Design of Diffusive Modified Chessboard Metasurface

Al-Nuaimi, Mustafa K. Taher; Wang, Hong; He, Yejun

doi:10.1109/lawp.2019.2925378

Cited by 53 publications

(22 citation statements)

References 27 publications

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“…It is well known that the conventional chessboard metasurface suffers from strong scattering in certain directions and degraded scattering characteristics under oblique incidence. The modified chessboard structure in [1] consists a four reflectarrays and using 1-bit quantized parabolic reflection phase. In other words, only two phase states (0 o and 180 o ) were used.…”

Section: Fabrication and Measurementsmentioning

confidence: 99%

“…In other words, only two phase states (0 o and 180 o ) were used. Also, in [1] the unit cells have been distributed periodically in rectangular grids. Compared to those chessboard metasurfaces in the literature, the proposed SFM#3 has a countless number of random PB phase states between 0 o and 360 o and an aperiodic distribution of PB meta-atoms across its aperture.…”

Section: Fabrication and Measurementsmentioning

confidence: 99%

“…anipulation of electromagnetic waves using metasurfaces has been a hot topic in recent years [1]- [8]. Electromagnetic wave (EM-wave) diffusion and radar cross section (RCS) reduction is one of the applications of metasurface [9]- [12].…”

Section: Introductionmentioning

confidence: 99%

“…However, such kind of surfaces suffers from strong scattering in certain directions and degraded scattering Manuscript characteristics under oblique incidence. In [1] a modified chessboard was proposed, and each quadrant of the conventional chessboard was replaced by a small size 1-bit reflectarray exhibiting an optimized diffusive 1-bit quantized phase distribution to achieve nearly uniform diffusive scattering under both normal and oblique incidence of EM-waves. In [10]- [11], the scattering characteristics of metasurfaces exhibiting concave and convex reflection phases were investigated for RCS reduction for linearly polarized waves.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a coding metasurface was introduced in [15]- [16] in which the coding particles (unit cells) were arranged according to a certain coding sequence to achieve low-level backscattering, and potentially any other desired functions [17]- [20]. In [1]- [20], metasurfaces were designed by placing meta-atoms and scatterers in rectangular periodic grids (framework). Important questions include whether this periodic arrangement is always the best option and whether it is possible to design metasurfaces with aperiodic distribution of meta-atoms to achieve elegant diffusion characteristics for circularly polarized (CP) waves.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Aperiodic Sunflower-Like Metasurface for Diffusive Scattering and RCS Reduction

Al-Nuaimi

Wang

Whittow

2020

Antennas Wirel. Propag. Lett.

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Abstract-This article presents the design of aperiodic sunflower-like metasurface for circularly polarized (CP) wave diffusion and radar cross section (RCS) reduction using Pancharatnam-Berry (PB) meta-atoms. The distribution of the PB meta-atoms across the metasurface aperture is non-uniform and has a distribution inspired by sunflower seeds, i.e., an outwardly logarithmic spiral lattice with no transitional periodicity. The proposed metasurface has 600 PB meta-atoms of sub-wavelength size of 5 mm ≈ 0.33λ 20GHz and exhibits a randomly chosen diffusive reflection phase between 0 o and 360 o . Both simulated and experimental results demonstrate that the proposed sunflower-like metasurface can efficiently diffuse the backscattered energy into numerous directions when normally illuminated by a CP-wave with RCS reduction > 7 dB between 16 GHz and 23.8 GHz. Furthermore, the low-level diffuse scattering can be preserved under oblique incidence up to 60 o . As a result of using this PB concept, the polarization sensitivity of the proposed metasurface is released and this is highly desired in applications when the polarization of the incoming wave is unknown.

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Section: Fabrication and Measurementsmentioning

confidence: 99%

Section: Fabrication and Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Aperiodic Sunflower-Like Metasurface for Diffusive Scattering and RCS Reduction

Al-Nuaimi

Wang

Whittow

2020

Antennas Wirel. Propag. Lett.

Self Cite

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A Highly Efficient Method for Designing Bisymmetric P‐B Phase Element Patterns of Coding Metasurfaces

Liu

Zhang

Wang

et al. 2023

Adv Materials Technologies

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The conventional trial-and-error method employed in the element pattern design of coding metasurfaces lacks theoretical guidance and requires considerable time and computational resources. To overcome this problem, this paper proposes a highly efficient design method for bisymmetric Pancharatnam-Berry (P-B) phase element patterns. First, the equivalent impedances of the element patterns are derived from the expected reflectance and frequency range using the transmission matrix method. Subsequently, the optimal geometric parameters of the element patterns are obtained using the equivalent circuit model. For the same element pattern, the time consumption is reduced by more than 25 times compared with that required for a single full-wave simulation. The simulation results show that metasurfaces adopting various design element patterns and the same coding sequence exhibit excellent backscattering energy homogenization performance, with a radar-cross-section reduction (RCSR) of less than −10 dB in the 9.47-17.57 GHz band. Two types of metasurfaces are fabricated using a meshed pattern, a sodium-calcium glass and a metallic mesh. The measured RCSR is less than −10 dB for a broadband of 7.74 GHz, and the normalized optical transmittance is 85% within 380-2500 nm, which is favorable for optical windows used in aerospace, medical, and precision instrumentation.

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Broadband linear‐cross and circular‐circular polarizers with minimal bandwidth reduction at higher oblique angles for RCS applications

Shukoor

Dey

Koul

et al. 2021

Int J RF Microw Comput Aided Eng

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In this work, broadband linear to cross and circular to circular polarization converter for K and Ka-band applications is proposed. The metasurface comprises a novel H-shaped unit cell printed on 1.2 mm thin FR-4 grounded dielectric substrate. It exhibits 90% polarization conversion ratio (PCR) over a bandwidth of 22.26 GHz (17.97-40.23 GHz) with 76.5% FBW maintaining a minimal PCR of 92.5%. The converter also maintains handedness for circularly polarized incident wave. Surface current distributions at different resonant frequencies are analyzed to illustrate the reason behind the broadband behavior.The converter design is simple with the cell periodicity of 0.209λ o and thickness of 0.071λ o , where λ o is the free-space wavelength corresponding to the lowest frequency of the band. Monostatic and Bistatic RCS analysis of the designed converter is performed, demonstrating greater than 10 dBsm RCS reduction over all the frequency range. It shows 16 to 30 dBsm at resonant

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Design of Diffusive Modified Chessboard Metasurface

Cited by 53 publications

References 27 publications

Aperiodic Sunflower-Like Metasurface for Diffusive Scattering and RCS Reduction

Aperiodic Sunflower-Like Metasurface for Diffusive Scattering and RCS Reduction

A Highly Efficient Method for Designing Bisymmetric P‐B Phase Element Patterns of Coding Metasurfaces

Broadband linear‐cross and circular‐circular polarizers with minimal bandwidth reduction at higher oblique angles for RCS applications

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