Luisa de la Fuente
A5071162385- Superconducting and THz Device Technology
- Radio Frequency Integrated Circuit Design
- Radio Astronomy Observations and Technology
- Microwave Engineering and Waveguides
- Cosmology and Gravitation Theories
- Soil Moisture and Remote Sensing
- Advanced Thermodynamic Systems and Engines
- Dark Matter and Cosmic Phenomena
- Advanced Power Amplifier Design
- Scientific Research and Discoveries
- Microwave and Dielectric Measurement Techniques
- Semiconductor Quantum Structures and Devices
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Frequency and Time Standards
- Particle physics theoretical and experimental studies
- Silicon Carbide Semiconductor Technologies
- Semiconductor materials and interfaces
- Semiconductor Lasers and Optical Devices
- Precipitation Measurement and Analysis
- Particle Detector Development and Performance
Universidad de Cantabria
2015-2024
Universidad Autónoma de Madrid
2012
Universitat Politècnica de Catalunya
2005
Consejo Superior de Investigaciones Científicas
1992
In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of Planck space mission, ESA program dedicated to precision imaging cosmic microwave background (CMB). Planck-LFI will observe full sky in intensity polarisation three frequency bands centred at 30, 44 70 GHz, while higher frequencies (100-850 GHz) be covered by HFI instrument. The LFI is an array radiometers based on state-of-the-art Indium Phosphide cryogenic HEMT amplifiers implemented a...
We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in range 330-460 $\mu$eV, within W-band (80-110 GHz), an unexplored parameter space well-motivated window of Quantum ChromoDynamics (QCD) axions. The experimental design consists microwave resonant cavity haloscope high static magnetic field coupled highly sensitive detecting system based on Kinetic Inductance Detectors via optimized quasi-optics (horns and mirrors)....
The QUIJOTE (Q-U-I JOint Tenerife) CMB Experiment will operate at the Teide Observatory with aim of characterizing polarisation and other processes Galactic extragalactic emission in frequency range 10-40GHz large medium angular scales. first two telescopes multi-frequency (10-30GHz) instrument are already built have been tested laboratory. QUIJOTE-CMB be a valuable complement low frequencies for Planck mission, required sensitivity to detect primordial gravitational-wave component if...
Abstract In this work, we report the synthesis and characterization of different kinds graphene nanomaterials their applicability to development biosensing platforms. We have synthesized oxide (GO) following a modified Hummer’s method, which has been subsequently reduced by electrochemical procedures. This reduction strategy precludes employment toxic solvents, leading product, electrochemically (ERG), free contaminants. The performed techniques such as X‐ray diffraction spectroscopy (XRD),...
We give the calibration and scientific performance parameters of Planck Low Frequency Instrument (LFI) measured during ground cryogenic test campaign. These characterise instrument response constitute our best pre-launch knowledge LFI performance. The shows excellent $1/f$ stability rejection instrumental systematic effects; noise that is most sensitive its kind. set will be updated flight operations through end mission.
The PLANCK mission of the European Space Agency is devoted to produce sky maps cosmic microwave background radiation. low-frequency instrument a wide-band cryogenic radiometer array operating at 30, 44, and 70 GHz. design, test techniques, performance complete differential 30 GHz are presented. This elegant breadboard 30-GHz composed front-end module (FEM) assembled Jodrell Bank Observatory, Cheshire, U.K., back-end Universidad de Cantabria, Spain, Telecomunicacio/spl acute/, Universitat...
According to the reverberation model for broad emission line variability in active galactic nuclei, emission-line luminosity at a given epoch may be expressed formally as convolution of input ionizing continuum light curve with transfer function, form which depends on properties emitting material. Here, functions are calculated several simple models broad-line region characterized by various geometrical configurations and velocity fields
The QUIJOTE-CMB project has been described in previous publications.Here we present the current status of QUIJOTE multi-frequency instrument (MFI) with five separate polarimeters (providing 5 independent sky pixels): two which operate at 10-14 GHz, 16-20 and a central polarimeter 30 GHz.The optical arrangement includes conical corrugated feedhorns staring into dual reflector crossed-draconian system, provides optimal cross-polarization properties (designed to be < -35 dB) symmetric...
This paper describes a dedicated nonlinear MESFET model, which was used to accurately represent the device's drain-source current nonlinearity. An analytical expression is proposed, based on Shockley approach, with good derivative reproduction. The evolution of Ids(Vgs, Vds) Taylor-series-expansion coefficients across V/sub GS/ and DS/ revealed not only presence important minimum conversion loss bias, but also in-band intermodulation distortion sweet spots that have been optimize an FET...
The Planck Low Frequency Instrument (LFI) radiometers have been tested extensively during several dedicated campaigns. present paper reports the principal noise properties of LFI radiometers.
A novel four-state full Q-band waveguide phase shifter based on smooth-ridged sections is presented. The structure combines differential 90° and 180° shifters, whose combination provides the four-phase states (0°, 90°, 180°, 270°) by appropriately controlling a set of millimeter-wave switches. Each performed using an E-plane continuous profile ridge to reach or shift, respectively. module outstanding performance covering (33-50 GHz) with average results 93.5°, 182.8°, 270.6°.
