Results 21 to 30 of about 102,163 (333)
An Invariant Dual-beam Snowflake Antenna for Future 5G Communications [PDF]
, 2018 A broadband snowflake antenna for future 5G and millimeter-wave communications is presented. The proposed antenna has a size of 8 × 5 mm 2 . The antenna consists of a central hexagon surrounded by a series of symmetrically placed smaller hexagons around ...
Abbasi, Qammer H. +3 more
core +1 more source
Dual-stage Codebook Based on Partial Kronecker Product in Massive MIMO System [PDF]
Jisuanji gongcheng, 2017 Aiming at the problem that the additional degrees of freedom in the vertical dimension cannot be fully utilized,a partial Kronecker product based dual-stage codebook is proposed.In the dual-stage codebook,the first stage determines a beam group and ...
LI Tian,SUN Shaohui,LI Hui
doaj +1 more source
IEEE Photonics Journal, 2011 We propose and study photonic generation of broadly tunable microwave signals utilizing a dual-beam optically injected semiconductor laser. By injecting a slave laser with two detuned master lasers at the stable locking states, microwave signals with ...
Yu-Shan Juan, Fan-Yi Lin
doaj +1 more source
Albedo heterogeneity on the surface of (1943) Anteros [PDF]
, 2009 We have investigated the effect of rotation on the polarization of scattered light for the near-Earth asteroid (1943) Anteros using the Dual Beam Imaging Polarimeter on the University of Hawaii's 2.2 m telescope.
Akimov +23 more
core +1 more source
Dual-beam optical profilometer
Conference on Lasers and Electro-Optics, 1982 The ability to measure surface profiles and determine the statistical properties of surfaces is important for many applications. Examples can be found in fields as diverse as magnetic storage and optical fabrication. In this paper, we will describe the development of a novel noncontact optical profilometer.
David Y. Lou, A. Martinez, D. Stanton
openaire +2 more sources
IEEE AccessThe requirements of low Earth orbit (LEO) satellite systems for high-precision and selective multiple coverage, have driven much interest and demand for millimeter-wave multibeam antennas.
Youngin Yoo +4 more
doaj +1 more source
工程科学学报, 2017 Electron irradiation and simultaneous pulsed-laser and electron dual-beam irradiation were performed using laser high voltage electronic microscopy (HVEM) at 500℃, and the void-denuded zone (VDZ) and radiation-induced segregation (RIS) near the random ...
YANG Su-bing, YANG Zhan-bing, WANG Hui
doaj +1 more source
Thermal Lensing Spectroscopy With Picosecond Pulse Trains and a New Dual Beam Configuration [PDF]
, 1982 In this communication, we wish to report on the use of synchronously mode-locked picosecond lasers in a pump-probe configuration for TL spectroscopy. The peak power for these picosecond lasers is very high and, of course, the fundamental of the dye laser
Perry, J. W. +2 more
core +1 more source
A Low-Profile Broadband Dual-Beam Folded Transmitarray Antenna
IEEE Open Journal of Antennas and PropagationA novel folded transmitarray (FTA) integrating anomalous reflection and spin-decoupled methods is proposed to simultaneously realize arbitrary low profile and independent dual-circularly polarized (CP) beam control.
Hui Wang +8 more
doaj +1 more source
Analysis of Seeing-Induced Polarization Cross-Talk and Modulation Scheme Performance
, 2012 We analyze the generation of polarization cross-talk in Stokes polarimeters by atmospheric seeing, and its effects on the noise statistics of spectropolarimetric measurements for both single-beam and dual-beam instruments.
Casini, Roberto +2 more
core +1 more source