Radar cross‐section reduction studies of partially open cavity structures

Chou, Ri-Chee; Lee, Shung-Wu

doi:10.1002/jnm.1660010405

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…U nder the illumination of radar wave, when strong scattering sources (such as specular surface [1,2], cavity [3,4], and dihedral corner [5,6]) on detected targets are effectively controlled, and more attention should be paid to electromagnetic scattering from surface defects. Among them, the electromagnetic scattering caused by edge is an outstanding problem compared to other defect types which can be repaired by filling and coating material in a small area [7,8].…”

Section: Introductionmentioning

confidence: 99%

A Low RCS Design under a Large Incident Angle for the Curved Surface Edge Considering Edge Effects

2024

PIER Letters

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In the context of the backscatter problem caused by edge diffraction on metallic curved surface, this study proposes a method to mitigate the scattering effect by loading different metasurface structures in four equally divided regions along the surface edge. Based on the design of the loaded metasurface on the curved surface, the interaction between the reflection field on the surface and the diffracted field is regulated by adjusting two key parameters: the reference phase (φ0) at the edge and the phase difference (φ d ) in adjacent regions. By controlling these parameters, reduction in the monostatic radar cross-section (RCS) can be achieved when the metasurface is loaded onto the curved surface. By controlling the reflection phase of a sandwich-like unit structure subjected to oblique incidence of electromagnetic waves, a metasurface that meets the requirements has been designed. Through a comparison and analysis of the near field and monostatic radar cross-section before and after loading the metasurface, the effectiveness of this design method is confirmed. This method is of great significance to control the electromagnetic scattering caused by edge diffraction.

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Section: Introductionmentioning

confidence: 99%

A Low RCS Design under a Large Incident Angle for the Curved Surface Edge Considering Edge Effects

2024

PIER Letters

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“…Electrically-large open-ended cavity (EOC) is often modelled as a section of waveguide, open on one end and terminated by a flat conducting plate on the other. EOC is widely applied in such parts of aircraft as inlet and nozzle, which critical enhances the RCS of a target due to its strong backscattering property [3][4][5][6][7]. Therefore, it is necessary to design a low backscattering EOC to improve the stealth of aircrafts.…”

Section: Introductionmentioning

confidence: 99%

Broadband RCS reduction for electrically-large open-ended cavity using random coding metasurfaces

Zhou¹,

Yan²,

Xie³

et al. 2019

J. Phys. D: Appl. Phys.

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A scattered radar signal by an electrically-large open-ended cavity involves information of the target. Therefore, controlling the Radar cross section (RCS) of the cavity is significant for target stealth. Coding metasurfaces have promised great possibilities for full control of the electromagnetic waves, especially for reducing RCS by random coding metasurfaces. Here, we report an approach to realize broadband RCS reduction of electrically-large openended cavities through loading random coding metasurfaces on the inner side walls. The RCS reduction is caused by suppressing the strong backscattering of corner reflectors inside the cavities, which is further attributed to the diffuse reflection performance of the random coding metasurfaces. Both simulation and measurement show a decrease of cavities RCS, which is a broadband (X-band), polarization-independent, high performance (10 dB) RCS reduction. The proposed method may create new opportunities to improve microwave stealth features of cavities working in high temperatures, which could provide crucial benefits in many practical uses, such as engine nozzles.

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The modelling and the electromagnetic scattering from bifurcated open-ended cavities

Chou¹

1994

Int. J. Numer. Model.

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Ray-based methods have been previously developed for accurately predicting the electromagnetic scattering from cavity interiors that allowed for realistic modelling of complex cavities such as jet engine inlets. An analytic geometric model is developed for bifurcated cavities based on connecting sections of generalized super-ellipse functions. The electromagnetic scattering from such cavities using the 'shooting and bouncing rays' (SBR) method is discussed. BASIC SUPER-ELLIPSE CAVITY MODELThis section describes the mathematics of the basic super-ellipse cavity model that is used as a building block in the modelling of the bifurcated duct geometry of Figure 1. A super-ellipse can be defined on the x-y plane by:

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Radar cross‐section reduction studies of partially open cavity structures

Cited by 7 publications

References 6 publications

A Low RCS Design under a Large Incident Angle for the Curved Surface Edge Considering Edge Effects

A Low RCS Design under a Large Incident Angle for the Curved Surface Edge Considering Edge Effects

Broadband RCS reduction for electrically-large open-ended cavity using random coding metasurfaces

The modelling and the electromagnetic scattering from bifurcated open-ended cavities

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