Partition Layout Loading of Frequency Selective Surface Absorbers on the Curved Surfaces for the Significant RCS Reduction

Huang, Qiulin; Liu, Yutong; Cao, Qiyang; Zhao, Yong; Cao, Zhaowang; Guo, Sai; Miao, Ling; Jiang, Jianjun

doi:10.1109/tmtt.2022.3162305

Cited by 23 publications

(5 citation statements)

References 29 publications

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“…Electromagnetic structure absorbers can absorb incident electromagnetic energy at specific frequencies to reduce the radar cross-section, [1][2][3] so they are well used in stealth technology. Compared with conventional absorbing materials, absorbers are characterized by light weight and design freedom.…”

Section: Introductionmentioning

confidence: 99%

A tightly‐coupled planar absorber with broadband and wide‐angle

Chen,

Lin,

Yang

et al. 2024

Micro & Optical Tech Letters

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Most planar absorbers are designed under normal incidence, leading to a sharp decline in absorber performance under oblique incidence, especially when the incidence angle exceeds 30°. Three‐dimensional structured absorbers ensure the performance of the absorber under oblique incidence, but they lack practicality due to their complex processing and assembly. In this letter, a tightly‐coupled planar absorber (TCPA) is proposed. Its design method combines the reciprocity principle and tightly‐coupled structure, incorporating a wide‐angle matching layer and interdigitated structures to improve planar absorber's performance under oblique incidence. A sample is fabricated and measured for verification. The measurement results show that the absorber has a fractional bandwidth of 102.0% with an absorption rate of at least 90% under normal incidence. When the incident angle reaches 50°, the absorber maintains good performance under both transverse electric and transverse magnetic polarization.

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Section: Introductionmentioning

confidence: 99%

A tightly‐coupled planar absorber with broadband and wide‐angle

Chen,

Lin,

Yang

et al. 2024

Micro & Optical Tech Letters

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“…Thus, it is essential to achieve the RCS reduction of the curved surface structure in order to considerably reduce the aircraft's backward electromagnetic scattering and improve the target's combat survivability. The majority of the studies on RCS reduction of curved structures [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] that are currently available focus on convex structures [4][5][6][7][8][9][10][11][12][13][14][15], while concave structures [16][17][18] have received limited attention in previous studies. Ishii et al using a concave metasurface absorber, achieved a −10 dB RCS reduction at 9.88 GHz under normal incident [16].…”

Section: Introductionmentioning

confidence: 99%

Ultra-wideband and wide-angle RCS reduction of a concave structure based on a chessboard polarization conversion metasurfaces

He,

Chen,

Liu

et al. 2023

J. Phys. D: Appl. Phys.

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In this paper, ultra-wideband and wide-angle radar cross section (RCS) reduction of a concave structure is designed and realized based on a chessboard polarization conversion metasurface (CPCM), employing an ultra-wideband polarization conversion metasurface (PCM) composed of a single layer of square split-ring resonators. The concave structure, which is equivalent to an octagonal-like prism, is divided into eight regions. To achieve perfect phase cancellation in the non-central region, it can be equivalent to oblique incidence when the central region is under normal incidence, and phase compensation of the unit cell of metasurfaces in the non-central region is considered. The simulated results demonstrate that the RCS reduction of the proposed concave structure is less than -10 dB in the frequency ranges of 8.8 GHz to 35.75 GHz with fractional bandwidths of 120.99% and exceeds -30 dB at numerous resonant frequencies such as 9.52 GHz, 13.89 GHz, 23.45 GHz, and 35.2 GHz under normal incidence. The experimental results are in good agreement with the simulations. Furthermore, the RCS reduction characteristics of the proposed concave structure at different azimuth angles are also evaluated. Numerical calculations and experiments show that the wide-angle RCS reduction from 0° to 34° is achieved. To the best of the information we have, this is the first time that the chessboard metasurfaces, which consist of several polarizing reflectors, have been employed to obtain broadband and wide-angle RCS reduction for the concave structure. This technique validates the novelty and effectiveness of wide-angle and ultra-wideband RCS reduction of the concave structure.

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“…[12][13][14][15] Various forms of conformal metasurfaces have been proposed. [16][17][18] However, most of the current conformal reflective metasurfaces are passive structures. Once the structure is designed, its EM characteristics cannot be changed, lacking flexibility in manipulating EM waves.…”

Section: Introductionmentioning

confidence: 99%

Flexible Conformal Multifunctional Time‐Varying Phase‐Modulated Metasurface with Polarization Control for Radar Feature Transformation

Sun,

Xing,

Wang

et al. 2023

Advanced Optical Materials

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Reconfigurable metasurfaces have shown unprecedented capabilities in controlling electromagnetic (EM) waves in recent years and play an essential role in information manipulation. However, most research on reconfigurable metasurfaces is limited to planar rigid structures, with only one control function and suitable for specific single polarization. Achieving simultaneous control of phase, polarization, and frequency in the conformal structure has significant practical implications in many applications, but remains obviously challenging. In this paper, a flexible multifunctional time‐varying phase‐modulated metasurface (MTPM) with orthogonal polarization control is proposed for conformal applications to manipulate the spectrum distribution. It enables time encoding capability in controlling the phase characteristics of x‐ and y‐polarized EM waves individually by switching the bias voltage of the PIN diode in two directions. Discrete harmonic spectrum and continuous Doppler frequency shifts are implemented separately on two orthogonal polarizations by applying different time coding sequences. As a practical application, a conformal MTPM for radar feature transformation is explored. Multiple discrete false targets and defocusing phenomena can be realized respectively for x‐ and y‐polarized waves. Both simulated and measured results verify the validity of the proposed method and prototype.

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Partition Layout Loading of Frequency Selective Surface Absorbers on the Curved Surfaces for the Significant RCS Reduction

Cited by 23 publications

References 29 publications

A tightly‐coupled planar absorber with broadband and wide‐angle

A tightly‐coupled planar absorber with broadband and wide‐angle

Ultra-wideband and wide-angle RCS reduction of a concave structure based on a chessboard polarization conversion metasurfaces

Flexible Conformal Multifunctional Time‐Varying Phase‐Modulated Metasurface with Polarization Control for Radar Feature Transformation

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