Results 31 to 40 of about 915 (151)
An Active VHF and UHF Electrically Small Horn Antenna Using Non-Foster Matching Circuit [PDF]
Iranian Journal of Electrical and Electronic Engineering, 2023 In this article, an active electrically small Horn antenna for very high frequency (VHF) and ultra-high frequency (UHF) frequencies is presented. The proposed horn antenna has a height of 5 cm and a diameter of 4.28 cm which can cover 6-12 GHz without a ...
Atefeh Sohrabi +2 more
doaj
PD Flexible Built-In High-Sensitivity Elliptical Monopole Antenna Sensor
Sensors, 2022 In view of the insufficient signal detection sensitivity of Gas Insulated Switchgear (GIS), partial discharge (PD), ultra-high frequency (UHF), and failure to conform with GIS surface structure when the existing rigid stereo structure UHF sensor is built
Hanting Zhang +6 more
doaj +1 more source
Nanomaterials, 2022 The concept of the nanosatellite comes into play in launching miniaturized versions of satellites or regarding payloads with minimizing cost and building time.
Touhidul Alam +7 more
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Coaxial Dipole Array With Switching Transmit Sensitivities for Ultrahigh Field MRI
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose To investigate dipole antennas with electronically switchable transmit field patterns to improve flip angle homogeneity in ultra‐high field MRI. Methods Reconfigurable dipole elements that could produce two distinct electronically switchable B1+$$ {B}_1^{+} $$ field profiles were conceptualized and constructed. Eight such elements were
Dario Bosch +5 more
wiley +1 more source
Octafilar Helical Antenna for Portable UHF-RFID Reader
International Journal of Engineering Business Management, 2012 Octafilar helical antenna (OFHA) is proposed for handheld ultra-high-frequency (UHF) radio frequency identification (RFID) reader. The investigated antenna configuration consists of OFHA placed on reader device in the presence of human hand model.
Saber H. Zainud-Deen +2 more
doaj +1 more source
Calibration‐Free GRAPE pTx Pulses for Homogeneous Spatial‐Selective Excitation at 7T
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose Extend the universal pulse GRAPE formalism to pulses with a defined spectral response, and apply the concept to spatial selection. Methods We added Bloch simulations at several frequencies for each voxel to the pulse calculation to create universal spectrally‐selective GRAPE pulses.
Daniel Löwen +6 more
wiley +1 more source
A Hybrid RF Coil for Whole‐Brain Imaging in Non‐Human Primates at 7 T
Magnetic Resonance in Medicine, EarlyView.ABSTRACT Purpose Ultra‐high field MRI (≥ 7 T) offers unprecedented potential for mapping non‐human primate (NHP) brain function. However, complex electromagnetic systems are required to meet the challenges of UHF imaging and the mechanical demands of awake NHP studies.
Elias Djaballah +5 more
wiley +1 more source
Flexible Radio-Frequency Identification (RFID) Tag Antenna for Sensor Applications
Sensors, 2018 In this paper, an inkjet-printed flexible Radio-Frequency Identification (RFID) tag antenna is proposed for an ultra-high frequency (UHF) sensor application.
Mohammad Tariqul Islam +3 more
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High Voltage, EarlyView.ABSTRACT The electromagnetic wave produced by a partial discharge (PD) covers a broad range of frequencies, from a few kHz to several 100 MHz. Because of the nonlinear response of the stator winding, each frequency component of the PD pulse experiences different levels of attenuation as it travels through the winding structure. Consequently, the choice
Arash Abyaz +2 more
wiley +1 more source
UHF RFID Conductive Fabric Tag Design Optimization
Sensors, 2021 This paper presents the design of a 920 MHz Ultra High Frequency (UHF) band radio frequency identification (RFID) conductive fabric tag antenna. The DC (Direct Current) resistance and impedance of the conductive fabric are measured by a DC multimeter and
Franck Kimetya Byondi, Youchung Chung
doaj +1 more source