A Luneburg Lens for the Terahertz Region
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Infrared, Millimeter, and Terahertz Waves"
DOI: 10.1007/s10762-019-00635-8
Abstract: We experimentally demonstrate a two-dimensional Luneburg lens for the THz region using a waveguide-based artificial-dielectric medium. The substrate material of the lens is Teflon with the top and bottom surfaces coated with silver to form… read more here.
Keywords: terahertz region; lens terahertz; luneburg lens; region ... See more keywords
Ultrabroadband Three-Dimensional Printed Radial Perfectly Symmetric Gradient Honeycomb All-Dielectric Dual-Directional Lightweight Planar Luneburg Lens.
Sign Up to like & getrecommendations! Published in 2018 at "ACS applied materials & interfaces"
DOI: 10.1021/acsami.8b11239
Abstract: An ultrabroadband all-dielectric planar Luneburg lens has been designed and fabricated in this study, which is in the form of a radial gradient lightweight honeycomb column. Because of the novel design of a radial symmetric… read more here.
Keywords: honeycomb; gradient; luneburg lens; planar luneburg ... See more keywords
Broadband wide-angle terahertz antenna based on the application of transformation optics to a Luneburg lens
Sign Up to like & getrecommendations! Published in 2021 at "Scientific Reports"
DOI: 10.1038/s41598-021-84849-8
Abstract: The design of antennas for terahertz systems remains a significant challenge. These antennas must provide very high gain to overcome significant free-space path loss, which limits their ability to broadcast or receive a beam over… read more here.
Keywords: wide angle; luneburg lens; transformation optics; optics ... See more keywords
A broadband metasurface Luneburg lens for microwave surface waves
Sign Up to like & getrecommendations! Published in 2017 at "Applied Physics Letters"
DOI: 10.1063/1.5003571
Abstract: A broadband planar microwave Luneburg lens made of a three-layer metasurface with hexagonal symmetry is presented. This metasurface supports a transverse-electric mode confined to the surface that presents very low dispersion and a stable mode… read more here.
Keywords: luneburg lens; broadband metasurface; metasurface; metasurface luneburg ... See more keywords
Experimental demonstration of Luneburg lens based on hyperuniform disordered media
Sign Up to like & getrecommendations! Published in 2019 at "Applied Physics Letters"
DOI: 10.1063/1.5055295
Abstract: Hyperuniformity provides a means of categorizing many nanostructures including nano-composite materials, and the design methodology based on hyperuniform randomness often leads to devices with extraordinary characteristics. In this work, we numerically and experimentally demonstrate that… read more here.
Keywords: luneburg lens; experimental demonstration; hyperuniform disordered; based hyperuniform ... See more keywords
Anisotropic glide-symmetric substrate-integrated-holey metasurface for a compressed ultrawideband Luneburg lens
Sign Up to like & getrecommendations! Published in 2021 at "Applied Physics Letters"
DOI: 10.1063/5.0041586
Abstract: An anisotropic unit cell based on glide symmetry is proposed for tailoring a metasurface that engineers an optically transformed Luneburg lens. Thanks to the optical transformation, the size of the lens is reduced by 25%.… read more here.
Keywords: luneburg lens; anisotropic glide; glide symmetric; metasurface ... See more keywords
Luneburg-lens-like structural Pauli attractive core of the nuclear force at short distances
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review C"
DOI: 10.1103/physrevc.95.044002
Abstract: The nuclear force has been understood to have a repulsive core at short distances, similar to a molecular force, since Jastrow proposed it in 1951. The existence of the repulsion was experimentally confirmed from the… read more here.
Keywords: short distances; luneburg lens; lens like; nuclear force ... See more keywords
Wide-Angle Ceramic Retroreflective Luneburg Lens based on Quasi-Conformal Transformation Optics for mm-Wave Indoor Localization
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Access"
DOI: 10.1109/access.2022.3166509
Abstract: This paper presents a quasi-conformal transformation optics (QCTO) based three-dimensional (3D) retroreflective flattened Luneburg lens for wide-angle millimeter-wave radio-frequency indoor localization. The maximum detection angle and radar cross-section (RCS) are investigated, including an impedance matching… read more here.
Keywords: transformation optics; conformal transformation; optics; wide angle ... See more keywords
Direction-of-Arrival Estimation With Planar Luneburg Lens and Waveguide Metasurface Absorber
Sign Up to like & getrecommendations! Published in 2023 at "IEEE Access"
DOI: 10.1109/access.2023.3252092
Abstract: Direction of arrival (DOA) estimation using array antennas is known to have high resolution. However, these algorithms require high computational resources. This paper proposes a unique DOA estimation system without a sophisticated algorithm, using a… read more here.
Keywords: metasurface absorber; planar luneburg; estimation; luneburg lens ... See more keywords
A Passive Compressive Device Associated With a Luneburg Lens for Multibeam Radar at Millimeter Wave
Sign Up to like & getrecommendations! Published in 2018 at "IEEE Antennas and Wireless Propagation Letters"
DOI: 10.1109/lawp.2018.2824837
Abstract: A $4 \times 1$ passive compressive device (PCD), which works at millimeter wave, is proposed in this study. In a passive manner, the device allows to compress the signals from four separated channels into a… read more here.
Keywords: luneburg lens; millimeter wave; passive compressive; compressive device ... See more keywords
3-D Printed Cylindrical Luneburg Lens for Dual Polarization
Sign Up to like & getrecommendations! Published in 2021 at "IEEE Antennas and Wireless Propagation Letters"
DOI: 10.1109/lawp.2021.3065938
Abstract: In this letter, a 2-D Luneburg lens sandwiched by two parallel metallic plates is proposed. To support both the vertical and the horizontal polarizations, parallel plate waveguide (PPW) theory is applied to analyze the proposed… read more here.
Keywords: luneburg lens; height lens; cylindrical luneburg; polarization ... See more keywords