Results 81 to 90 of about 735,881 (338)

A 300 GHz "Always-in-Focus" Focusing System for Target Detection [PDF]

, 2013
A focusing system for a 300 GHz radar with 5 m target distance and 10 mm diameter spot size resolution is proposed. The focusing system is based on a Gaussian telescope scheme and its main parameters have been de¬signed using Gaussian beam quasi-optical ...
Garcia-Muñoz, L. E., Montero-de-Paz, J., Segovia-Vargas, D.   +2 more
core   +1 more source

Non‐Equilibrium Synthesis Methods to Create Metastable and High‐Entropy Nanomaterials

Advanced Science, EarlyView.
ABSTRACT Stabilizing multiple elements within a single phase enables the creation of advanced materials with exceptional properties arising from their complex composition. However, under equilibrium conditions, the Hume–Rothery rules impose strict limitations on solid‐state miscibility, restricting combinations of elements with mismatched crystal ...
Shuo Liu, Chaochao Dun, Jeffrey J. Urban, Mark T. Swihart   +3 more
wiley   +1 more source

Progress in integrated-circuit horn antennas for receiver applications. Part 1: Antenna design [PDF]

The purpose of this work is to present a systematic method for the design of multimode quasi-integrated horn antennas. The design methodology is based on the Gaussian beam approach and the structures are optimized for achieving maximum fundamental ...
Ali-Ahmad, Walid Y., Eleftheriades, George V., Rebeiz, Gabriel M.   +2 more
core   +1 more source

XOR‐Logic Phase Coding Programmable Metasurface for Low Power‐Consumption Systems

Advanced Science, EarlyView.
By leveraging XOR logic, the biasing‐network complexity of 2D programmable metasurfaces is reduced from m×n to m+n through efficient row‐column control. This enables versatile functions including beam deflection and beamforming, facilitating applications in wireless communications and beyond.
Ruichao Zhu, Sai Sui, Junyan Dai, Qunyan Zhou, Yuxiang Jia, Yajuan Han, Yuxi Li, Shaojie Wang, Qiang Cheng, Jiafu Wang, Tie Jun Cui   +10 more
wiley   +1 more source

Horn array antenna with high aperture efficiency and suppressed grating lobes

IET Microwaves, Antennas & Propagation
In the design of horn array antennas, usually there is a challenge with the grating lobe problem and consequently quite low aperture efficiency. A new configuration for horn array antennas is presented which introduces high aperture efficiency with ...
Mohamad Hossein Anjomshoa, Seyed Ali Razavi Parizi   +1 more
doaj   +1 more source

Scattering characteristics of antennas in cyberspace

工程科学学报, 2020
5G network technology can meet the high requirements of cyberspace development in the performance of communication platforms. Massive MIMO (multiple-input multiple-output) antenna array is one of the core technologies of 5G. The mutual coupling effect of
Jian-zhong CHAI, Hang-yu CHEN, Hao-hui HONG, Xu CHAO, Jing-cheng ZHAO   +4 more
doaj   +1 more source

Broadband Achromatic Programmable Electromagnetic Camouflage via Fluidic‐Accessible Metasurface

Advanced Science, EarlyView.
A fluidic access metasurface enables dynamic, broadband electromagnetic illusions. By physically reconstructing conductive patterns with liquid metal, the metasurface achieves real‐time, pixel‐level control over phase dispersion. This allows for the programmable generation of arbitrary strong scattering point arrays, effectively deceiving high ...
Shipeng Liu, Jiahao Zhang, Jiale Wang, Zeyao Chen, Zhaotong Yu, Jinhong Luo, Jiabao Luo, Rujia Cao, Shuxi Gong, Qingxin Guo, Ping Li, Rujiang Li, Ke Chen, Yongtao Jia, Ying Liu   +14 more
wiley   +1 more source

Substrate Integrated Waveguide Horn Antenna for 60 GHz Band [PDF]

, 2015
The paper presents the design and fabrication of a H-plane substrate integrated waveguide (SIW) horn antenna. The antenna operates at 60 GHz band and is equipped with a SIW-to-WR15 transition. Experimental results prove that the antenna achieves the gain
Lambor, J.
core  

Optical horn antennas for efficiently transferring photons from a quantum emitter to a single-mode optical fiber.

Optics Express, 2013
We theoretically demonstrate highly efficient optical coupling between a single quantum emitter and a monomode optical fiber over remarkably broad spectral ranges by extending the concept of horn antenna to optics.
T. Grosjean, M. Mivelle, G. Burr, F. Baida   +3 more
semanticscholar   +1 more source

Non‐Uniform Space‐Time‐Coding Modulation for Low‐Complexity Diagnostics of Reconfigurable Intelligent Surfaces

Advanced Electronic Materials, EarlyView.
A diagnostic method for reconfigurable intelligent surfaces (RIS) based on non‐uniform space‐time‐coding modulation is presented. Fault localization is achieved via amplitude‐only spectral measurements, eliminating the need for complex signal processing. A one‐to‐one mapping between harmonic components and RIS elements enables accurate detection.
Xiao Qing Chen, Lei Zhang, Yi Ning Zheng, Bing Bing Zhu, Marco Rossi, Giuseppe Castaldi, Shuo Liu, Vincenzo Galdi, Tie Jun Cui   +8 more
wiley   +1 more source