Results 21 to 30 of about 632 (194)
Optimization of Wireless Communication Coverage in Underground Tunnels Based on Zone Division
International Journal of Antennas and Propagation, 2020 In order to reduce the path loss of the wireless communication signal in the underground tunnel, a scheme for configuring the antenna polarization of wireless systems based on a zone-division method is proposed.
Yu Huo +6 more
doaj +1 more source
Charging Mobile Devices in Indoor Environments
Energies, 2022 Wireless power transfer promises to revolutionize the way in which we use and power mobile devices. However, low transfer efficiencies prevent this technology from seeing wide scale real-world adoption.
Diogo Matos +6 more
doaj +1 more source
Information and Telecommunication Sciences, 2017 Background. Modern methods for determining the position of the source of radio emission in the Fresnel zone from the sphericity of the electromagnetic wave front received by the linear antenna array allow solving the problem of simultaneous determination
Evgeniy Yakornov, Oleg Tsukanov
doaj +1 more source
International Journal of Antennas and Propagation, 2008 This paper presented a theoretical and numerical assessment for nonidentical segmented exponential- (NISE-) convex and NISE-concave serrated plane CATRs by changing number of serrations.
T. Venkata Rama Krishna +2 more
doaj +1 more source
GPS Multipath Analysis Using Fresnel Zones
Sensors, 2018 GNSS (Global Navigation Satellite Systems) multipath has been subject to scientific research for decades and although numerous methods and techniques have already been developed to mitigate this effect, it is still one of the accuracy-limiting factors in
Florian Zimmermann +3 more
doaj +1 more source
Design of a Wireless Sensor Network for Optimal Deployment of Sensor Nodes in a Cocoa Crop
TecnoLógicas, 2020 In this study, factorial experiments were conducted in two different scenarios to design a Wireless Sensor Network for monitoring a cocoa crop in a rural area in Colombia.
Jose M. Celis-Peñaranda +5 more
doaj +1 more source
Geosciences, 2019 Asphalt pavement compaction quality control and quality assurance (QC/QA) are traditionally based on destructive drilled cores and/or nuclear gauge results, which both are spot measurements representing significantly less than 1 percent of the in-service
Kyle Hoegh +3 more
doaj +1 more source
Untangling the Incoherent and Coherent Scattering Components in GNSS-R and Novel Applications
Remote Sensing, 2020 As opposed to monostatic radars where incoherent backscattering dominates, in bistatic radars, such as Global Navigation Satellite Systems Reflectometry (GNSS-R), the forward scattered signals exhibit both an incoherent and a coherent component.
Joan Francesc Munoz-Martin +7 more
doaj +1 more source
Fresnel zones for ground-based antennas [PDF]
IEEE Transactions on Antennas and Propagation, 1964 The ordinary Fresnel zone concept is modified to include the influence of finite ground conductivity. This is important for ground-based antennas because the influence on the radiation pattern of irregularities near the antenna is determined by the amplitude and phase of the groundwave.
openaire +2 more sources
Wood zone plate fishnet metalens
EPJ Applied Metamaterials, 2015 Fresnel-zone plate lenses provide focusing performance while having low profile. Unfortunately, they usually display higher reflection losses than conventional dielectric lenses.
Orazbayev Bakhtiyar +2 more
doaj +1 more source