Ground-plane-backed hemispherical Luneberg-lens reflector

Liang, C.S.; Streater, Donald A.; Jin, Jian‐Ming; Dunn, Eric; Rozendal, T.

doi:10.1109/map.2006.1645559

Cited by 10 publications

(3 citation statements)

References 5 publications

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“…[21][22][23] Due to the functions of focusing and collimation, dielectric lens can be used as the retroreflector. Examples are Luneburg lens or homogeneous dielectric sphere with a metallic cap around their focal point, [24][25][26] ground-backed hemispherical Luneburg lens, 27 and metamaterial lens. 28 Furthermore, the photonic jet was recently reported to enhance the backscattering from particles and metallic wires by focusing a beam with high intensity.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of backscattering by a conducting cylinder coated with gradient metasurface

Shang

Shen

Feng

2016

Journal of Applied Physics

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This paper proposes a highly effective method for enhancing the backscattering by a conducting cylinder that is coated with a gradient metasurface. The employed metasurface exhibits a phase gradient continuously varying along the circumferential direction of the cylinder so that in-phase retroreflection can be produced to enhance the backscattering. It is demonstrated that the cylinder coated with the proposed gradient metasurface can generate backscattering very close to that from a conducting plate with the same dimensions as the cylinder's cross-section perpendicular to the incident plane wave. Compared with a bare conducting cylinder, the backscattering is significantly enhanced by the gradient metasurface made of conducting strips printed on a grounded dielectric substrate. Effects of cell numbers along the cylinder axis, incident angle, and polarization of the incoming electromagnetic wave on the backscattering enhancement are examined and discussed. A good agreement between simulated and measured backscattering results validates the observations.

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Section: Introductionmentioning

confidence: 99%

Enhancement of backscattering by a conducting cylinder coated with gradient metasurface

Shang

Shen

Feng

2016

Journal of Applied Physics

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“…However, the increased drag caused by the large dimensions of these devices is a main disadvantage to them for installation onto moving platforms. Besides, hemispherical [7] and active [8] Luneburg lenses, an electromagnetic scatterer with switch-loaded metallic strips placed above a copper plate [9], and a flat reflector based on reflectarray [10] were also reported as scattering enhancement devices. For airborne applications, an open cavity on the wing surface of an unmanned air vehicle was proposed to enhance the scattering [3], while limited information was presented.…”

Section: Introductionmentioning

confidence: 99%

Edge-On Backscattering Enhancement Based on Quasi-Superdirective Reradiation

Shang

Xiao

Shen

2015

Antennas Wirel. Propag. Lett.

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A concept based on superdirective reradiation is presented for the sake of backscattering enhancement of a thin conducting plate at edge-on incidence. A passive structure consisting of a thin plate loaded with two conducting posts is proposed to demonstrate the concept. Through properly choosing the heights of two posts and the spacing between them, it is observed that the induced surface currents on the two loaded posts are almost 180 out of phase. An obvious enhancement of backscattering can then be obtained as a result of the quasi-superdirective reradiation produced by induced currents on the two loaded posts with each post height shorter than a quarter-wavelength. The induced current distribution is explained by virtue of the image method. Relatively small dimensions of the loaded posts make the design concept appropriate to the backscattering enhancement for airborne applications. The agreement between simulated and measured results validates our design.Index Terms-Backscattering enhancement, superdirective reradiation, thin plate scattering.

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“…The near-field distribution in the case of normal incident to the Luneberg lens reflector is also numerically obtained by using the mode expansion technique and the point matching method (PMM) . Recently, a ground-plane-backed hemispherical Luneberg lens reflector was studied experimentally and also investigated by using the simulation code (Liang et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Backscattering by a Cylindrical Luneberg Lens with a Reflective Cap

et al. 2008

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The electromagnetic scattering by a cylindrical Luneberg lens with a conducting reflector is analyzed by using the point matching method. The high accuracy of the point matching method is obtained from the convergence property of the total scattering cross-section versus matrix size. It is found that the scattering pattern has a backscattered field approximately several times that of a circular cylinder of the same radius. The radar cross-section versus incident angle is illustrated, whose figure has the relatively wide conical viewing angles. It is also found that the radar cross-section becomes relatively large as the radius of the cylinder increases.

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Ground-plane-backed hemispherical Luneberg-lens reflector

Cited by 10 publications

References 5 publications

Enhancement of backscattering by a conducting cylinder coated with gradient metasurface

Enhancement of backscattering by a conducting cylinder coated with gradient metasurface

Edge-On Backscattering Enhancement Based on Quasi-Superdirective Reradiation

Electromagnetic Backscattering by a Cylindrical Luneberg Lens with a Reflective Cap

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