Electromagnetic retroreflection augmented by spherical and conical metasurfaces

Shang, Yuping; Shen, Zhongxiang

doi:10.1063/1.5004252

Cited by 4 publications

(2 citation statements)

References 55 publications

(44 reference statements)

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“…For curved electromagnetic devices, it can mainly realize antenna radiation, [16] multi-beam scattering, [17] low backward scattering, [18][19][20] backscattering enhancement, and other functions. [21][22][23] In terms of antenna radiation, a conformal wearable transparent antenna has been designed through the integration of conductive mesh and polymer, which has good radiation and mechanical properties. [16] In 2018, Xu et al used the geometric phase design to generate strong twobeam scattering of the metal cylinder in the whole Ku band.…”

Section: Introductionmentioning

confidence: 99%

Optically Transparent Conformal Reflectarray with Multi‐Angle Microwave Efficient Scattering Enhancement

Fan,

Zhao,

Chen

et al. 2024

Advanced Optical Materials

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Optically transparent electromagnetic devices play a key role in modern society. Traditional transparent electromagnetic devices face the problems of high return loss, low optical transparency, and dependence on the properties of transparent conductive materials. Due to the limitation of substrate, there are few studies on conformal transparent reflectarray. However, for conformal targets such as aircraft, it is particularly important to fabricate conformal transparent reflectarray. Here, an optically transparent conformal reflectarray with multi‐angle scattering enhancement performance is proposed. ITO square ring and patch are selected to realize wide phase coverage and low return loss of the array is achieved by traversing the initial phase. By partitioning the phase distribution of the reflectarray, the 0° normal incidence efficient backscattering enhancement and the ±45° multi‐angle backscattering enhancement functions of the conformal reflectarray are realized in X‐band. Both simulation and experimental results verify the effectiveness of the proposed prototype. The reflectarray has high reflection efficiency, excellent optical transparency, stable performance, and is easy to manufacture. Therefore, it is expected to be applied to backscattering enhancement of transparent conformal shapes such as aircraft and friendly targets, and then improve the efficiency of target echo detection from multiple angles in complex situations.

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Section: Introductionmentioning

confidence: 99%

Optically Transparent Conformal Reflectarray with Multi‐Angle Microwave Efficient Scattering Enhancement

Fan,

Zhao,

Chen

et al. 2024

Advanced Optical Materials

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“…Retro-reflection, which means that the EM waves can be reflected to the direction of the incidence, can achieve enhancement of the backscattering of EM waves. The backscattering enhancement is quite important in many applications due to its performance in intensifying the echo signals [20], mainly including lifesaving, target tracking, and so on. Corner reflectors [21] and Luneburg lens [22] are mostly used to accomplish the retro-reflections.…”

Section: Introductionmentioning

confidence: 99%

Arbitrarily polarized retro-reflections by anisotropic digital coding metasurface

Shen¹,

Li²,

Li³

et al. 2019

J. Phys. D: Appl. Phys.

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We propose an anisotropic digital coding metasurface to realize arbitrarily polarized retro-reflections. With the theoretical support of generalized Snell’s laws, the proposed coding metasurface shows excellent performance of retro-reflections through reflection phase design. A modified metallic Jerusalem cross structure is employed to achieve the required phase profile under oblique incidence due to its good performance in polarization isolation. By changing the length of coding particle’s arms, the particle can be digitally named as ‘00’, ‘01’, ‘10’ and ‘11’ elements with different phase responses. Through special design of phase gradient, the coding metasurface can reflect incident waves backwards for arbitrary polarizations, which can be decomposed into transverse electric and transverse magnetic polarizations. A prototype was fabricated and measured. Both simulation and experiment results verify the good performance of the arbitrarily polarized retro-reflections by the metasurface.

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3D‐Printed Curved Metasurface with Multifunctional Wavefronts

Wang

et al. 2020

Advanced Optical Materials

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Achieving multifunctional wavefront controls on curved platforms, especially in the transmissive case, is of pivotal importance in the emerging technological field of communication and detection systems, yet it poses a great challenge. A strategy to control the versatile transmissive structured wavefront on conformal platform is proposed by curving a 3D printed flexible metasurface (MS), and its efficacy is demonstrated. The conformal metasurface (CMS) is designed to have broadband performance by cascading three super‐thin flexible printed circuit boards and two 3D‐printing substrates. A general theoretical strategy is proposed for the projection of a curved surface onto a referenced plane by judiciously engineering the compensation of the curvature‐induced phase. Next, four individual proof‐of‐concept conformal quarter‐cylindrical devices are experimentally characterized with the functionalities to generate highly directive beams, vortex‐beams carrying orbital angular momentums, and dual‐beam steering with different angular positioning, confirming the effectiveness and robustness of the proposed strategy. Most importantly, it is shown that the aforementioned multiple angle‐multiplexed functionalities can be achieved by a single synthesized full‐cylinder CMS. The findings demonstrate a successful approach to setting up a robust, systematic, multifunctional, and ultracompact MS for complete wavefront control over curved platforms.

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Electromagnetic retroreflection augmented by spherical and conical metasurfaces

Cited by 4 publications

References 55 publications

Optically Transparent Conformal Reflectarray with Multi‐Angle Microwave Efficient Scattering Enhancement

Optically Transparent Conformal Reflectarray with Multi‐Angle Microwave Efficient Scattering Enhancement

Arbitrarily polarized retro-reflections by anisotropic digital coding metasurface

3D‐Printed Curved Metasurface with Multifunctional Wavefronts

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