A Passive Compressive Device Associated With a Luneburg Lens for Multibeam Radar at Millimeter Wave

Barka, André; Méric, Stéphane; Lafond, Olivier; Himdi, Mohamed; Ferro-Famil, Laurent

doi:10.1109/lawp.2018.2824837

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…Luneburg lenses have a response that is very suitable for antenna designs [23], [24], [25], [26]. A Luneburg lens is a rotationally-symmetric graded-index lens that transforms a point source (cylindrical or spherical wave) into a plane wave at the opposite direction in which it is fed [27].…”

Section: Luneburg Lens Designmentioning

confidence: 99%

Glide-Symmetric Fully Metallic Luneburg Lens for 5G Communications at K<roman>a</roman>-Band

Quevedo–Teruel

Miao

Mattsson

et al. 2018

Antennas Wirel. Propag. Lett.

200

104

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Here, we propose a fully-metallic implementation of a Luneburg lens operating at Ka-band with potential use for 5G communications. The lens is implemented with a parallel plate that is loaded with glide-symmetric holes. These holes are employed to produce the required equivalent refractive index profile of a Luneburg lens. Glide symmetry and inner metallic pins are employed to increase the equivalent refractive index. The lens is fed with rectangular waveguides designed to match the height of the parallel plate, and it is ended with a flare to minimize the reflections.

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Section: Luneburg Lens Designmentioning

confidence: 99%

Glide-Symmetric Fully Metallic Luneburg Lens for 5G Communications at K<roman>a</roman>-Band

Quevedo–Teruel

Miao

Mattsson

et al. 2018

Antennas Wirel. Propag. Lett.

200

104

View full text Add to dashboard Cite

show abstract

“…In the past, we have demonstrated several coded aperture modalities, such as cavity-backed metasurface antennas [28][29][30], printed planar metasurface antennas [31,32], and Mills-Cross shaped metasurface antennas [33,34]. Recently, the application of a Luneburg lens loaded 1D compressive device radiating a multi-beam azimuth radiation pattern controlled by the multiple input ports of the Luneburg lens has also been demonstrated as an interesting example [35]. A crucial aspect in governing the quality of the reconstructed images using our coded apertures [28][29][30][31][32][33][34], which can do 3D imaging with a single compressed channel, is the information capacity of the aperture used to encode the back-scattered measurements.…”

Section: Introductionmentioning

confidence: 99%

Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

et al. 2020

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Computational imaging using coded apertures offers all-electronic operation with a substantially reduced hardware complexity for data acquisition. At the core of this technique is the single-pixel coded aperture modality, which produces spatio-temporarily varying, quasi-random bases to encode the back-scattered radar data replacing the conventional pixel-by-pixel raster scanning requirement of conventional imaging techniques. For a frequency-diverse computational imaging radar, the coded aperture is of significant importance, governing key imaging metrics such as the orthogonality of the information encoded from the scene as the frequency is swept, and hence the conditioning of the imaging problem, directly impacting the fidelity of the reconstructed images. In this paper, we present dielectric lens loading of coded apertures as an effective way to increase the information coding capacity of frequency-diverse antennas for computational imaging problems. We show that by lens loading the coded aperture for the presented imaging problem, the number of effective measurement modes can be increased by 32% while the conditioning of the imaging problem is improved by a factor of greater than two times.

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“…To overcome these limitations, computational techniques were implemented to reduce the number of active chains required for interferometric imaging systems by adding various types of components for encoding signals into the physical layer quoting code-modulated arrays [16], frequency dispersive reflectarray antennas [17], dynamic metasurfaces [18] and electrically large metallic multiplexing cavities [19]- [23]. The latter is based on the use of passive coding devices initially developed in the microwave domain and then adapted to the millimeter wave range [24]- [26].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Millimeter-Wave Computational Interferometric Imaging

et al. 2020

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Recently a progress in computational imaging has been noticed with the potential to improve the capabilities of millimeter-wave imaging systems. In this paper, an interferometric synthetic aperture systems is considered to be the conventional approach to image reconstruction that, in order to overcome its cost limitations and system complexity, both hardware and digital post-processing solutions are offered. A passive multiplexing cavity is added to encode received signals into the physical layer helping to reduce the number of measurement ports and thus the active RF chains without affecting the initial number of receiving antennas. This proposed technique leads to inverse problem solving process. A novel numerical method is then developed, based on a matrix formalism yielding a mathematical description of the computational approach. A numerical study is therefore performed to approve the feasibility of this technique for a better image reconstruction followed by an experimental study carried out at 92 GHz as a proof of concept.

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A Passive Compressive Device Associated With a Luneburg Lens for Multibeam Radar at Millimeter Wave

Cited by 16 publications

References 11 publications

Glide-Symmetric Fully Metallic Luneburg Lens for 5G Communications at K<roman>a</roman>-Band

Glide-Symmetric Fully Metallic Luneburg Lens for 5G Communications at K<roman>a</roman>-Band

Lens-Loaded Coded Aperture with Increased Information Capacity for Computational Microwave Imaging

Enhancing Millimeter-Wave Computational Interferometric Imaging

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