Results 11 to 20 of about 549,184 (227)

Upper-Bound Electromagnetic Performance of Substrate-Free Epidermal Tattoo Antennas for UHF Applications [PDF]

Sensors
Substrate-free epidermal antennas promise imperceptible and long-term wearable sensing, yet their electromagnetic performance is fundamentally constrained by the properties of ultrathin conductors.
Adina Bianca Barba, Alessio Mostaccio, Rasha Ahmed Hanafy Bayomi, Sunghoon Lee, Gaetano Marrocco, Takao Someya, Cecilia Occhiuzzi   +6 more
doaj   +2 more sources

Transceiver 16-Channel Coaxial-End Dipole Array for Combined Head and C-Spine MRI at 9.4 T. [PDF]

NMR Biomed
A double‐row transceiver array consisting of 16 folded‐end coaxial‐end dipoles was designed. Curved dipole elements were aligned on a tight‐fitting, ergonomically shaped holder optimized for subject comfort. Transmit efficiency, B1+ field homogeneity, and SAR were numerically evaluated using EM‐simulations and optimized with respect to several ...
Solomakha GA, Glang F, May MW, Mueller S, Walzog J, Aghaeifar A, Bosch D, Bause J, Kraff O, Scheffler K, Quick HH, Avdievich NI.   +11 more
europepmc   +2 more sources

Optimisation of UHF antennas

Electronics Letters, 1990
The optimisation of a dipole fed reflector antenna is presented. The shape of the reflector and the dipole is varied in order to obtain a constant radiation pattern within a frequency range of nearly one octave.
K.E. Stocker, F.M. Landstorfer
openaire   +2 more sources

Compact UHF/VHF Monopole Antennas for CubeSats Applications

IEEE Access, 2020
In this paper, two compact monopole antennas working at 149 MHz (VHF) and 398 MHz (UHF) are proposed for CubeSats applications. Two monopole antennas are integrated on a double layer ceramic substrate. The overall dimensions of the folded antenna are 101
Xiang Zhang, Fu Sun, Guoxuan Zhang, Liming Hou   +3 more
doaj   +2 more sources

Conformal and Flexible Antennas in Ultra-High Frequencies: Prospects and Challenges for Partial Discharge Diagnostics

IEEE Access
With the exponential increase in smart device usage across various domains, flexible and conformal antenna technologies have emerged as transformative solutions, enabling wireless systems in numerous smart applications.
M. A. Taher, Mohamadariff Othman, Hazlee Azil Illias, Tarik Abdul Latef, Tengku Faiz Tengku Mohmed Noor Izam, S. M. Kayser Azam, Muhammad Ubaid Ullah, Mohamed Alkhatib, Mousa I. Hussein   +8 more
doaj   +2 more sources

Study on Miniaturized UHF Antennas for Partial Discharge Detection in High-Voltage Electrical Equipment. [PDF]

Sensors (Basel), 2015
Detecting partial discharge (PD) is an effective way to evaluate the condition of high-voltage electrical equipment insulation. The UHF detection method has attracted attention due to its high sensitivity, strong interference resistance, and ability to ...
Liu J, Zhang G, Dong J, Wang J.
europepmc   +2 more sources

Ultra-high frequency printable antennas for partial discharge diagnostics in high voltage equipment

Alexandria Engineering Journal, 2023
In this article, we have performed a comprehensive investigation in the specialty of ultra-high frequency (UHF) printable antennas for partial discharge (PD) diagnostics.
S. M. Kayser Azam, Mohamadariff Othman, Hazlee Azil Illias, Tarik Abdul Latef, Mohammad Tariqul Islam, Mohd Fadzil Ain   +5 more
doaj   +1 more source

Transparent Liquid Multiple-Antenna Array with a High Gain and Beam Diversity for UHD TV Applications [PDF]

Journal of Electromagnetic Engineering and Science, 2022
The design of television (TV) antennas for commercial use that operate on the ultra-high frequency (UHF) band has become more challenging given the relatively large size of these antennas and considering that they typically do not conform to ...
Duy Tung Phan, Chang Won Jung
doaj   +1 more source

Design of Bowtie Antenna With Rounded Edge and Middle-Sliced Modifications for UHF Partial Discharge Sensor

IEEE Access, 2023
Partial Discharge (PD) detection using ultra-high frequency (UHF) method has been proven as more noise-resistant in GIS condition monitoring, compared to the conventional PD detection methods, where the common noise frequency range such as in the power ...
Umar Khayam, Asep Andi Suryandi, Rachmawati   +2 more
doaj   +1 more source

“Unconventionally Shaped” Antenna Design for UHF RFID Tags

International Journal of Antennas and Propagation, 2021
UHF RFID tags need to be attached or embedded into various objects. Unlike traditional free-standing antennas, UHF antenna shapes and form factors may vary significantly.
Silong Wang, Yulong Liu, Terry Tao Ye
doaj   +1 more source