Results 301 to 310 of about 96,151 (324)
Some of the next articles are maybe not open access.
Beam steering with a metasurface
Science, 2019Metasurfaces Metasurfaces have been designed that function as many passive optical elements. Shaltout et al. created a time-dependent active element. A frequency-comb light beam (a light source consisting of a broad range of evenly spaced wavelengths) interacted with a specially designed passive metasurface so that the beam could be rapidly (
openaire +2 more sources
Metamaterial lens for beam steering
2016 10th European Conference on Antennas and Propagation (EuCAP), 2016A metamaterial-based lens, calculated using transformation optics concept, is designed using electric-LC resonators. A planar microstrip antenna source is used as transverse electric polarized wave launcher for the lens. Both the far field radiation patterns and the near-field distributions have been measured to experimentally demonstrate the beam ...
Shah Nawaz Burokur +2 more
openaire +2 more sources
Beam steering in waveguide arrays
Applied Physics Letters, 2002We demonstrate that highly efficient beam steering and switching can be achieved in thermo-optic waveguide arrays. For a given initial excitation, we find the position of the output field to depend on the transverse temperature gradient. By changing this gradient, we manage to steer the beam across the entire array.
Andreas Bräuer +4 more
openaire +2 more sources
Steering of directional sound beams
The Journal of the Acoustical Society of America, 2007Apparatus is disclosed for steering a directional audio beam that is self-demodulated from an ultrasound carrier. The apparatus includes means for modulating a carrier signal with an audio signal and means for adjusting the amplitude and phase of at least one of the audio signal and/or the carrier signal to steer the audio beam to a desired direction ...
Yi Wang +8 more
openaire +2 more sources
Phase shifter for antenna beam steering
AIP Conference Proceedings, 2016Wide band Array Antenna operates in Ku-band (10.7-12.7 GHz) frequency composed of N×N radiating elements. This antenna aims at the reception of television satellite signals. The goal of this research is to provide better possibility of electronic beam control instead of manual or mechanical control, and design compact and low cost phase shifters to be ...
Jindal, R., Razban, T.
openaire +2 more sources
Dynamic Beam Steering With Reconfigurable Metagratings
IEEE Transactions on Antennas and Propagation, 2020Metagratings have recently shown promising features for wavefront manipulation, overcoming the efficiency limitations of gradient metasurfaces and their demanding fabrication requirements. Extreme functionalities, such as perfect anomalous reflection and refraction, focusing, and holography, have been proposed and tested. However, most of the developed
Andrea Casolaro +3 more
openaire +3 more sources
Beam-steering antennas at millimeter wavelengths
Proceedings of 2012 5th Global Symposium on Millimeter-Waves, 2012In many emerging applications of millimeter waves, electronic focusing and beam steering is needed. We present a survey of mm-wave beam steering antennas, where the necessary phase change for antenna elements is achieved using various electronically tuneable elements, e.g.
Aleksi Tamminen +9 more
openaire +3 more sources
Heterodyne Imaging and Beam Steering [PDF]
, 2009 Heterodyne receiver coherently transfers the phase of optical wave into the phase of radio signal. This feature is essential for holography and adaptive optics – the fields where phase information is of primary importance. In addition, high sensitivity of the heterodyne receiver together with high angular resolution of optical systems determine such an
openaire +1 more source
Advanced beam steering in helical drilling
International Congress on Applications of Lasers & Electro-Optics, 2009Helical laser drilling is a method for producing high quality holes with defined geometries in different materials among industries such as aerospace, medical device manufacturing and electronics. If the aspect ratio of the hole is small, drilling can be done using a fast scanner.
Petri Laakso +5 more
openaire +3 more sources
Compound Scanning with an Electrically Steered Beam
Ultrasonic Imaging, 1981Compound scanning using electronic steering of an array of transducers makes it possible to widen the area being explored and to increase the amount of information contained in an ultrasonic image. The principle and the operating characteristics of the method are described and its effectiveness demonstrated by in vitro and in vivo experiments ...
Léandre Pourcelot, A. Roncin, M. Berson
openaire +2 more sources