Results 21 to 30 of about 984,557 (317)
Multilevel modulated signal transmission over serial single-mode and multimode fiber links using vertical-cavity surface-emitting lasers for millimeter-wave wireless communications [PDF]
, 2007 Quadrature phase-shift keying, 16 quadrature amplitude modulation (QAM), and 64-QAM data transmission-Worldwide Interoperability for Microwave Access modulation schemes-at 6 and 20 MS/s is demonstrated for a link that emulates a cost-effective 1.55-m ...
Shen, Pengbo +3 more
core +1 more source
User Impact on Phased and Switch Diversity Arrays in 5G Mobile Terminals
IEEE Access, 2018 In this paper, a mobile terminal phased array at 28 GHz with different scan angles is compared with a switch diversity antenna array at 28 GHz in the case of antenna beams pointing at the user's body.
Igor Syrytsin +2 more
doaj +1 more source
Millimeter-wave detection of landmines
SPIE Proceedings, 2013 Millimeter wave absorption relative to background soil can be used for detection landmines with little or no metal content. At these frequencies, soil and landmine absorb electromagnetic energy differently. Stepped frequency measurements from 20 GHz to 60 GHz were used to detect buried surrogate landmines in the soil.
Ozturk, Hilmi +6 more
openaire +3 more sources
Automatic detection of hidden threats in the TeraSCREEN passive millimeter-wave imaging subsystem
, 2022 Paper 94620J, 7 S.Passive millimeter-wave imaging systems can play a significant role in security applications. Especially, the detection of hidden threats for border security is a growing field.
Madhogaria, S., Schikora, M.
core +1 more source
A Non-Linear Correction Method for Terahertz LFMCW Radar
IEEE Access, 2020 The nonlinearity in terahertz (THz) linear frequency modulated continuous wave (LFMCW) radar usually blurs the range profile and decreases the signal to noise ratio, hampering applications where high range-resolution is particularly emphasized.
Yade Li +5 more
doaj +1 more source
Wide-Band and Wide-Angle Scanning Phased Array Antenna for Mobile Communication System
IEEE Open Journal of Antennas and Propagation, 2021 A wide-band phased array antenna with wide-angle scanning capability for mobile communication system is proposed in this article. An air cavity is properly embedded into the substrate under each array element.
Guangwei Yang, Yiming Zhang, Shuai Zhang
doaj +1 more source
Nonlinearity and Noise Effects in Multi-level Signal Millimeter-Wave over Fiber Transmission using Single- and Dual-Wavelength Modulation [PDF]
, 2010 We transmit multilevel quadrature amplitude modulation (QAM) data-IEEE 802.16 schemes-at 20 MSps and an orthogonal frequency-division multiplexing (OFDM) 802.11 g signal (54 Mbps) with a 25 GHz millimeter-wave over fiber system, which employs a dual ...
Jeanne James +9 more
core +1 more source
Leida xuebao, 2018 Two important issues must be considered when modeling the terahertz (THz) wave scattering behavior using microwave EM methods. The first is the material response characteristics, including the metallic materials that may be beyond the scope of the Drude ...
Chen Hui +4 more
doaj +1 more source
Frontiers in Materials, 2022 Reconfigurable intelligent surfaces (RISs) have attracted extensive attention in recent years due to their strong ability to improve and customize electromagnetic wave propagation channels in wireless communications.
Jing Cheng Liang +4 more
doaj +1 more source
Cylindrical Three-Dimensional Millimeter-Wave Imaging via Compressive Sensing
International Journal of Antennas and Propagation, 2015 Millimeter-wave (MMW) imaging techniques have been used for the detection of concealed weapons and contraband carried by personnel. However, the future application of the new technology may be limited by its large number of antennas.
Guoqiang Zhao +4 more
doaj +1 more source