Single-Layer Dual-Band Microwave Metasurface Cloak of Conducting Cylinder

Tay, Chai Yan; Chen, Zhi Ning; Hee, David

doi:10.1109/tap.2019.2906504

Cited by 32 publications

(8 citation statements)

References 29 publications

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“…A general metasurface cloak (the blue cloak covering the cat in the right panel of Figure 1a) can reconstruct the scattering by the object (make it indiscernible) based on the careful design of the resonant particles at one specific frequency. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] However, due to the inherent material dispersion limitation, imperfect scattering will be captured (the object will be detected) when the general metasurface cloak is illuminated under a timedomain signal pulse comprising wideband frequency spectra.…”

Section: Working Principle For the Wideband Meta-cloakmentioning

confidence: 99%

“…Moreover, substantial scattering differences for different working frequencies are observed due to the material dispersion effects. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In stark contrast, by covering the bare object with the proposed superdispersive meta-cloak, the scattering wavefront and phase are completely rebuilt as if the incident THz beams are incident on flat ground for both TM (Figure 3e) and TE waves (Figure 3f) within a wide frequency window. Moreover, the meta-cloak can also effectively reconstruct the reflective wavefronts under oblique incidence within ±20° (see Figure S6, Supporting Information).…”

Section: Thz Wideband Meta-cloak Designmentioning

confidence: 99%

“…With the phase reconstruction, an invisibility metasurface cloak with preserved amplitude and phase can be achieved. [22][23][24][25][26][27][28] However, phase-preserved invisibility cloaks are naturally limited by the narrow working band, because the introduced subwavelength resonator microparticles are always associated with dispersion, which is in stark contrast to the dispersionless requirement of ideal broadband invisibility cloaks. [2] As a result, a broadband detector (e.g., imaging device) can obviously "see" the hidden object because the detector uses an incident pulse signal (comprising broadband frequency components) rather than the monochromatic wave.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Realization of a Superdispersion‐Enabled Ultrabroadband Terahertz Cloak

et al. 2022

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Invisibility has been a topic of long‐standing interest owing to the advent of metamaterials and transformation optics, but still faces open challenges after its tremendous development in recent decades. One of the big challenges is the narrow bandwidth, as the realization of an invisibility cloak is usually based on a metamaterial—an artificial composite material composed of subwavelength resonator structures that are always associated with dispersion. Different from previous works that have tried to eliminate the material dispersion to enhance the bandwidth of an invisibility cloak, here, it is found that by judiciously harnessing the material dispersion, the bandwidth of the cloak can still be significantly increased. Interestingly, the material dispersion does not violate the law of causality. As a proof of concept, an ultrabroadband terahertz (THz) carpet cloak is experimentally demonstrated through an array of superdispersive microparticles, rendering the target object invisible to detection by both time‐ and frequency‐domain wideband systems. The work presents a feasible invisibility strategy that is closer to practical applications and may pave a brand‐new way for the development of dispersion‐dominated ultrabroadband metadevices.

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Section: Working Principle For the Wideband Meta-cloakmentioning

confidence: 99%

Section: Thz Wideband Meta-cloak Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Realization of a Superdispersion‐Enabled Ultrabroadband Terahertz Cloak

et al. 2022

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“…The metamaterial cloaks can help achieve electromagnetic invisible. [13][14][15][16] In recent years, they have also been used to suppress the cross-band scattering existing in two neighboring antennas with no matter large frequency ratio [17][18][19][20] or small frequency ratio. 21 However, the decoupling bandwidth of meta-material cloak needs to be widened.…”

Section: Introductionmentioning

confidence: 99%

Split‐slot resonator loaded dual‐polarized electromagnetic transparent antenna for cross‐band scattering suppression

Chang

Chu

Jiang

2022

Int J RF Mic Comp-Aid Eng

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In this article, the realization method and operation mechanism of suppressing cross‐band scattering is introduced, firstly. And then, a SSRs‐loaded electromagnetic transparent antenna (ETA) is designed to suppress the scattering interference existing in the proposed dual‐band shared‐aperture antenna (P‐DBSA). The P‐DBSA is composed of the proposed ETA operating in the lower‐band (LB: 1.7–2.2 GHz) and a 2 × 2 array antenna operating in the higher‐band (HB: 3.4–3.6 GHz). The proposed ETA is obtained by etching folded split‐slot resonators (F‐SSRs) on the entire radiating arms of the LB antenna. In this way, the scattered field formed by the HB‐induced current distributed on the LB radiating arms can be self‐canceled, thereby HB radiation pattern restoration can be achieved. In addition, etching F‐SSRs will not cause the ETA to be difficult to match. The proposed decoupling method has the advantages of simple in structure, high integration, and easy to manufacture, and has important reference value for suppressing cross‐band scattering existing in DBSAs.

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“…In the past, analytical solutions to the scattering of conducting cylinders with or without surrounding dielectric materials [1,2] were derived. While various approaches including impedance loading [3], plasma coating [4], cloaking [5,6], and hard surfaces [7] were extensively studied with the purpose of reducing the scattering from conducting cylinders, relatively limited measures, such as random rough surfaces [8], complementary media [9], and phase gradient metasurface [10,11], were emphasized for the sake of enhancing the scattering. Besides, the reported scattering enhancement of cylinders mainly concentrates on passive and static techniques, which indicates that the angular range of the enhancement effect is probably narrow and their application thus suffers from certain restrictions.…”

Section: Introductionmentioning

confidence: 99%

Dynamic augmentation of scattering cross‐section by a conducting polycylinder coated with varactor‐loaded metasurface

Shang

Wang

Liao

et al. 2021

IET Microwaves Antenna & Prop

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Through reconfigurable scattering pattern assisted by a varactor-loaded polycylindrical metasurface, augmentation of backscattering as well as bistatic scattering cross-section of a conducting polycylinder is presented in this study. The tunable reflection phase gradient and the resultant redirection of the dominant scattering that are enabled by the directcurrent-biased varactors serve as the basis of the agile scattering pattern reconfiguration of the polycylindrical metasurface. To achieve compactness and facilitate biasing, the metasurface unit cell comprises an outer conducting grid frame and an inner rectangular conducting patch grounded with a via hole, while a surface-mounted varactor is soldered across the gap between them. It is demonstrated that the polycylinder coated with the designed reconfigurable metasurface can generate scattering behaviour very similar to a conducting plate with specific dimensions and orientation towards the plane's electromagnetic wave incidence. As a result, augmentation relative to the polycylinder without coating is observed for both backscattering and bistatic scattering cross-section. The agreement between simulated and measured scattering cross-section results validates the observations.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Single-Layer Dual-Band Microwave Metasurface Cloak of Conducting Cylinder

Cited by 32 publications

References 29 publications

Experimental Realization of a Superdispersion‐Enabled Ultrabroadband Terahertz Cloak

Experimental Realization of a Superdispersion‐Enabled Ultrabroadband Terahertz Cloak

Split‐slot resonator loaded dual‐polarized electromagnetic transparent antenna for cross‐band scattering suppression

Dynamic augmentation of scattering cross‐section by a conducting polycylinder coated with varactor‐loaded metasurface

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