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View article: Cross-Polarization Reduction in Kinetic Inductance Detectors Based on Quasi-Lumped Resonators
Cross-Polarization Reduction in Kinetic Inductance Detectors Based on Quasi-Lumped Resonators Open
Kinetic Inductance Detectors (KIDs) have emerged as a leading technology for millimeter- and submillimeter-wave astronomy due to their high sensitivity, natural multiplexing capabilities and scalable fabrication. In polarization-sensitive …
View article: The CADEx Experiment: A new haloscope axion search in the 330-460 micro-eV mass range at the Canfranc Underground Laboratory (LSC)
The CADEx Experiment: A new haloscope axion search in the 330-460 micro-eV mass range at the Canfranc Underground Laboratory (LSC) Open
The Canfranc Axion Detection Experiment (CADEx) will search for dark matter axions in the W-band (80–110 GHz) using a multiple cavity haloscope and highly sensitive Kinetic Inductance Detectors. A summary of the experiment and progress tow…
View article: Optimized Cross-Polarized LEKIDs for <i>W</i>-Band Using Sawtooth Inductors
Optimized Cross-Polarized LEKIDs for <i>W</i>-Band Using Sawtooth Inductors Open
Lumped-element kinetic inductance detectors (LEKIDs) based on sawtooth inductors for $W$ -band are presented in this article. A careful analysis is carried out for the cross-polarization in the inductor geometry, which brings out the absor…
View article: Development of W-Band Dual-Polarization Kinetic Inductance Detectors on Silicon
Development of W-Band Dual-Polarization Kinetic Inductance Detectors on Silicon Open
A polarimetric detector in the W-band based on Lumped-Element Kinetic Inductance Detectors (LEKIDs) is presented. Each single optical element consists of two Ti/Al LEKIDs placed in orthogonal configuration on both sides of a Silicon substr…
View article: Multifrequency Microwave Radiometry for Characterizing the Internal Temperature of Biological Tissues
Multifrequency Microwave Radiometry for Characterizing the Internal Temperature of Biological Tissues Open
The analysis of near-field radiometry is described for characterizing the internal temperature of biological tissues, for which a system based on multifrequency pseudo-correlation-type radiometers is proposed. The approach consists of a ne…
View article: The Canfranc Axion Detection Experiment (CADEx): search for axions at 90 GHz with Kinetic Inductance Detectors
The Canfranc Axion Detection Experiment (CADEx): search for axions at 90 GHz with Kinetic Inductance Detectors Open
We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in the range 330–460 μ eV, within the W-band (80–110 GHz), an unexplored parameter space in the well-motivated dark mat…
View article: The Canfranc Axion Detection Experiment (CADEx): Search for axions at 90 GHz with Kinetic Inductance Detectors
The Canfranc Axion Detection Experiment (CADEx): Search for axions at 90 GHz with Kinetic Inductance Detectors Open
We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in the range 330-460 $μ$eV, within the W-band (80-110 GHz), an unexplored parameter space in the well-motivated dark ma…
View article: Performance Assessment of W-Band Radiometers: Direct versus Heterodyne Detections
Performance Assessment of W-Band Radiometers: Direct versus Heterodyne Detections Open
W-Band radiometers using intermediate frequency down-conversion (super-heterodyne) and direct detection are compared. Both receivers consist of two W-band low noise amplifiers and an 80-to-101 GHz filter, which conforms to the reception fr…
View article: Analysis and Performance Assessment of a Real-Time Correction Pseudo-Correlation Microwave Radiometer for Medical Applications
Analysis and Performance Assessment of a Real-Time Correction Pseudo-Correlation Microwave Radiometer for Medical Applications Open
A new configuration of a pseudo-correlation type radiometer is proposed for a microwave biomedical application, such as diabetic foot neuropathy. The new approach as well as its simulated performance are thoroughly assessed using commercia…
View article: Calibration of a Polarimetric Microwave Radiometer Using a Double Directional Coupler
Calibration of a Polarimetric Microwave Radiometer Using a Double Directional Coupler Open
This paper presents a built-in calibration procedure of a 10-to-20 GHz polarimeter aimed at measuring the I, Q, U Stokes parameters of cosmic microwave background (CMB) radiation. A full-band square waveguide double directional coupler, mo…
View article: Broadband polarimeter receivers at 30 and 40 GHz for cosmic microwave background measurement
Broadband polarimeter receivers at 30 and 40 GHz for cosmic microwave background measurement Open
Broadband radiometers at 30 and 40 GHz for QUIJOTE radio astronomy experiment are very sensitive receivers to perform scientific sky observations of the Cosmic Microwave Background (CMB). The aim of this experiment is the linear polarizati…
View article: Bi-Layer Kinetic Inductance Detectors for W-Band
Bi-Layer Kinetic Inductance Detectors for W-Band Open
An array of superconducting kinetic inductance detectors (KID) has been fabricated and it has demonstrated absorption at W-Band. The use of a bi-layer structure based on aluminum (AI) and titanium (Ti) shows a lower superconducting critica…
View article: 10- to 19.5-GHz microwave receiver of an electro-optical interferometer for radio astronomy
10- to 19.5-GHz microwave receiver of an electro-optical interferometer for radio astronomy Open
This document describes the analysis, design, and prototype test results of the microwave section of a 10- to 19.5-GHz interferometer, aimed at obtaining polarization data of cosmic microwave background (CMB) radiation from the sky. First,…
View article: A Microwave Polarimeter Demonstrator for Astronomy with Near-Infra-Red Up-Conversion for Optical Correlation and Detection
