Results 11 to 20 of about 3,353,562 (125)
A Wide Frequency Scanning Printed Bruce Array Antenna with Bowtie and Semi-Circular Elements
Sensors, 2020 A printed edge-fed counterpart of the wire Bruce array antenna, for frequency scanning applications, is presented in this paper. The unit-cell of the proposed antenna consists of bowtie and semi-circular elements to achieve wide bandwidth from below 22 ...
Zeeshan Ahmed +2 more
doaj +1 more source
Chip-scale atomic diffractive optical elements
Nature Communications, 2019 Quantum coherence and the nonlinear properties of atoms are highly useful in optical devices. Here the authors show quantum-optic hybrid platforms in fully integrated chip-scale atomic diffractive optical elements by embedding hot atomic Rb vapor in ...
Liron Stern +4 more
doaj +1 more source
Investigation of Frequency Scanning Printed Bruce Array Antenna
IEEE Access, 2020 A printed edge-fed counterpart of wire Bruce array antenna, with open-stopband mitigation at broadside, is presented. The proposed antenna comprises of 11 meandered unit-cells periodically modulated in congruence with wire Bruce array antenna's theory ...
Zeeshan Ahmed +3 more
doaj +1 more source
Toward Applicable EEG-Based Drowsiness Detection Systems: A Review
Frontiers in Biomedical Technologies, 2022 Purpose: Drowsy driving accounts for many accidents and has attracted substantial research attention in recent years. Electroencephalography (EEG) signals are shown to be a reliable measure for the early detection of drowsiness.
Nasrin Sheibani Asl +3 more
doaj +1 more source
Calibration to Mitigate Near-Field Antennas Effects for a MIMO Radar Imaging System
Sensors, 2021 A calibration method for a high-resolution hybrid MIMO turntable radar imaging system is presented. A line of small metal spheres is employed as a test pattern in the calibration process to measure the position shift caused by undesired antenna effects ...
Ha Hoang +3 more
doaj +1 more source
The Journal of Engineering, 2019 Many applications of wireless power transmission (WPT) require high misalignment tolerance. However, the transmission power of WPT is highly susceptible to the misalignment.
Jinbo Zhao +11 more
doaj +1 more source
Single-cycle all-fiber frequency comb
APL Photonics, 2021 Single-cycle pulses with a deterministic carrier-envelope phase enable the study and control of light–matter interactions at the sub-cycle timescale, as well as the efficient generation of low-noise multi-octave frequency combs.
Sida Xing +6 more
doaj +1 more source
Doppler Shift Tolerance of Typical Pseudorandom Binary Sequences in PMCW Radar
Sensors, 2022 In the context of all-digital radar systems, phase-modulated continuous wave (PMCW) based on pseudorandom binary sequences (PRBSs) appears to be a prominent candidate modulation scheme for applications such as autonomous driving.
Lucas Giroto de Oliveira +9 more
doaj +1 more source
Broadband 1-GHz mid-infrared frequency comb
Light: Science & Applications, 2022 Mid-infrared (MIR) spectrometers are invaluable tools for molecular fingerprinting and hyper-spectral imaging. Among the available spectroscopic approaches, GHz MIR dual-comb absorption spectrometers have the potential to simultaneously combine the high ...
Nazanin Hoghooghi +6 more
doaj +1 more source
Precise control of optical phase and coherent synthesis in femtosecond laser based optical frequency combs [PDF]
arXiv, 2022 Optical frequency combs are laser sources which are capable of generating discrete, equal-spaced and highly coherent comb modes. Optical frequency comb technique provides a significant bridge to transfer the stability between optical frequency and radio frequency. The advances of this technology greatly promote the development of precision spectroscopy,
arxiv