Exploració per tema "Microwave devices"

Ara es mostren els items 1-19 de 19

    • A general electromagnetic simulation tool to predict the microwave nonlinear response of planar, arbitrarily-shaped HTS structures 

      Parrón Granados, Josep; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rius Casals, Juan Manuel; Duffo Ubeda, Núria; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
      Article
      Accés obert
      This work describes a simulation tool being developed at UPC to predict the microwave nonlinear behavior of planar superconducting structures with very few restrictions on the geometry of the planar layout. The software ...

    • Algorithm for resonator parameter extraction from symmetrical and asymmetrical transmission responses 

      Krkotic, Patrick; Gallardo Moix, Queralt; Tagdulang, Nikki; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 2021-08)
      Article
      Accés obert
      We 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 ...

    • Analysis and Simulation of Distributed Nonlinearities in Ferroelectrics and superconductors for Microwave Applications 

      Seron, David; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-03-31)
      Article
      Accés obert
      This paper gives closed-form equations for the intermodulation and third harmonic signals generated in a nonlinear transmission line with distributed quadratic nonlinearities in the conductor and dielectric. Although the ...

    • Analysis and Simulation of the Effects of Distributed Nonlinearities in Microwave Superconducting Devices 

      Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-03-31)
      Article
      Accés obert
      This paper presents a comprehensive study of microwave nonlinearities in superconductors, with an emphasis on intermodulation distortion and third-harmonic generation. It contains the analysis of various resonant and ...

    • Automatic polyp detection using microwave endoscopy for colorectal cancer prevention and early detection: phantom validation 

      Garrido Atienza, Alejandra; Sont Colomer, Roberto; Dghoughi, Walid; Marcoval Martínez, Sergi; Romeu Robert, Jordi; Fernández-Esparrach, Glòria; Belda Reig, Ignasi; Guardiola Garcia, Marta (Institute of Electrical and Electronics Engineers (IEEE), 2021)
      Article
      Accés obert
      A system to integrate microwave imaging with optical colonoscopy is presented. The overarching goal is to improve the prevention and early diagnosis of one of the main health and economic burdens of an increasingly aging ...

    • Comprehensive circuit model of auto-limiting superconductor devices and systems 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; O'Callaghan Castellà, Juan Manuel; García Pastor, David; Perea Robles, Rafael; Joshi, N.; Lu, X.; Orloff, Nathan D.; Booth, James C. (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from a superconducting state to a normal state. This phenomenon allows ...

    • Comprehensive circuit model of autolimiting superconductor devices 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Hueltes Escobar, Alberto; O'Callaghan Castellà, Juan Manuel; García Pastor, David; Perea Robles, Rafael; Joshi, N.; Lu, X.; Orloff, Nathan D.; Booth, James C. (2017-06-01)
      Article
      Accés obert
      This paper presents a phenomenological equivalent circuit to model the phenomenon occurring when a section of superconducting transmission line transits from a superconducting state to a normal state. This phenomenon allows ...

    • Digital back-end for RFI detection and mitigation in microwave radiometers 

      Forte Veliz, Giuseppe Francesco; Camps Carmona, Adriano José; Ramos, I.; Vall-Llossera Ferran, Mercedes Magdalena (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Radio-frequency interference (RFI) is a serious problem in microwave radiometry. In order to process the received data in real time, a powerful back-end for RFI detection and mitigation system must be implemented. This ...

    • Feed-forward technique to measure S-parameters under jamming CW high power out-of-band signals 

      González Rodríguez, Marta (Universitat Politècnica de Catalunya, 2017-07-07)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      In recent years, high-power radio frequency (RF) devices have become increasingly common due in part, to the high-speed telecommunications industry. The evolution of mobile devices drives to the use of wireless applications ...

    • General electromagnetic simulation tool to predict the microwave nonlinear response of planar, arbitrarily-shaped HTS structures 

      Parrón Granados, Josep; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Rius Casals, Juan Manuel; Duffo Ubeda, Núria; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
      Article
      Accés obert
      This work describes a simulation tool being developed at UPC to predict the microwave nonlinear behavior of planar superconducting structures with very few restrictions on the geometry of the planar layout. The software ...