A Microwave Polarimeter Demonstrator for Astronomy with Near-Infra-Red Up-Conversion for Optical Correlation and Detection Open
This paper presents a 10 to 20 GHz bandwidth microwave polarimeter demonstrator, based on the implementation of a near-infra-red frequency up-conversion stage that allows both the optical correlation, when operating as a synthesized-image …
View article: Broad-band high-resolution rotational spectroscopy for laboratory astrophysics
Broad-band high-resolution rotational spectroscopy for laboratory astrophysics Open
We present a new experimental set-up devoted to the study of gas phase molecules and processes using broad-band high spectral resolution rotational spectroscopy. A reactor chamber is equipped with radio receivers similar to those used by r…
View article: Microstrip broadband thin-film attenuators without via-hole-ground at millimeter wave frequencies
Microstrip broadband thin-film attenuators without via-hole-ground at millimeter wave frequencies Open
A comprehensive design methodology for microstrip broadband attenuators is presented. Closed-form design equations are given for two types of distributed attenuators. The attenuators are based on a cascade connection of thin-film resistors…
View article: Octave bandwidth hybrid-coupled microstrip diplexer for a broadband radio astronomy receiver
Octave bandwidth hybrid-coupled microstrip diplexer for a broadband radio astronomy receiver Open
A new octave bandwidth high selectivity compact microstrip diplexer working in the band from 10 to 20 GHz is presented, intended to be a part of an electro-optical interferometer covering the whole frequency band. The circuit is based on t…
View article: The QUIJOTE Experiment: Prospects for CMB B-MODE polarization detection and foregrounds characterization
The QUIJOTE Experiment: Prospects for CMB B-MODE polarization detection and foregrounds characterization Open
QUIJOTE (Q-U-I JOint TEnerife) is an experiment designed to achieve CMB B-mode polarization detection and sensitive enough to detect a primordial gravitational-wave component if the B-mode amplitude is larger than r = 0.05. It consists in …
View article: Cryogenic broadband Q-band MMIC low-noise amplifier
Cryogenic broadband Q-band MMIC low-noise amplifier Open
The design of a broad-band monolithic cryogenic low-noise amplifier (MMIC LNA) in the Q band, aimed to be used in radio-astronomy receiver front-end modules is presented. A 70 nm gate-length GaAs mHEMT process from OMMIC foundry is used to…
View article: Q-band 4-state phase shifter in planar technology: Circuit design and performance analysis
Q-band 4-state phase shifter in planar technology: Circuit design and performance analysis Open
A 30% bandwidth phase shifter with four phase states is designed to be integrated in a radio astronomy receiver. The circuit has two 90° out-of-phase microwave phase-shifting branches which are combined by Wilkinson power dividers. Each br…
View article: QUIJOTE Experiment: status of telescopes and instrumentation
QUIJOTE Experiment: status of telescopes and instrumentation Open
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 the polarization of the Cosmic Microwave Background (CMB) from the northern hemisphere, …
View article: Low noise amplifiers for MetOp-SG
Low noise amplifiers for MetOp-SG Open
We present low-noise amplifiers (LNA) that have been developed in the framework of two pre-qualification ESA projects for frequencies between 54 and 229 GHz for the METOP-SG satellite program. The main goal of these satellites is water vap…
View article: Performance evaluation of a lossy transmission lines based diode detector at cryogenic temperature
Performance evaluation of a lossy transmission lines based diode detector at cryogenic temperature Open
This work is focused on the design, fabrication, and performance analysis of a square-law Schottky diode detector based on lossy transmission lines working under cryogenic temperature (15 K). The design analysis of a microwave detector, ba…
View article: Noise conversion of Schottky diodes in mm-wave detectors under different nonlinear regimes: modeling and simulation versus measurement
Noise conversion of Schottky diodes in mm-wave detectors under different nonlinear regimes: modeling and simulation versus measurement Open
This paper presents and discusses several methods for predicting the low-frequency (LF) noise at the output of a mm-wave detector. These methods are based on the extraction of LF noise source parameters from the single diode under a specif…
View article: Broadband low-noise GaN HEMT TWAs using an active distributed drain bias circuit
Broadband low-noise GaN HEMT TWAs using an active distributed drain bias circuit Open
Modern communication and radar systems show an increasing demand for robust ultra-broadband amplifiers for low-noise applications. A set of three different 0.5 GHz to 20 GHz MMIC LNAs using a GaN HEMT technology with a gate length of 0.25 …
View article: The Thirty Gigahertz Instrument Receiver for the QUIJOTE Experiment: Preliminary Polarization Measurements and Systematic-Error Analysis
The Thirty Gigahertz Instrument Receiver for the QUIJOTE Experiment: Preliminary Polarization Measurements and Systematic-Error Analysis Open
This paper presents preliminary polarization measurements and systematic-error characterization of the Thirty Gigahertz Instrument receiver developed for the QUIJOTE experiment. The instrument has been designed to measure the polarization …
View article: The QUIJOTE experiment: project overview and first results
The QUIJOTE experiment: project overview and first results Open
QUIJOTE (Q-U-I JOint TEnerife) is a new polarimeter aimed to characterize the polarization of the Cosmic Microwave Background and other Galactic and extragalactic signals at medium and large angular scales in the frequency range 10-40 GHz.…