Results 51 to 60 of about 503,018 (197)

Reflecting Luneburg Lens: Analytical Solution and Applications

, 2021
International audienceThis paper presents the closed-form solution for a new type of lens beamformer, which consists of two stacked parallel plate waveguides (PPWs) of circular shape.
Gonzalez-Ovejero, D., Ruiz-Garcia, J., Maci S., Maci, S., David Gonzalez-Ovejero, Ruiz-Garcia J., Cristian Della Giovampaola, Stefano Maci, Martini E., Martini, E., Gonzalez-Ovejero D., Enrica Martini, Jorge Ruiz-Garcia, Giovampaola C. D., Giovampaola, C.D.   +14 more
core   +1 more source

The Effect of CEO Narcissism on the Quality of Environmental, Social, and Governance Reporting—Evidence From Listed German Companies

Corporate Social Responsibility and Environmental Management, EarlyView.
ABSTRACT This study explores how CEO narcissism—a salient individual trait within the upper echelons of corporate leadership—shapes the quality of environmental, social, and governance (ESG) reporting in large German firms. Drawing on data from 109 DAX, MDAX, and SDAX companies between 2017 and 2021 (545 firm‐year observations), we find that ...
Jennifer Zeppenfeld, Finja Lena Kind, Rainer Lueg   +2 more
wiley   +1 more source

A Discrete Cylindrical Luneburg Lens With Liquid Layers

, 2020
In this project, a cylindrical Luneburg lens isdesigned operating at optical frequencies. A Luneburg lens isa gradient index lens that transforms a point source into aplane wave or vice versa.
Normark Frisk, Curt-Herman, Algarp, Erik
core   +2 more sources

Planar Luneburg Lens Antennas for 5G and 6G Millimetre Wave Communications

, 2022
In this contribution, planar Luneburg lens antennas are discussed. It is noted that the high radiation efficiency and wide scanning capabilities of planar Luneburg lens antennas make them attractive for the next generations of communication systems.
Zetterström, Oskar,, Algaba-Brazalez, Astrid,, Quevedo-Teruel, Oscar,   +2 more
core   +1 more source

Rectangular metamaterial Luneburg lens for dual polarized multi-beam radiation based on transformation optics [PDF]

AIP Advances
This paper proposes a rectangular metamaterial Luneburg lens antenna with dual polarized multi-beam radiation. Using the transformation optics (TO) principle, the propagation of the electromagnetic wave can be arbitrarily manipulated; therefore, a ...
Bingyue Qu
doaj   +1 more source

Millimeter-Wave High-Gain Dual-Polarized Flat Luneburg Lens Antenna with Reflection Cancellation

Applied Sciences, 2023
Because of its good beam coverage and beam scanning abilities, the Luneburg lens (LL) is a promising multibeam antenna for the fifth-generation (5G) wireless communications.
Yan Zhang, Yinsen Luo, Ran Ji
doaj   +1 more source

The Path to Lean Startup Risk Management

Strategic Change, EarlyView.
ABSTRACT This paper aims to demonstrate that many startups are unaware of the potential of strategic opportunity and risk management to gain a competitive advantage. It reveals and analyzes an opportunity and risk management gap between the pre‐startup and early‐startup phases, guiding toward managerial implications.
Maximilian Wagenknecht
wiley   +1 more source

Dual‐Metasurface‐Integrated Fiber Array for Bidirectional Cylindrical‐Vector‐Beam Multiplexed Communication Using Off‐Axis Spatial Manipulation

Laser &Photonics Reviews, EarlyView.
A dual‐layer metasurface is integrated on a fiber‐array facet to realize compact, plug‐and‐play free‐space optical links with cylindrical vector beam (CVB) space‐division multiplexing. An optimized off‐axis collimation layer steers multiple channels, while a Dammann vortex layer performs polarization–topology conversion for bidirectional CVB (de ...
Xipeng Lu, Jinke Li, Jin Tae Kim, Shaoyan Li, Hongliang Li, Duk‐Yong Choi, Sang‐Shin Lee   +6 more
wiley   +1 more source

A 3D-Printed Spherical Dual-Circular Polarized Luneburg Lens Antenna for Ku-Band

IEEE Access
In this paper, we propose a novel three-dimensional-printed Luneburg lens for converting linear polarization to dual-circular polarization and successfully apply it in a multibeam antenna.
Qing Wang, Xiaohai Han, Pu Yu, Jian-Qiang Hou, Zhen-Ya Lei   +4 more
doaj   +1 more source

Rectifier Integrated Multibeam Luneburg Lens Employing Artificial Dielectric as a Wireless Power Transfer Medium at Mm Wave Band

IEEE Photonics Journal, 2021
In this paper, a rectifier integrated Luneburg lens is designed at K band for wireless power transfer (WPT) applications. The lens consists of two metallic layers with a gap of 0.3 mm between them and has been made by employing the glide symmetry ...
Sarath Sankar Vinnakota, Runa Kumari, Himanshu Meena, Basudev Majumder   +3 more
doaj   +1 more source