Results 41 to 50 of about 178,095 (274)
IEEE Journal of Microwaves, 2022 In radar and communication systems, phase noise is one of the main causes of performance degradation. Phase noise increases the uncertainty in radar measurements and limits the achievable data rates in communication systems.
Peter Tschapek +4 more
doaj +1 more source
Solid-state microwave noise radar
Electronics Letters, 1976 Microwave solid-state devices such as impatts can provide moderately high levels of noise power. A simple noise radar has been demonstrated using a cable delay line and correlator. Further experiments for greater range using variable s.a.w. delay lines and downconversion of the microwave signal are outlined.
J.R. Forrest, J.P. Meeson
openaire +1 more source
Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain
Advanced Materials, EarlyView.A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha +14 more
wiley +1 more source
Remote SensingWith the number of new satellites increasing dramatically, comprehensive space surveillance is becoming increasingly important. Therefore, high-resolution inverse synthetic aperture radar (ISAR) imaging of satellites can provide an in-situ assessment of ...
Simon Anger +3 more
doaj +1 more source
Delay-Modulated RF Tag System Concept Using Ultrawideband Noise Radar Waveforms
International Journal of Distributed Sensor Networks, 2011 Radio frequency (RF) tags have been widely used in inventory tracking, environmental monitoring, battlefield situational awareness, and combat identification due to their low cost, small size, and wireless functionality.
Qihe Pan, Ram M. Narayanan
doaj +1 more source
Data analysis techniques: Spectral processing [PDF]
, 1983 The individual steps in the data processing scheme applied to most radars used for wind sounding are analyzed. This processing method uses spectral analysis and assumes a pulse Doppler radar.
Strauch, R. G.
core +1 more source
Recent Progress on Flexible Multimodal Sensors: Decoupling Strategies, Fabrication and Applications
Advanced Materials, EarlyView.In this review, we establish a tripartite decoupling framework for flexible multimodal sensors, which elucidates the underlying principles of signal crosstalk and their solutions through material design, structural engineering, and AI algorithms. We also demonstrate its potential applications across environmental monitoring, health monitoring, human ...
Tao Wu +10 more
wiley +1 more source
IEEE AccessWe demonstrate an imageless method of concealed contraband detection using a real-time 75 GHz rotationally dynamic antenna array. The array measures information in the two-dimensional Fourier domain and captures a set of samples that is sufficient for ...
Daniel Chen +2 more
doaj +1 more source
Analogue RF over fibre links for future radar systems [PDF]
, 2017 The distribution of analogue RF signals within a high performance radar system is challenging due to the limited space available and the high levels of performance required.
Kelly, A.E., Raphael, N., Thow, T.
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Advanced Materials Technologies, EarlyView.An LCD‐compatible complementary liquid‐crystal metasurface delivers dual‐band, dual‐polarized Ka‐band wavefront control with millisecond switching via a 10‐µm LC gap. Interlaced patch/slot pairs enable independent phase tuning at 28 and 38 GHz, while strategic 45° slot rotation suppresses parasitic resonances. Measurements on a 160 × 160‐cell prototype
Daehyeon Kim +4 more
wiley +1 more source