This paper presents the analysis, design, and characterization of thirty gigahertz instrument receiver developed for Q-U-I Joint Tenerife experiment. The is aimed to obtain polarization data cosmic microwave background radiation from sky, obtaining Q, U, I Stokes parameters incoming signal simultaneously. A comprehensive analysis theory behind proposed presented a linearly polarized input signal, functionality tests have demonstrated adequate results in terms parameters, which validate...
QUIJOTE (Q-U-I JOint TEnerife) is a new polarimeter aimed to characterize the polarization of Cosmic Microwave Background and other Galactic extragalactic signals at medium large angular scales in frequency range 10-40 GHz. The multi-frequency (10-20~GHz) instrument, mounted on first telescope, saw light November 2012 from Teide Observatory (2400~m a.s.l). During 2014 second telescope has been installed this observatory. A instrument 30~GHz will be ready for commissioning during summer 2015,...
We present numerical simulations of the response broad emission lines in active galactic nuclei to ionizing continuum variations. The are based on discrete-cloud model broad-line region and employ a 'realistic' light curve. line curve evolution profile calculated for series models covering wide range effective radius, illustrating number properties 'point-source reverberation model' emission-line variability. also use discuss reliability physical interpretation various analysis techniques....
This paper describes a dedicated nonlinear MESFET model extraction technique, which was used to accurately characterize the device's channel resistance nonlinearity. Plotting Ids(Vgs,Vds) Taylor series expansion coefficients across V/sub GS/ and DS/ revealed not only presence of important minimum conversion loss bias, but also in-band IMD sweet spots that were then optimize FET resistive mixer performance.
The 30 and 44 GHz Back End Modules (BEM) for the Planck Low Frequency Instrument are broadband receivers (20% relative bandwidth) working at room temperature. signals coming from Front Module amplified, band pass filtered finally converted to DC by a detector diode. Each receiver has two identical branches following differential scheme of radiometers. BEM design is based on MMIC Noise Amplifiers using GaAs P-HEMT devices, microstrip filters Schottky diode detectors. Their manufacturing...
The Low Frequency Instrument (LFI) on-board the ESA Planck satellite carries eleven radiometer subsystems, called Radiometer Chain Assemblies (RCAs), each composed of a pair pseudo-correlation receivers. We describe on-ground calibration campaign performed to qualify flight model RCAs and measure their pre-launch performances. Each RCA was calibrated in dedicated flight-like cryogenic environment with front-end cooled 20K back-end at 300K, an external input load 4K. A matched simulating...
The QUIJOTE (Q-U-I JOint Tenerife) CMB Experiment is designed to observe the polarization of Cosmic Microwave Background and other Galactic extragalactic signals at medium large angular scales in frequency range 10-40 GHz. first two telescopes multi-frequency (10-20 GHz) instrument have been operation since November 2012. In 2014 a second telescope new 30GHz will be ready for commissioning, an additional 40 GHz its final design stages. After three years effective observations, data obtained...
A low-noise pseudomorphic HEMT Ku-band oscillator with varactor frequency tuning and voltage power control is reported. The circuit size, including the pads for on-wafer testing, less than 0.7 mm/sup 2/. On-wafer measurements show a bandwidth of 600 MHz centered at /spl sim/15.2 GHz an output up to 17 dBm more 15 dB control. Phase noise -87 dBc/Hz 100 kHz has been obtained, which excellent result fully monolithic integrated voltage-controlled (VCO).
QUIJOTE (Q-U-I JOint TEnerife) is an experiment designed to achieve CMB B-mode polarization detection and sensitive enough detect a primordial gravitational-wave component if the amplitude larger than r = 0.05. It consists in two telescopes three instruments observing frequency range 10-42 GHz installed at Teide Observatory Canary Islands, Spain. The strategy includes raster scan deep integration fields for cosmology, nominal wide survey covering Northen Sky specific observations regions of...
An array of superconducting kinetic inductance detectors (KID) has been fabricated and it demonstrated absorption at W-Band. The use a bi-layer structure based on aluminum (AI) titanium (Ti) shows lower critical temperature (T <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">c</inf> ), which allows the detection W-band. A design methodology is presented taking into account KID geometry in order to maximize dual-polarization designed using...
The QUIJOTE Experiment (Q-U-I JOint TEnerife) is a combined operation of two telescopes and three instruments working in the microwave band to measure polarization Cosmic Microwave Background (CMB) from northern hemisphere, at medium large angular scales. experiment located Teide Observatory Tenerife, one seven Canary Islands (Spain). project consortium maintained by several institutions: Instituto de Astrofísica Canarias (IAC), Física Cantabria (IFCA), Communications Engineering Department...
This paper presents a direct and robust analysis technique for evaluating nonlinear distortion phenomena in FET mixers excited by multitone signals. Time-varying Volterra-series has previously been proven to be appropriate small-signal intermodulation-distortion calculations simple RF Spectral convolutions of the suitably mapped control voltages are introduced this order solve current source narrow-band modulated or broad-band multicarrier Simulations measurements properly characterized...