Results 11 to 20 of about 156,538 (310)
Nonlinear phased array imaging [PDF]
SPIE Proceedings, 2016 A technique is presented for imaging acoustic nonlinearity within a specimen using ultrasonic phased arrays. Acoustic nonlinearity is measured by evaluating the difference in energy of the transmission bandwidth within the diffuse field produced through different focusing modes.
Croxford, Anthony +2 more
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Phased-Array antenna beam squinting related to frequency dependency of delay circuits [PDF]
, 2011 -Practical time delay circuits do not have a perfectly linear phase-frequency characteristic. When these delay circuits are applied in a phased-array system, this frequency dependency shows up as a frequency dependent beam direction (“beam squinting ...
Garakoui, Seyed Kasra +3 more
core +8 more sources
Microstrip patch antenna array for range extension of RFID applications [PDF]
, 2008 In this paper, an UHF band 2X2 microstrip phased antenna array is designed for extending the range of an RFID reader system. The phased antenna array operates at the frequency of 867 MHz, as specified in Gen2 protocol European standards.
Abbak, Mehmet +2 more
core +1 more source
Research on factors affecting ultrasonic phased array detection imaging quality for curved component
AIP Advances, 2022 An in-depth analysis on the beam directivity of ultrasonic phased arrays has been made to solve the problems of low image quality and identification difficulties caused by a suboptimal configuration of array elements.
Zhe Wang, Chao Zhang, Xiahui Li
doaj +1 more source
Multiprobe Radiation Simulation Method for Phased Array Radar Performance Evaluation
IEEE Access, 2022 The phased array radar exhibits improved tracking accuracy and anti-jamming performance with multi-beam tracking, beam agility, and adaptive beam-forming capabilities.
Ruoxi Xu +4 more
doaj +1 more source
RFID coverage extension using microstrip-patch antenna array [PDF]
, 2009 In this paper, a UHF-band 2 x 2 microstrip phased-array antenna is designed and implemented to extend the coverage of an RFID reader system. The phased-array antenna has four microstrip-patch antennas, three Wilkinson power dividers, and a transmission ...
Abbak, Mehmet +2 more
core +1 more source
Frontiers in Communications and Networks, 2023 The impact of the substrate dielectric material on the performance of a wideband magneto-electric dipole (MED) phased array antenna is systematically studied in this article. Four commercially available dielectric substrates for mmWave applications, i.e.,
Wai Yan Yong +2 more
doaj +1 more source
Phased array ghost elimination [PDF]
NMR in Biomedicine, 2006 AbstractParallel imaging may be applied to cancel ghosts caused by a variety of distortion mechanisms, including distortions such as off‐resonance or local flow, which are space variant. Phased array combining coefficients may be calculated that null ghost artifacts at known locations based on a constrained optimization, which optimizes SNR subject to ...
Peter, Kellman, Elliot R, McVeigh
openaire +2 more sources
Self-cross Phase Calibration Method of Oversized Front Distributed Phased Array Radar
Leida xuebao, 2013 For oversized front distributed phased array radar, the conventional phased array radar calibration algorithm can not work. This paper presents the combination of self-calibration and cross-calibration algorithm.
Yan Zhou-jie +3 more
doaj +1 more source
Development Toward a Ground-Based Interferometric Phased Array for Radio Detection of High Energy Neutrinos [PDF]
, 2017 The in-ice radio interferometric phased array technique for detection of high energy neutrinos looks for Askaryan emission from neutrinos interacting in large volumes of glacial ice, and is being developed as a way to achieve a low energy threshold and a
Avva, J. +18 more
core +2 more sources