Absorbing properties of metamaterial dihedral corner reflector

Lu, Taoming; Wang, Youcheng; Yang, Helin; Huang, Xiaojun; Zhou, Yanfei; Wu, Jiong

doi:10.1088/2053-1591/ab7567

Cited by 6 publications

(3 citation statements)

References 28 publications

(34 reference statements)

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“…However, due to the different incident angles of multi-SAR satellites, when the corner reflector adapts to the incident angle of one satellite, its axis would deviate from the incident angle of other satellites. This paper proposes a model for estimating the RCS reduction caused by the deviation between the incident angle and the CR's axis, without considering the influence of the panel's dielectric constant [25,26].…”

Section: The Standard Rcs Model Of Dihedral Crmentioning

confidence: 99%

“…Anderson et al's study indicates that a 5 • vertical angle discrepancy between two panels results in approximately 6 dB RCS reduction [24]. Timothy et al [25] and Lu et al [26] analyzed the impact of a dielectric constant and the coating of absorptive materials to the RCS of dihedral CRs. The result indicates that a normalized surface impedance coefficient of 0.2 leads to an approximate 5 dBsm loss in scattered energy.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Dihedral Corner Reflector’s RCS Features in Multi-Resource SAR

Liu,

Li,

et al. 2024

Applied Sciences

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Artificial corner reflectors are widely used in the vegetated landslide for time series InSAR monitoring due to their permanent scattering features. This paper investigated the RCS features of a novel dihedral CR under multi-resource SAR datasets. An RCS reduction model for the novel dihedral corner reflector has been proposed to evaluate the energy loss caused by the deviation between the SAR incident angle and the CR’s axis. On the Huangtupo slope, Badong county, Hubei province, tens of dihedral CRs had been installed and the TSX–spotlight and Sentinel-TOPS data had been collected. Based on the observation results of CRs with more than ten deviation angles, the proposed reduction model was tested with preferable consistency under a real dataset, while 2 dBsm of systematic bias was verified in those datasets. The maximum incident angle deviation in the Sentinel data overlapping area is over 12°, which leads to a 2.4 dBsm RCS decrease for horizontally placed dihedral CRs estimated by the proposed model, which has also been testified by the observed results. The testing results from the Sentinel data show that in high, vegetation-covered mountain areas like the Huangtupo slope, the dihedral CRs with a 0.4 m slide length can be achieve 1 mm precision accuracy, while a side length of 0.2 m can achieve the same accuracy under TSX–spotlight data.

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Section: The Standard Rcs Model Of Dihedral Crmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of the Dihedral Corner Reflector’s RCS Features in Multi-Resource SAR

Liu,

Li,

et al. 2024

Applied Sciences

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“…The dihedral CR is one of reflectors with strong multiple scattering ability (Lu et al, 2020). In this paper, a dihedral CR embedded with acoustic metasurface is designed based on the generalized Snell law, and the metasurface itself is grooves array whose depth varies in gradient.…”

Section: Introductionmentioning

confidence: 99%

Modulation Mechanism of Acoustic Scattering in Underwater Corner Reflectors with Acoustic Metasurfaces

2023

Archives of Acoustics

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Using the tunderwater corner reflector (CR) to simulate the acoustic scattering characteristics of the military target is a new technology to counter active sonar detection. Existing underwater CRs only have the ability to interfere with the acoustic field, but have limitations in acoustic wave modulation. Therefore, acoustic metasurfaces applied on CRs to enhance the ability of acoustic wave modulation has a great application prospect. A fast prediction method based on the Kirchhoff approximation (KA) and the ray tracing theory is proposed to calculate the acoustic scattering characteristics of CR with acoustic metasurfaces in grooves array type. The accuracy of the method is verified by the finite element method (FEM) simulation. The modulation effect of CR with grooves array in different gradient combinations on the structural scattering acoustic field is analyzed. The research shows that the CR with different combinations of the acoustic metasurface has an obvious modulation effect on the amplitude of the acoustic waves and the deflection of acoustic field. In particular, the grooves array in combination with positive and negative gradients has an obvious deflection impact on the scattering acoustic field.

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