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A simple tuning technique is proposed to regulate the input impedance of resistive antennas over ultra-wide bandwidth. The proposed tuning technique involves adding extra copper pattern near the antenna drive point. It was shown to affect the input impedances of a resistive dipole and a 12-arm resistive cross dipole over ultra-wide bandwidth. The technique was applied to the 12-arm resistive cross...
The concentrated winding is the common winding method used in the conventional permanent magnet flux reversal machines (FRPM). In this paper a distributed winding for FRPM as a generator is proposed. To investigate the advantages of the proposed machine a comparative analysis of both the distributed and the concentrated winding for FRPM is performed. The output voltage waveforms of both machines are...
Remote line power is rapidly becoming an acceptable alternative to local power as a means of powering Fiber-to-the-Home (FTTH), DSLAMs, G.fast, and Small Cells. This paper gives examples of existing and emerging applications for remote line powering and describes the development and consolidation of standards that support it. The RFT-V standard, predominantly a North American standard, is now being...
Since the year 2000, the up to 400 Volt Direct Current (400VDC) powering interface for Telecom and Datacenters equipment has been standardized and industrialized as it brings advantages. Compared to 48 Volt Direct Current power solutions, it uses much less copper and the energy losses in cable are lower. Compared to Alternating Current uninterrupted power supply (UPS) benefits are simplicity higher...
The main problems with plasmonics for devices are connected with its very nature implying the need to use free electron conductors, mostly good metals like silver or gold. The choice of natural materials and thus their operating ranges, as defined by their plasma frequency, is rather limited. Also, absorption losses in good conductors are quite high. Because of that alternative plasmonic materials...
The actual way of living is characterized by a large use of connected terminals and devices. This connectivity needs permanent intercommunication between terminals and requires miniaturization, power management, and intelligence. In this context, Human Body Communication (HBC) is an emerging and promising communication technique of Body Area Network (BAN) which enshrines these requirements. HBC is...
A two-dimensional (2D) rotary axisymmetric model has been developed to describe the formation and development of cathode spot in vacuum arc. The model includes hydrodynamic equations and thermal conductivity equation. Parameters used in this model come from experiments and other researchers' work. The simulation results show that when the energy flux density is 1.5∼3×1012W, discharge current is 1∼6A...
To fulfill the promises of wide band-gap (WBG) power transistors, circuit parasitics arising from the interconnection of these devices must be reduced through careful layout. While prior work has demonstrated guidelines for lateral, single-sided PCB layouts for half-bridges, this work presents the potential improvement in vertical, dual-sided designs by leveraging an electrically thin approach. Though...
Nowadays, Rate-Distortion Optimization (RDO) is commonly used in hybrid video coding to maximize coding efficiency. Usually, the rate distortion tradeoff is explicitly computed in offline encoder implementations whereas R(D) model are used in live encoders to select the best decisions at a lower computational cost. For sake of simplicity, this (mathematical) modelling is often performed for each coding...
One of the biggest challenges faced in the characterization of wide-band gap (WBG) semiconductors is the accurate measurement of the current through the device. Most measuring techniques available do not have the necessary bandwidth to capture the high-frequency current content in such systems. Many of the solutions that do have the necessary bandwidth introduce a “choke-point” into the system by...
An improved SiC MOSFET-gate driver integrated half-bridge module with folded layout using direct bonded copper (DBC) substrate is designed, fabricated, and tested. The bottom layer of the DBC is used as part of the power loop to achieve major reduction in the loop stray inductance. Due to the low parasitic inductance and capacitance, the gate resistor is chosen as zero to reduce the switching loss...
We propose a frequency-reusable architecture for fiber-extend copper lines with spectrally efficient multiple copper line monitoring. In-service simultaneous multi-copper and fiber monitoring is possible with the right choice of frequency bands, a result backed by the Error Vector Magnitude measurement of data channels in simultaneous coexistence with monitoring channels. The proposed monitoring method...
Side reservoir can improve electromigration (EM) lifetime of copper interconnects. In this work, finite element method (FEM) simulations for interconnect structures with cathode end-of-line reservoir and side reservoir respectively have been conducted to study the side reservoir effects on EM lifetime. It is demonstrated that side location is most likely to have void failure and side reservoir can...
This paper investigates the influence of geometric design variables on the machine's characteristics of low voltage permanent magnet synchronous motor for in-wheel direct-drive application. On the base of finite-element-analysis, sensitivity analysis has be performed to improve the torque density and the efficiency. The effect of different slot/pole combinations on the machine's characteristics has...
This work deals with the design of a Lightning Protection System to the rocket launcher located in the Barreira do Inferno Launch Center. For its development the technical standards ABNT NBR 5419/2015 and IEC 62305 were used as main references. The Electrogeometrical Method (Rolling Spheres) was used for the development of the project, chosen after a thorough analysis of the other methods and the...
Interior permanent magnet synchronous machine (IPMSM) has been widely used in traction application due to high efficiency and high power density. Nowadays, in electric vehicle application, the average efficiency over a driving cycle (AEDC) is more attractive than the efficiency over single working point. The paper deals with the design optimization of the average efficiency over a given driving cycle...
DC-DC converters with wide-bandgap semiconductors facilitate the operation at higher switching frequencies. Thus, inductors can be reduced in size which is beneficial in regard to power density and weight of the converter. As a drawback, high frequency inductors suffer from considerably large winding losses caused by skin and proximity effects. Litz wire is a possible solution but it results in a...
This paper deals with fault tolerant control of a sinusoidal EMF five-phase permanent-magnet synchronous generator (PMSG) connected to an AC-DC converter without neutral connection. Under one open phase condition, the proposed global method is based on an original approach optimization problem minimizing copper losses and cancelling torque ripples. The used optimization algorithm is based to a Particle...
TiO2-nanoparticles under UV-light irradiation are well known for photocatalytic activities due to generated electron/hole pairs. This is investigated for widespread applications like water splitting for fuel generation, wetting of surfaces, photovoltaics or destruction of germs and bacteria on contaminated surfaces. TiO2 nanoparticles combined with copper and palladium nanoparticles show selective...
Agriculture and food constitute a hugely significant element of the Irish economy in terms of jobs and exports, and its long-term competitiveness and sustainability is a priority concern of national policy. The continuous development and application of new knowledge and new technologies is crucial to the realisation of national policy objectives for the sector. Nanotechnology has emerged as a technological...
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