Results 21 to 30 of about 549,184 (227)

Assessing the Intrinsic Radiation Efficiency of Tissue-Implanted UHF Antennas

IEEE Transactions on Antennas and Propagation, 2020
Dielectric loss occurring in tissues in close proximity to UHF-implanted antennas is an important factor in the performance of medical implant communication systems. Common practice in numerical analysis and testing is to utilize radiation efficiency (RE)
Yomna El-Saboni, D. Zelenchuk, G. Conway, W. Scanlon   +3 more
semanticscholar   +1 more source

Detection, Classification and Location of Sources of Partial Discharges Using the Radiometric Method: Trends, Challenges and Open Issues

IEEE Access, 2021
In this article, it is provided a comprehensive survey on the most relevant research in the area of detection, classification and location of partial discharge (PD) sources using the radiometric or ultra high frequency (UHF) method, focusing mainly on ...
George V. R. Xavier, Hugerles S. Silva, Edson G. da Costa, Alexandre J. R. Serres, Nuno B. Carvalho, Arnaldo S. R. Oliveira   +5 more
doaj   +1 more source

UHF RECTENNA USING A BOWTIE ANTENNA [PDF]

Progress In Electromagnetics Research C, 2012
In this paper, a rectifying antenna (rectenna) for energy scavenging applications is presented. The proposed device uses a modifled bowtie antenna to collect the electromagnetic energy coming from UHF RFID systems, and RF Schottky diodes to convert it into DC power.
Monti G., Congedo F.
openaire   +1 more source

Investigating the Capability of PD-Type Recognition Based on UHF Signals Recorded with Different Antennas Using Supervised Machine Learning

Energies, 2022
The article presents research on the influence of the type of UHF antenna and the type of machine learning algorithm on the effectiveness of classification of partial discharges (PD) occurring in the insulation system of a power transformer.
Daria Wotzka, Wojciech Sikorski, Cyprian Szymczak   +2 more
doaj   +1 more source

A new technique for separation of partial discharge sources and electromagnetic noise in radiofrequency measurements using energy ratios of different antennas

High Voltage, 2021
One of the main tools for monitoring the condition of high voltage equipment is the measurement of partial discharges (PD). The electromagnetic (EM) radiation originated from this degradation phenomenon can be captured by various types of ultra‐high ...
Jorge A. Ardila‐Rey, Matias Cerda‐Luna, Rodrigo Rozas‐Valderrama, Bruno Albuquerque de Castro, André Luiz Andreoli, Benjamin Cevallos   +5 more
doaj   +1 more source

Rancang Bangun Multi Frekuensi Rectenna Untuk Energy Harvesting Gelombang Elektromagnetik

Protek: Jurnal Ilmiah Teknik Elektro, 2021
The increasing need for electrical energy encourages the birth of methods to utilize various forms of energy available in nature called energy harvestin. One of them is from electromagnetic waves that are massif used daily by the community. In this study,
Sukriyah Buwarda, Asmawaty Azis
doaj   +1 more source

Gain Enhancement of a Microstrip Patch Antenna with Quasi H-Shaped Slot for UHF RFID Reader

Journal of Applied Science and Engineering, 2022
This paper aims to enhance the gain of a microstrip patch antenna for ultra-high frequency (UHF) radio frequency identification (RFID) reader. The paper proposes a new antenna design that consists of a perfectconductor rectangular patch with a quasi H ...
Mousaab M. Nahas
doaj   +1 more source

Performance analysis of patch-type UHF-RFID tag antennas in the presence of mutual coupling

Advanced Electromagnetics
In a context of high-density deployment of UHF RFID patch-type tag antennas, mutual coupling can have an impact on the detection rate due to the degradation of the link budget between certain tags and the reader.
K. F. Gbamélé
doaj   +3 more sources

IoT-Linked Integrated NFC and Dual Band UHF/2.45 GHz RFID Reader Antenna Scheme

IEEE Access, 2019
This research proposes a system board of integrated antenna scheme of near-field communication (NFC) and dual band ultra-high frequency (UHF, 920-925 MHz)/2.45 GHz radio frequency identification (RFID) reader antennas for Internet of Things (IoT ...
Adisak Romputtal, Chuwong Phongcharoenpanich   +1 more
doaj   +1 more source

Illustration of the Impedance Behaviour of Extremely Low-Profile Coupled Shorted-Patches Antennas for UHF RFID of People

International Journal of Antennas and Propagation, 2014
The recently introduced coupled shorted-patches technique for the design of extremely low-profile UHF RFID tag antennas is used to illustrate the flexibility of selected feeding methods for tuning the antenna input impedance for the complex values ...
Milan Svanda, Milan Polivka
doaj   +1 more source