Results 31 to 40 of about 1,257,379 (230)
RIPless Based Radar Waveform Analysis in Sparse Microwave Imaging
Leida xuebao, 2013 The echo data can be modeled as the product of the Toeplitz matrix and reflectivity of the observed scene. The row of the Toeplitz matrix is the time-shift of the transmitted signal.
Zhao Yao +3 more
doaj +1 more source
Atomic resolution imaging at 2.5 GHz using near-field microwave microscopy
, 2010 Atomic resolution imaging is demonstrated using a hybrid scanning tunneling/near-field microwave microscope (microwave-STM). The microwave channels of the microscope correspond to the resonant frequency and quality factor of a coaxial microwave resonator,
Lee, Jonghee +4 more
core +1 more source
Variable frequency microwave (VFM) processing facilities and application in processing thermoplastic matrix composites [PDF]
, 2003 Microwave processing of materials is a relatively new technology advancement alternative that provides new approaches for enhancing material properties as well as economic advantages through energy savings and accelerated product development.
Ball, J. A. R. +3 more
core +1 more source
SNR‐dependent drone classification using convolutional neural networks
IET Radar, Sonar & Navigation, 2022 Radar sensing offers a method of achieving 24‐h all‐weather drone surveillance, but in order to be maximally effective, systems need to be able to discriminate between birds and drones.
Holly Dale +5 more
doaj +1 more source
IEEE Journal of MicrowavesThis article presents a reconfigurable unit cell for transmitarrays at $10 \,\mathrm{GHz}$ based on the fishnet metamaterial structure. The proposed design achieves a phase shift of up to $180 \mathrm{^{\circ }}$ between different states and additional ...
Adrian Diepolder +5 more
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A Ku Wideband Circularly Polarized Microstrip Antenna Array with Low Profile Crossed-Dipole Element
International Journal of Antennas and Propagation, 2023 This paper presents a novel Ku wideband circularly polarized (CP) antenna array composed of crossed-dipole element (CDE) and fed through sequential rotation (SR) feeding technique.
Haipeng Liu, Yunhua Zhang, Xiaowen Zhao
doaj +1 more source
IEEE Journal of MicrowavesThis article presents a novel transmission-only calibration technique for free-space quasi-optical material characterization, based on rotating the sample around its axis to vary the angle of incidence under which the sample is illuminated.
Adrian Diepolder +5 more
doaj +1 more source
Wide Band Polarization Detector for Sub–6 GHz 5G Applications
IEEE Access, 2022 This paper presents the analysis and the design of a polarization detector for sub–6 GHz 5G applications. The proposed design operates in the frequency range from 2 to 4 GHz to cover the 5G NR frequency bands n40/n41/n78. The proposed polarization
Eman M. Eldesouki +3 more
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Spacial Energy Distribution Manipulation with Multi-focus Huygens Metamirror
Scientific Reports, 2017 Huygens metasurface is a planar array of crossed electric and magnetic dipoles, which provide specific surface current to tailor the electromagnetic field distribution.
Zhuochao Wang +3 more
doaj +1 more source
Sea Spike Suppression Method Based on Optimum Polarization Ratio in Airborne SAR Images
Sensors, 2021 In the condition of ocean observation for high-resolution airborne synthetic aperture radar (SAR), sea spikes will cause serious interference to SAR image interpretation and marine target detection. In order to improve the ability of target detection, it
Yawei Zhao +4 more
doaj +1 more source