    • Generic simulator for conical scanning microwave radiometers 

      Hyuk, Park; Camps Carmona, Adriano José; Querol Borràs, Jorge (Institute of Electrical and Electronics Engineers (IEEE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work describes a software tool developed for ESA within the project BIBLOS-2 (BuIlding BLOcks for earth observation mission performance simulator) to model typical conical scanning microwave radiometers in a generic ...

    • Hilbert fractal curves for HTS miniaturized filters 

      Barra Bizinotto, Marilda; Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2004)
      Text en actes de congrés
      Accés obert
      This work presents novel compact High Temperature Superconductor (HTS) microstrip resonators based on Hilbert fractal curves. Their miniaturization performance has been investigated, emphasizing the parameters which allow ...

    • HTS nonlinearities in microwave disk resonators 

      Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Shaw, Timothy J.; O'Callaghan Castellà, Juan Manuel (ELSEVIER SCIENCE BV, 2002-08-31)
      Article
      Accés obert
      This article describes a procedure for the calculation of the intermodulation behavior of the TM010 mode in high temperature superconducting (HTS) disk resonators from a description of the local HTS nonlinearities. Successful ...

    • Microwave-microfluidic measurement system optimization for bio-particle-sensing with coplanar-electrodes 

      Palacios Arias, César Augusto; Jofre Cruanyes, Marc; Jofre Cruanyes, Lluís; Trabal Pou, Arnau; Coll Beltran, Mercè; Rodríguez Gargallo, Marta; Romeu Robert, Jordi; Jofre Roca, Lluís (Íñigo Cuiñas Gómez, 2021)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Microwave and microfluidic techniques may enable wireless monitoring and interaction with bio-particles, yet still is a largely uncharted territory. Fortunately, the requirements of microfluidics and microwave techniques ...

    • Model predicts large-signal modfet performance 

      O'Callaghan Castellà, Juan Manuel; Beyer, J. B. (PENTON MEDIA, INC, 1989-11-30)
      Article
      Accés obert
      Modulation doped FETs (MODFETs) provide low-noise performance in many medium- and high-power microwave applications. Unfortunately, there are few large-signal models available for MODFETs, and determining the parameters ...

    • Modeling superconducting transmission line bends and their impact on nonlinear effects. 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-05-31)
      Article
      Accés obert
      This paper reports on a numerical technique to obtain the current distribution in the annular bent sections of planar layouts. This is used to obtain the linear and nonlinear circuit distributed parameters modeling a ...

    • Nonlinear Simulation and Characterization of HTS Devices using Harmonic Balance Algorithms 

      Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
      Article
      Accés obert
      This work presents the use of Harmonic Balance to simulate the nonlinear behavior of HTS transmission lines. Good agreement with theoretical cross-checks is found. We also show the use of this algorithm to fit the model ...

    • PAU instrument aboard INTA MicroSat-1: flight model tests 

      Alonso González, Alberto; Camps Carmona, Adriano José; Pascual Biosca, Daniel; Hyuk, Park; Alcayde Egea, Antonio; Chavero, Sergio; Martinez, Pedro; Crespo, Luis; Angulo, Manuel; Rius, Antonio (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work presents the PAU instrument aboard the satellite INTA MicroSAT-1. The PAU instrument is a combination of a Radiometer and a GNSS Reflectometer designed to study the relationship GNSS-R observables (Delay Doppler ...

    • Sea surface salinity and wind speed retrievals using GNSS-R and L-band microwave radiometry data from FMPL-2 onboard the FSSCat mission 

      Muñoz Martin, Joan Francesc; Camps Carmona, Adriano José (Multidisciplinary Digital Publishing Institute (MDPI), 2021-08-13)
      Article
      Accés obert
      The Federated Satellite System mission (FSSCat), winner of the 2017 Copernicus Masters Competition and the first ESA third-party mission based on CubeSats, aimed to provide coarse-resolution soil moisture estimations and ...