Wideband RCS Reduction Using Coding Diffusion Metasurface

Ali, Liakat; Li, Qinlong; Khan, Tayyab; Yi, Jianjia; Chen, Xiaoming

doi:10.3390/ma12172708

Cited by 36 publications

(20 citation statements)

References 30 publications

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“…Then, based on the above results, the phase difference of 180 • ± 37 • can be realized and shown in Figure 3b. Compared with previously reported results [12][13][14][15][16][17][22][23][24], the non-planar circle ring structure can obtain a larger bandwidth, which is beneficial to the preparation of broadband metasurfaces. It is worth mentioning that the physical mechanism of a non-planar structure is introducing a variable parameter of height, compared with a planar structure, so that basic meta-particles with variable phase differences are greatly added and increase the ability to manipulating the EM waves.…”

Section: Unit Cell Designmentioning

confidence: 62%

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Ultra-Wideband RCS Reduction Based on Non-Planar Coding Diffusive Metasurface

Lin

et al. 2020

Materials

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A novel non-planar coding metasurface optimized by discrete particle swarm algorithm (DPSO) is proposed in terms of the property of wideband radar cross-section (RCS) and diffuse scattering. The design consists of two unit cells, “0” and “1”, which have a 180° ± 37° phase difference for phase interference cancellation. The 10 dB monostatic RCS reduction frequency range of the metasurface is from 6.4 to 29.6 GHz, and its bandwidth ratio is 4.62:1, under normal incidence of the two polarizations. Compared to the planar surface, the non-planar surface has a greater bandwidth with respect to the monostatic and bistatic RCS reduction. The results declare its properties of ultra-wideband, angle insensitivity, and polarization insensitivity. Finally, the theoretical analysis, simulation, and experimental results match perfectly, indicating that the metasurface can be used in the RCS reduction or other microwave applications with wider RCS reduction and diffuse scattering.

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Section: Unit Cell Designmentioning

confidence: 62%

“…In recent years, coding metasurface has been used to obtain broadband RCS reduction, which performs more accurately than checkerboard structures in controlling EM waves [16,17]. It can be traced back to Sievenpiper, who applies frequency-selective surfaces for phase control [18].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Wideband RCS Reduction Based on Non-Planar Coding Diffusive Metasurface

Lin

et al. 2020

Materials

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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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“…Metasurfaces are typically defined as a designed structures with lattice constants and thicknesses bellow the Bragg limit. Various kinds of MSs have been reported to improve the performances of antennas [1,2,3,4,5,6,7,8]. For example, due to the 0° reflection phase of an artificial magnetic surface (AMC), the antenna can have a higher boresight gain with a lower profile by using AMC as ground plane below the radiating element, compared with perfect electrical conductor ground [1].…”

Section: Introductionmentioning

confidence: 99%

“…In reference [7], the MS is used to change the linearly polarized EM waves from an antenna into circularly polarized EM waves. In reference [8], a radar cross-section (RCS) reduction technique by using the coding diffusion MS is presented, and the MS is optimized through a random optimization algorithm.…”

Section: Introductionmentioning

confidence: 99%

An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain

Chen

2019

Materials

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An optically transparent metasurface (MS) is proposed to design a resonant cavity fed by a patch antenna operating at 5.6 GHz. In the proposed MS, a transparent micro metal mesh conductive (MMMC) film is used as the transparent conducting film (TCF), and it has a high optical transmittance of more than 75% and a low sheet resistance of 0.7 Ω/sq. The MS is composed of a layer of glass substrate and a layer of MMMC film. The unit cell of MS consists of a square patch using MMMC film patterned on a square glass substrate. The transparent MS, patch antenna, ground plane, and air-filled half-wavelength cavity form a resonant cavity antenna, to achieve an improved gain. The MS is designed, optimized and analyzed using the EM simulation software CST. Results show that the MS can improve the simulated boresight gain from 4.7 to 13.2 dBi by 8.5 dB, without affecting the impedance bandwidth (IMBW) much. The losses of MS with different values of sheet resistance are also studied, showing the MS using MMMC with sheet resistance of 0.7 Ω/sq has very small losses.

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Wideband RCS Reduction Using Coding Diffusion Metasurface

Cited by 36 publications

References 30 publications

Ultra-Wideband RCS Reduction Based on Non-Planar Coding Diffusive Metasurface

Ultra-Wideband RCS Reduction Based on Non-Planar Coding Diffusive Metasurface

Terahertz smart dynamic and active functional electromagnetic metasurfaces and their applications

An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain

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