Improved thresholding and quantization techniques for image compression [PDF]
, 2017 In recent decades, digital images have become increasingly important. With many modern applications use image graphics extensively, it tends to burden both the storage and transmission process.
Dr. Muhammad Masruri, Dr. Muhammad Masruri +5 more
core +1 more source
Recent Developments of Reflectarray Antennas in Dual-Reflector Configurations
International Journal of Antennas and Propagation, 2012 Recent work on dual-reflector antennas involving reflectarrays is reviewed in this paper. Both dual-reflector antenna with a reflectarray subreflector and dual-reflectarrays antennas with flat or parabolic main reflectarray are considered.
Carolina Tienda +2 more
doaj +1 more source
Real-time power system dynamic security assessment based on advanced feature selection for decision tree classifiers [PDF]
, 2017 This paper proposed a novel algorithm based on advanced feature selection technique for decision tree (DT) classifier to assess the dynamic security in power system.
Al-Gubri, Qusay, Mohd Ariff, Mohd Aifaa
core +1 more source
Dual-Polarization Ku-Band Compact Spaceborne Antenna Based on Dual-Reflectarray Optics
Sensors, 2018 This article demonstrated an accurate analysis technique for dual-reflectarray antennas that take into account the angle of incidence of the impinging electric field on the main reflectarray cells. The reflected field on the sub and the main reflectarray
Carolina Tienda +3 more
doaj +1 more source
A Review on the Development of Spaceborne Membrane Antennas
Space: Science & Technology, 2022 The membrane antenna technology is a very promising approach to obtain large aperture with light weight and low stowed volume. In the past decades, extensive studies have been carried out on active and passive membrane antennas.
Ming-Jian Li +4 more
doaj +1 more source
Reflectarray antennas for space applications [PDF]
2012 IEEE International Conference on Ultra-Wideband, 2012 In this paper, the advantages and recent developments of reflectarray antennas for space applications are reviewed. Basic requirements for space antennas, and the limitations and challenges of conventional designs are discussed. Various advantages of reflectarray antennas over reflectors and phased array antennas are reviewed and it is shown that ...
Atef Z. Elsherbeni +2 more
openaire +1 more source
Implementation of an Innovative Method to Design Reflectarray Antennas
International Journal of Antennas and Propagation, 2012 A novel computed aided technique for designing reflectarray antennas is presented. The developed approach automatically generates the geometrical model of reflectarray antennas taking into account some input parameters, such as, the unit cell type and ...
Abdelhamid Tayebi +3 more
doaj +1 more source
Hardware-Efficient Hybrid Precoding for Millimeter Wave Systems With Multi-Feed Reflectarrays
IEEE Access, 2018 Current hybrid precoding schemes for large-scale antenna array-aided millimeter wave (mmWave) wireless systems adopt either full-connected or sub-connected architectures based on phased array antennas (PAAs).
Zhengyi Zhou +3 more
doaj +1 more source
High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays [PDF]
, 2016 A limiting factor in the development of mid-infrared optics is the lack of abundant materials that are transparent, low cost, lightweight, and easy to machine. In this paper, we demonstrate a metasurface device that circumvents these limitations.
Aieta, Francesco +11 more
core +3 more sources
Bandwidth Behavior of Closely Spaced Aperture-Coupled Reflectarrays
International Journal of Antennas and Propagation, 2012 The bandwidth features of reflectarray antennas are analyzed by examining in detail the phase errors due to the compensation mechanism for spatial phase delays.
F. Venneri, S. Costanzo, G. Di Massa
doaj +1 more source