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This paper presents a wide-band RF shunt capacitive switch reconfigurable by means of electrically triggered Vanadium Oxide (VO2) phase transition to build a true-time delay (TTD) phase shifter. The concept of VO2-based reconfigurable shunt switch has been explained and experimentally demonstrated by designing, fabricating and characterizing an 819 μm long unit cell. The effect of bias voltage on...
Gallium Nitride High-Electron-Mobility Transistors (GaN HEMTs) are promising devices for high-frequency and high-power density converters, but some of their applications (e.g., motor drives) require high robustness levels. In this scenario, 600 V normally-off p-GaN gate HEMTs are studied under Short-Circuit (SC) by experiment and physics-based simulations (drift-diffusion and thermodynamic models)...
Biomass waste for hydrogen production is an important goal for the Hydrogen Economy. In this paper is reported the research of corn cob and stem of faba bean agricultural waste by hydrolysis for sugar production. Acid hydrolysis was performed in 1 g of dried raw material per 15 mL of different H3PO4 acid solutions heated at 100°C and 130°C during 2 h. The sugar yield was determined by dinitro salicylic...
Distillation is the most important process in producing fruit distillates, since it defines its aromatic composition. Moreover, it is inevitable to recover toxic compounds during distillation. In particular, methanol, an abundant compound in fruit wines, is toxic for human consumption. Therefore, its concentration may be regulated in alcoholic beverages as lower as possible. The objective of this...
This paper presents wideband tunable band-stop filters working in the Ku to Ka-band frequencies based on a miniature single-MEM device combining a central capacitive MEM switch with AlN dielectric and inductive suspension arms. An outstanding 55% tuning range is achieved thanks to an original device design which features suspended-meander arm inductance with zipping capacitive coupling enabling a...
In this paper, a ring laser configuration for fibre sensing applications based on highly erbium-doped fibres is studied. The proposed configuration uses fibre Bragg grating reflectors in order to select the emission wavelengths. The experimental results have demonstrated that the topology arranged in a hybrid serial-tree configuration offers excellent performances in terms of temporal laser stability...
This paper describes the development of a laboratory experiment related with drowsiness in order to find patterns in biomedical signals that allow to distinguish the periods of drowsiness, contrasted with sleep phases obtained by EEG analysis and current methods used to detect the fall of attention in drivers.
This paper presents an in-depth study of the design, modelling, circuit parameter extraction and characterization of a distributed MEMS digital microwave phase shifter. Bridge-type digital capacitors periodically loaded on a 5 mm CPW (with an actuation voltage of 22 V) has been fabricated and successfully measured in a wide range of frequencies (1-14 GHZ), achieving a true-time delay of 25 ps. Experimental...
We have grown Si/SiGe modulation doped quantum wells by gas source molecular beam epitaxy using, for the first time, arsenic as an n-type dopant. The layers are characterised by magnetotransport measurements and SIMS analysis. The latter shows an arsenic concentration in excess of 1019 cm??3 along with strong surface segregation.
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