Results 341 to 350 of about 1,829,864 (373)

Design of an Active Beam-Steering Array With a Perforated Wide-Angle Impedance Matching Layer

IEEE Transactions on Antennas and Propagation, 2021
In this communication, a tapered slot antenna array with a perforated wide-angle impedance matching (WAIM) layer is studied for active beam steering.
Juho Yun, Daesung Park, Donghyuk Jang, K. Hwang   +3 more
semanticscholar   +1 more source

Beam-steering antennas at millimeter wavelengths

Proceedings of 2012 5th Global Symposium on Millimeter-Waves, 2012
In 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.
Räisänen, Antti, Ala-Laurinaho, Juha, Chicherin, Dmitry, Du, Z., Generalov, A., Karttunen, A., Lioubtchenko, D., Mallat, J., Tamminen, A., Zvolensky, T.   +9 more
openaire   +2 more sources

Actively Switchable Beam‐Steering via Hydrophilic/Hydrophobic‐Selective Design of Water‐Immersed Metasurface

Advanced Optical Materials, 2021
Liquid immersion on metasurface was earlier demonstrated to realize spectral control. However, it remains a great challenge to achieve tunable phase modulation and versatile beam‐steering performance, which are critical for practical optoelectronic ...
Zhe Li, Chengwei Wan, Chenjie Dai, Jian Zhang, Guoxing Zheng, Zhong-zhi Li   +5 more
semanticscholar   +1 more source

Graphene-based Beam Steering Antenna

2020 IEEE 3rd International Conference on Electronic Information and Communication Technology (ICEICT), 2020
In this paper, two kinds of graphene-based beam steering millimeter wave antennas presented by our group are summarized. Firstly, a pattern reconfigurable antenna is presented, which is composed of two improved Vivaldi antennas distributed inversely and a power dividing feed line loaded with graphene nanoplates.
Junfeng Li, Bian Wu, Chi Fan
openaire   +1 more source

Circularly Polarized 2 Bit Reconfigurable Beam-Steering Antenna Array

IEEE Transactions on Antennas and Propagation, 2020
In this communication, a circularly polarized (CP) reconfigurable 2 bit antenna array is proposed for beam-steering applications. The proposed antenna array utilizes a novel CP reconfigurable 2 bit patch antenna as radiation element. For a reconfigurable
Peiqin Liu, Yue Li, Zhijun Zhang
semanticscholar   +1 more source

Electronic beam steering of shock waves

Ultrasound in Medicine & Biology, 1995
Shock-wave generators are now currently used for the treatment of renal stones. In all these generators the focal zone is determined by their geometrical parameters. We propose, for the first time, a piezocomposite shock-wave generator with electronic focusing. The system is composed of a two-dimensional array and its electronic hardware.
D, Cathignol, A, Birer, S, Nachef, J Y, Chapelon   +3 more
openaire   +2 more sources

Agile Nonmechanical Beam Steering

Optics and Photonics News, 2006
The day is coming when engineers will be able to replace mechanical complex gimbal and steering mirror assemblies in electro-optical systems with thin, conformal devices that either have no moving parts or only make use of micro-motion.
openaire   +1 more source

Wideband plasmonic beam steering in metal gratings

Optics Letters, 2012
We demonstrate controllable light deflection in thick metal gratings with periodic subwavelength slits filled with an active material. Under specific illumination conditions, the grating becomes nearly transparent and acts as a uniform optical phased-array antenna where the phase of the radiating elements is controlled by modifying the index of ...
DE CEGLIA, DOMENICO, VINCENTI, MARIA ANTONIETTA, Scalora, M.   +2 more
openaire   +3 more sources

Frequency–angular resolving LiDAR using chip-scale acousto-optic beam steering

Conference on Lasers and Electro-Optics, 2023
Bingzhao Li, Qixuan Lin, Mo Li
semanticscholar   +1 more source

Hydrophone guided transcranial beam steering

The Journal of the Acoustical Society of America, 2001
A new method for focusing ultrasound energy in brain tissue through the skull bone is investigated. The procedure is designed for use with a multielement therapeutic transducer array and a small catheter-inserted hydrophone receiver placed in the brain in order to guide the array’s focus over a volume of tissue about the receiver.
Greg Clement, Kullervo Hynynen
openaire   +1 more source