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Microstrip-fed 3D-printed H-sectorial horn phased array
(Multidisciplinary Digital Publishing Institute (MDPI), 2022-07-16)
Article
Open AccessA 3D-printed phased array consisting of four H-Sectorial horn antennas of 200 g weight with an ultra-wideband rectangular-waveguide-to-microstrip-line transition operating over the whole LMDS and K bands (24.25–29.5 GHz) ... -
Increasing stratification as observed by satellite sea surface salinity measurements
(Nature, 2022-12-01)
Article
Open AccessChanges in the Earth’s water cycle can be estimated by analyzing sea surface salinity. This variable refects the balance between precipitation and evaporation over the ocean, since the upper layers of the ocean are the ... -
Evaluation of the nonlinear surface resistance of REBCO coated conductors for their use in the FCC-hh beam screen
(2022-01-07)
Article
Open AccessTo assess the feasibility of using high-temperature superconductors for the beam screens of future circular colliders, we have undertaken a study of the power dependence of the microwave surface resistance in state-of-the-art ... -
Design of minimum nonlinear distortion reconfigurable antennas for next-generation communication systems
(2021-04-01)
Article
Open AccessNonlinear effects in the radio front-end can degrade communication quality and system performance. In this paper we present a new design technique for reconfigurable antennas that minimizes the nonlinear distortion and ... -
A simple low-cost electrocardiogram synchronizer
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-09-01)
Article
Open AccessElectrocardiogram (ECG) synchronization is useful to avoid the effects of cardiac motion in medical measurements, and is widely used in standard medical imaging. A number of medical equipment include embedded commercial ... -
Rayleigh backscattering rejection in single-laser homodyne transceiver for UD-WDM using λ-Shifting
(2021-04-01)
Article
Open AccessWith the aim of using a single laser per transceiver in single fiber splitter-based passive optical networks (PON) with coherent homodyne receivers, we apply wavelength shifting in an ultra-dense wavelength division ... -
A novel digital IQ demodulation for interferometric radiometers
(Multidisciplinary Digital Publishing Institute (MDPI), 2021-03-02)
Article
Open AccessIn the frame of an SMOS follow-on operational mission, a new instrument design is being developed based on the lessons learned from MIRAS, the SMOS payload. To reduce hardware complexity and mass, digital In-phase Quadrature ... -
Characterisation of copper and stainless steel surfaces treated with laser ablation surface engineering
(2021-07)
Article
Open AccessIn the past few years, it has been established that Laser Ablation Surface Engineering (LASE) is a very effective way of producing surfaces which have Secondary Electron Yields (SEY)¿<¿1. This can be achieved with a variety ... -
Optical phase effects in reconfigurable microwave photonic filters with multiple wavelength input
(2021-11)
Article
Open AccessMicrowave photonic filters with a multiple wavelength input are analyzed. A comprehensive model assessing the impact of the phase characteristic of the optical stage is presented from which optimized design rules have been ... -
Algorithm for resonator parameter extraction from symmetrical and asymmetrical transmission responses
(IEEE Microwave Theory and Techniques Society, 2021-08)
Article
Open AccessWe describe an algorithm capable of extracting the unloaded quality factor and the resonant frequency of microwave resonators from vector S-parameters. Both symmetrical (Lorentzian) and asymmetrical (Fano) transmission ... -
Mixed integration of CDIO skills into telecommunication engineering curricula
(2010)
Article
Open AccessSpain has been intensively involved in designing engineering curricula for the last two years and next academic year all engineering schools will be deploying all bachelor programs adapted to the EHEA and to the Spanish ... -
SMOS third mission reprocessing after 10 years in orbit
(Multidisciplinary Digital Publishing Institute (MDPI), 2020-05-01)
Article
Open AccessAfter more than 10 years in orbit, the SMOS team has started a new reprocessing campaign for the SMOS measurements, which includes the changes in calibration and image reconstruction that have been made to the Level 1 ...
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