Results 21 to 30 of about 1,746,770 (313)
Active Antennas Beyond the Standard Impedance Matching Technique: Concepts and Applications
IEEE Open Journal of Antennas and PropagationThis paper presents a new design concept for improving active antennas’ performances beyond the standard impedance matching technique. The proposed approach expands the mismatch at the antenna-amplifier interface to create a voltage excess ...
Constant M. A. Niamien
doaj +1 more source
Serial Patch Array Antenna for an FMCW Radar Housed in a White Cane
International Journal of Antennas and Propagation, 2016 The design, realization, and test of the transmitting and receiving antennas for an FMCW radar operating between 24 and 24.25 GHz (ISM band), to be housed in a white cane for improving mobility of visually impaired subjects, have been performed.
Stefano Pisa +2 more
doaj +1 more source
Research of independent DC electric field sensor with wireless power supply circuit
The Journal of Engineering, 2019 The DC electric field strength is an important electromagnetic environment parameter of the high-voltage direct current (HVDC) transmission line. Measurement results of the space electric field are dramatically affected by the size and the potential of ...
Jianzhong When +5 more
doaj +1 more source
IEEE Access, 2020 In cylindrical multilayered medium, we develop two tool models for electromagnetic (EM) well logging: a metal mandrel winding with a co-axial (tilted) transmitter coil and a tilted (coaxial) receiver coil.
Yan Bai +5 more
doaj +1 more source
Simulation-based configurations study of active millimetre-wave imaging system for personal security
The Journal of Engineering, 2019 Active millimetre-wave (mm-wave) imaging techniques and systems have been widely investigated and developed, due to their ability to detect personal carried concealed weapons and other contraband, at airports and other secure locations.
Yan You, LingBo Qiao, ZiRan Zhao
doaj +1 more source
Simulation of interaction of antennas in the near zone
Вісник Харківського національногоуніверситету імені В.Н. Каразіна. Серія: Радіофізика та електронікаRelevance. Obtaining the minimization or maximization of the interaction between the radiating and receiving antennas (or the receiving antenna with fields reflected from some obstacle) due to the orientation and location of the antennas at a certain ...
М. Legenkiy, V. Khrychov
doaj +1 more source
Analysis of RF Front-End Performance of Reconfigurable Antennas with RF Switches in the Far Field
International Journal of Antennas and Propagation, 2014 The RF front-end performances in the far-field condition of reconfigurable antennas employing two commonly used RF switching devices (PIN diodes and RF-MEMS switches) were compared.
Insu Yeom +4 more
doaj +1 more source
IEEE Open Journal of Antennas and Propagation, 2023 In classical antenna theory, the Thévenin equivalent circuit is a commonly used tool to analyze the characteristics of receiving antennas. However, when dealing with a lossy antenna that is near a large load impedance, this circuit has limitations
Junming Diao, Lu Liu
doaj +1 more source
Analysis of a distributed MIMO channel capacity under a special scenario
EURASIP Journal on Wireless Communications and Networking, 2019 A distributed antenna system enhances the coverage performance of a system by distributing the antennas geographically, as well as by improving the diversity gain and capacity performance.
Xiaonan Zhao +5 more
doaj +1 more source
Pediatric Blood &Cancer, EarlyView.ABSTRACT Asymptomatic infection poses a significant risk for children undergoing hematopoietic stem cell transplantation (HSCT). Pre‐transplant surveillance computed tomography (CT) is commonly used to identify occult infection, though its diagnostic yield remains uncertain.
Tyler Obermark +9 more
wiley +1 more source