Results 61 to 70 of about 19,229 (302)

Scaling up MIMO: Opportunities and Challenges with Very Large Arrays [PDF]

, 2012
This paper surveys recent advances in the area of very large MIMO systems. With very large MIMO, we think of systems that use antenna arrays with an order of magnitude more elements than in systems being built today, say a hundred antennas or more ...
Buon Kiong Lau, Buon Kiong Lau, Buon Kiong Lau, Daniel Persson, Daniel Persson, Daniel Persson, Erik G. Larsson, Erik G. Larsson, Erik G. Larsson, Fredrik Rusek, Fredrik Rusek, Fredrik Rusek, Fredrik Tufvesson, Fredrik Tufvesson, Ove Edfors, Ove Edfors, Post Print, Thomas L. Marzetta, Thomas L. Marzetta, Thomas L. Marzetta   +19 more
core   +2 more sources

High Entropy Wide‐Bandgap Borates with Broadband Luminescence and Large Nonlinear Optical properties

Advanced Functional Materials, EarlyView.
High‐entropy rare‐earth borates exhibit excellent nonlinear optical and broadband luminescence properties arising from multi‐component doping, chemical disorder, increased configurational entropy, and increased lattice and electronic anharmonicity. This formulation enabled us to obtain a large, environmentally stable single crystal with 3X higher laser‐
Saugata Sarker, Yu Wang, Yongwen Sun, Caeli Benyacko, Saeed S.I. Almishal, Tao Zhou, Zhiyu Zhang, Jadupati Nag, Himirkanti Sarkar, Jeffrey Shallenberger, Hemant Yennawar, Yang Yang, Jon‐Paul Maria, Zhiqiang Mao, Venkatraman Gopalan   +14 more
wiley   +1 more source

Phased Array Feed Calibration, Beamforming and Imaging [PDF]

, 2009
Phased array feeds (PAFs) for reflector antennas offer the potential for increased reflector field of view and faster survey speeds. To address some of the development challenges that remain for scientifically useful PAFs, including calibration and ...
Alan Stemmons, Borthakur, Brian D. Jeffs, Chynoweth, Dame, David Jones, Ellingson, Ellingson, Fisher, Fisher, Gilmon, Hay, J. Richard Fisher, Jacob Waldron, Jeffs, Jeffs, Jeffs, Jonathan Landon, Karl F. Warnick, Landon, Landon, Leshem, Leshem, Liszt, Lockman, Michael Elmer, Murphy, Oosterloo, Poulsen, Putman, Roddy, Roger D. Norrod, Taylor, Thilker, Van Trees, Verheijen, Waldron, Warnick, Warnick, Willis, Woestenburg, Zhang, Zhang   +42 more
core   +1 more source

The Cuttlebone Blueprint for Multifunctional Metamaterials: Design Taxonomy, Functional Decoupling, and Future Horizons

Advanced Functional Materials, EarlyView.
Cuttlebone‐inspired metamaterials exploit a septum‐wall architecture to achieve excellent mechanical and functional properties. This review classifies existing designs into direct biomimetic, honeycomb‐type, and strut‐type architectures, summarizes governing design principles, and presents a decoupled design framework for interpreting multiphysical ...
Xinwei Li, Zhendong Li
wiley   +1 more source

Application of Metamaterial Wall for Mutual Coupling Mitigation of a Dual Differential Fed 2×2 Patch Array Antenna

IEEE Access
An effective technique for mutual coupling mitigation in a $2\times 2$ dual differential fed patch antenna array (DDFPAA) is presented. Metamaterial walls are placed between the radiating elements of an array in the two orthogonal planes of the antenna
Kam Eucharist Kedze, Wenyu Zhou, Nima Javanbakht, George Xiao, Eqab Almajali, Jim S. Wight, Jafar Shaker, Rony E. Amaya   +7 more
doaj   +1 more source

Decoupling of Multifrequency Dipole Antenna Arrays for Microwave Imaging Applications

International Journal of Antennas and Propagation, 2010
The mutual coupling between elements of a multifrequency dipole antenna array is experimentally investigated by S-parameter measurements and planar near-field scanning of the radiated field. A multifrequency array with six dipoles is analyzed.
E. Saenz, K. Guven, E. Ozbay, I. Ederra, R. Gonzalo   +4 more
doaj   +1 more source

Improved mutual coupling compensation in compact antenna arrays

IET Microwaves, Antennas & Propagation, 2010
A new method for the characterisation of receiving mutual impedances of compact arrays with omni-directional antenna elements is proposed. Based on a large number of incident waves coming from different directions, the new method is able to calculate the receiving mutual impedances of omni-directional antennas based on a system of equations that ...
Lui, H.-S., Hui, H. T.
openaire   +2 more sources

Advances in Bioprinting to Model Immune‐Mediated Skin Diseases

Advanced Healthcare Materials, EarlyView.
This review explores how 3D bioprinting drives innovation in developing in vitro skin models that mimic immune‐mediated diseases. It highlights current technologies, key applications in studying skin pathologies, and emerging challenges. The review points toward future opportunities for improving disease modeling and advancing therapeutic and cosmetic ...
Andrea Ulloa‐Fernández, Marica Markovic, Julia Fernández‐Pérez, Georg Stary, Aleksandr Ovsianikov   +4 more
wiley   +1 more source

A New 3D Colon on a Chip to Decipher the Influence of Mechanical Forces on the Physiological Cellular Ecosystem

Advanced Healthcare Materials, EarlyView.
To dissect how mechanical forces influence intestinal physiology, we developed a stretchable 3D colon‐on‐chip that integrates tunable topography, stiffness and peristalsis‐like motion within a physiologically relevant microenvironment. We showed that stretching is a dominant factor governing epithelial behavior, markedly enhancing proliferation and ...
Moencopi Bernheim‐Dennery, Lauriane Gérémie, Julie Brun, Lucas Chassatte, Giacomo Gropplero, Réda Bouras, Jieun Choo, Bertrand Cinquin, Alba Marcellan, Danijela Matic Vignjevic, Stéphanie Descroix   +10 more
wiley   +1 more source

Stochastic framework for evaluating the effect of displaced antenna elements on DOA estimation [PDF]

, 2017
We establish a statistical framework for investigating the influence of correlated random displacements of antenna elements in a uniform circular antenna array (UCA) on the distribution of direction-of-arrival (DOA) estimates. More specifically, we apply
Bruneel, Herwig, Inghelbrecht, Veronique, Moeneclaey, Marc, Rogier, Hendrik, Van Hecke, Tanja, Verhaevert, Jo   +5 more
core   +2 more sources