna Based on Broadband Artificial Magnetic Conductor Structure

Saleem

2020

Materials

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In this summary, we have suggested a new technique in which destructive interference principle is incorporated into a chessboard like a reflective screen, and the proposed antenna realizes a remarkable in-band and also out-of-band backscattered energy reduction by using a metasurface (MS). Two different MS unit cells are designed to provide the resonant frequency with a zero-degree reflection phase. Metasurface unit cells are configured in a chessboard-like reflector screen to achieve the reflection phase difference of 180° ± 37° over a broadband range of frequencies to redirect the scattering field into four quadrants. It is implemented to reduce the backscattered energy level of the microstrip antenna, which is based on destructive interference principle. The simulations indicate that the proposed antenna possesses significant backscattered energy reduction from 6 GHz to 16 GHz in both x– and y– polarization and also −10 dB backscattering reduction at antenna working band (7.4–7.8 GHz) is covered. Moreover, the radiation performance is preserved well and artificial magnetic conductor (AMC) unit cells work at different frequencies which are not influenced on the radiation properties. The bistatic performance of the antenna at different frequencies is also presented. Measurements and simulations of the fabricated design coincide well and the proposed design is verified and validated successfully.

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“…Researchers do not need to consider the specific metallic structures constituting the ultimate coding metasurface, because the coding patterns determine the far-field and nearfield scattering fields, and the distribution of these metallic structures in the metasurface can be clarified. Following this concept of coding metasurfaces, different functions passive metasurfaces and methods have been proposed and presented, such as reducing radar cross-section [45][46][47][48][49][50], directional deflection of THz beams [17,[51][52][53][54], hologram imaging [55][56][57][58][59][60][61][62][63] and so on. However, in applications requiring THz wave variation, passive metasurfaces cannot perform the required functions, such as high-speed modulated metasurfaces for THz communication, wavefront reconstructed metasurfaces for THz imaging, beam scanning in THz radar and so on.…”

Section: Introductionmentioning

confidence: 99%

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

Zhang

Zeng

Kou

et al. 2020

Phil. Trans. R. Soc. A.

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The demand for smart and multi-functional applications in the terahertz (THz) frequency band, such as for communication, imaging, spectroscopy, sensing and THz integrated circuits, motivates the development of novel active, controllable and informational devices for manipulating and controlling THz waves. Metasurfaces are planar artificial structures composed of thousands of unit cells or metallic structures, whose size is either comparable to or smaller than the wavelength of the illuminated wave, which can efficiently interact with the THz wave and exhibit additional degrees of freedom to modulate the THz wave. In the past decades, active metasurfaces have been developed by combining diode arrays, two-dimensional active materials, two-dimensional electron gases, phase transition material films and other such elements, which can overcome the limitations of conventional bulk materials and structures for applications in compact THz multi-functional antennas, diffractive devices, high-speed data transmission and high-resolution imaging. In this paper, we provide a brief overview of the development of dynamic and active functional electromagnetic metasurfaces and their applications in the THz band in recent years. Different kinds of active metasurfaces are cited and introduced. We believe that, in the future, active metasurfaces will be combined with digitalization and coding to yield more intelligent metasurfaces, which can be used to realize smart THz wave beam scanning, automatic target recognition imaging, self-adaptive directional high-speed data transmission network, biological intelligent detection and other such applications. This article is part of the theme issue ‘Advanced electromagnetic non-destructive evaluation and smart monitoring’.

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Multi-bit dielectric coding metasurface for EM wave manipulation and anomalous reflection

Cited by 35 publications

References 41 publications

Design of Frequency Multiplexed Coding Metasurface for Dual-Functional Beam Control

Design of Frequency Multiplexed Coding Metasurface for Dual-Functional Beam Control

Low Scattering Microstrip Antenna Based on Broadband Artificial Magnetic Conductor Structure

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

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