Results 21 to 30 of about 799,648 (306)
An Omnidirectional Near-Field Comprehensive Damage Detection Method for Composite Structures
Applied Sciences, 2019 As one of the active structural health monitoring methods based on the Lamb wave, the ultrasonic phased-array damage detection method can provide information such as damage location and range more intuitively, which is why this method is a research ...
Zhiling Wang +3 more
doaj +1 more source
Optimal E-Field Vector Combination for a Highly Focused Antenna-Array [PDF]
, 2014 A near-field highly focused circular phased-array antenna for 5.8-GHz radio frequency identification (RFID) applications is presented. The electric field (E-field) at the focus is enhanced by a constructive vector combination in a three-dimensional (3-D)
Perallos, Asier +5 more
core +1 more source
Joint Phased-MIMO and Nested-Array Beamforming for Increased Degrees-of-Freedom
International Journal of Antennas and Propagation, 2015 Phased-multiple-input multiple-output (phased-MIMO) enjoys the advantages of MIMO virtual array and phased-array directional gain, but it gets the directional gain at a cost of reduced degrees-of-freedom (DOFs).
Chenglong Zhu, Hui Chen, Huaizong Shao
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Integrated circular optical phased array [PDF]
EPJ Web of Conferences, 2021 Existing OPAs are typically based on 2D rectangular arrays or 1D linear arrays. Both approaches present a limited field-of-view (FOV) due to the presence of the grating lobes when the element spacing is larger than λ/2.
Liu Qiankun +5 more
doaj +1 more source
In-Flight Performance Monitoring of TerraSAR-X Active Phased Array Antenna [PDF]
, 2009 TerraSAR-X is a high resolution synthetic aperture radar (SAR) satellite launched in 2007. Its active phased array X-Band antenna hosts 384 transmit/receive modules (TRMs) controlling the beam shape and steering in azimuth and elevation.
Markus Bachmann +5 more
core +1 more source
Photonic wideband phased array: an optical time steered antenna based on a new true time delay unit [PDF]
, 2006 L’attività di ricerca svolta durante il corso di dottorato e descritta dettagliatamente all’interno della tesi è stata diretta al progetto di una innovativa rete ottica di formazione del fascio per antenne a schiera a banda larga esenti dal fenomeno del ...
Curcio, Claudio
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Research on an Adaptive Coupling Technique for Spatially Scattered Light
SensorsFocusing on the problems of difficult alignment and low efficiency when coupling the spatially scattered light from 532 nm underwater LiDAR to a single-mode fiber, this paper presents an analysis and simulation of the coupling principle of spatially ...
Xin Liu +6 more
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GESTRA - upgrading to future distributed phased array radar networks for space surveillance
, 2023 2734More and more objects are orbiting the Earth. Especially mega-constellations lead to a big number of artificial objects in space, both active and debris. This increasing amount of space debris is becoming more and more dangerous for human spaceflight.
Reising, Christoph +4 more
core +1 more source
应用气象学报Multi-source observational datasets, including high-frequency, minutely automatic weather stations, an X-band phased-array radar, a wind profiler radar and a microwave radiometer, are employed to analyze a typical cold-season elevated hailstorm occurred ...
Li Jian +7 more
doaj +1 more source
MATEC Web of Conferences, 2018 In order to reduce the loss of Degree of Freedom (DOF) brought by the transmit subarray splitting of two-dimensional hybrid phased-MIMO radar, this paper presents a design method of transmitting and receiving array based on nested array structure ...
Cheng Tianhao +3 more
doaj +1 more source