Exploració per autor "O'Callaghan Castellà, Juan Manuel"
Ara es mostren els items 18-37 de 124
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Analysis of dielectric-loaded cavities for characterization of the nonlinear properties of high temperature superconductors
Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-06-30)
Article
Accés obertThis work describes and compares two alternative methods of analyzing dielectric-loaded cavities for measurement of intermodulation distortion in HTS films. One of them is based on assuming a specific type of HTS nonlinearities ... -
Application of selective leaching in fabrication of thin film ybco devices
James, Pm; O'Callaghan Castellà, Juan Manuel (1993-03)
Article
Accés obertEthylenediamine solutions have been shown to turn bulk YBCO into insulating materials. The effect of these solutions on thin YBCO films is studied. In both unpatterned and patterned films, a smooth decrease in critical ... -
Application of selective leaching in fabrication of thin film ybco devices
James, P. M.; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-03-31)
Article
Accés obertEthylenediamine solutions have been shown to turn bulk YBCO into insulating materials. The effect of these solutions on thin YBCO films is studied. In both unpatterned and patterned films, a smooth decrease in critical ... -
Banco automatizado para la medida de parámetros S, de ruido y características DC de transistores en oblea
Pradell i Cara, Lluís; Purroy, Francesc; Subirats, M.; Ballester, A.; Torres Torres, Francisco; O'Callaghan Castellà, Juan Manuel; Corbella Sanahuja, Ignasi (1994)
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Accés obertThe AMR Group has an automatized bench for the measurement of DC-characteristics, [S] parameters (45 MHz- 40 GHz) and noise parameters (2-26.5 GHz) of microwave on-wafer transistors. The hardware configuration is described, ... -
Characterisation of copper and stainless steel surfaces treated with laser ablation surface engineering
Hannah, Adrian N.; Krkotic, Patrick; Valizadeh, Reza; Malyshev, Oleg; Mutch, J.; Whitehead, David J.; Pont, Montse; O'Callaghan Castellà, Juan Manuel; Dhanak, Vinod R. (2021-07)
Article
Accés obertIn 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 ... -
Coated conductor technology for the beamscreen chamber of future high energy circular colliders
Puig Molina, Teresa; Krkotic, Patrick; Romanov, Artur; O'Callaghan Castellà, Juan Manuel; Gutiérrez Royo, Joffre (2019-09-01)
Article
Accés obertThe surface resistance of state-of-the-art REBa2Cu3O7-x coated conductors has been measured at 8 GHz versus temperature and magnetic field. We show that the surface resistance of REBa2Cu3O7-x strongly depends on the ... -
Compact duplexer with miniaturized dual loop resonator
Collado Gómez, Juan Carlos; Pozo Vicente, Javier; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2005)
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Accés obertThis work presents a very compact duplexer based on novel miniaturized loaded-close-loop dual resonators. Two different dual resonators are used to establish the two bands, corresponding to the transmitter and the receiver ... -
Comparison between nonlinear measurements in patterned and unpatterned thin films
Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; O'Callaghan Castellà, Juan Manuel (IOP PUBLISHING LTD, 2004-07-31)
Article
Accés obertThis work compares two alternative methods of characterizing the nonlinearities in a 10 × 10 mm2 superconducting thin film. Both methods are based on measuring the intermodulation distortion in high temperature superconducting ... -
Comparison of lossy filters and predistorted filters using novel software
Padilla Díaz, Alberto; Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Ernst, Cristoph; Rius Casals, Juan Manuel; Tamayo Palau, José María; O'Callaghan Castellà, Juan Manuel (IEEE Microwave Theory and Techniques Society, 2010)
Comunicació de congrés
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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'editorialThis 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 obertThis 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 ... -
Contactless electrical resistance of 2D materials using a rutile resonator
Arcos Gutiérrez, David; Krkotic, Patrick; O'Callaghan Castellà, Juan Manuel; Pont, Montse; Ametller Congost, Lluís; Ferrer Anglada, Núria (2019-12-12)
Article
Accés obertMeasuring the electrical surface resistance of 2D materials without contact can provide a method for obtaining their intrinsic characterisation. The aim of this paper is to show that a rutile dielectric resonator (RDR) can ... -
Correction to "Nonlinear Analysis of Disk Resonators: Application to Material Characterization and Filter Design
Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; O'Callaghan Castellà, Juan Manuel (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-12-31)
Article
Accés obertA procedure for the numerical prediction of the microwave nonlinear behavior (intermodulation products, degradation of quality factors, etc.) of TM010 disk resonators has been developed. The procedure is based on relating ... -
Design and fabrication of coplanar YBCO structures on lithium niobate substrates
Rozan, Edouard; Collado Gómez, Juan Carlos; García, A.; O'Callaghan Castellà, Juan Manuel; Pous Andrés, Rafael; Fàbrega i Soler, Lluís; Rius Casals, Juan Manuel; Rubí, R.; Fontcuberta, Josep; Harackiewicz, F. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1999-06-30)
Article
Accés obertYBa2Cu3O7-δ (YBCO) with low RF losses has been successfully deposited onto lithium niobate (LNO) to improve the performance of electrooptic Mach-Zender modulators. Epitaxial, c-axis oriented superconducting YBCO thin films ... -
Design and fabrication of coplanar YBCO structures on lithium niobate substrates
Rozan, Edouard; Collado Gómez, Juan Carlos; Garcia, Alfredo; O'Callaghan Castellà, Juan Manuel; Pous Andrés, Rafael; Fàbrega Sanchez, Lourdes; Rius Casals, Juan Manuel; Rubí, R.; Fontcuberta, J.; Harackiewicz, F. (1999-06)
Article
Accés obertYBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) with low RF losses has been successfully deposited onto lithium niobate (LNO) to improve the performance of electrooptic Mach-Zender modulators. Epitaxial, c-axis oriented ... -
Determination of pumping and dynamic vacuum properties of conductive quaternary alloy of TiZrVAg non-evaporable getter
Valizadeh, Reza; Hannah, Adrian N.; Malyshev, Oleg; Hsiung, G.Y.; O'Callaghan Castellà, Juan Manuel; Pont, Montse; Tagdulang, Nikki (Joint Accelerator Conferences Website (JACoW), 2022)
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Accés obertNon Evaporable Getter (NEG) coating has been employed extensively in the particle accelerator especial-ly where the vacuum conductance of the vessel is se-verely restricted and ultra-high vacuum condition is required. NEG ... -
Detuning and saturation of superconducting devices: formulation and measurements
Collado Gómez, Juan Carlos; Mateu Mateu, Jordi; Booth, James C.; O'Callaghan Castellà, Juan Manuel (Institute of Electrical and Electronics Engineers, 2007-06)
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Accés obertSaturation and detuning of high temperature superconducting (HTS) resonators and filters may occur due to the inherent nonlinear properties of the superconductor. In HTS transmission lines, these nonlinear properties ... -
Dielectric properties of colon polyps, cancer, and normal mucosa: Ex vivo measurements from 0.5 to 20 GHz
Guardiola, Marta; Buitrago Ventura, Santiago; Fernández-Esparrach, Glòria; O'Callaghan Castellà, Juan Manuel; Romeu Robert, Jordi; Cuatrecasas, Miriam; Córdoba, Henry; González Ballester, Miguel A.; Camara, Oscar (2018-06-15)
Article
Accés obertColorectal cancer is highly preventable by detecting and removing polyps, which are the precursors. 20 Currently, the most accurate test is colonoscopy, but still misses 22% of polyps due to visualization limitations. In ... -
Dielectric resonator to measure surface resistance of accelerator components at room temperature and 77 K
Brunner, Kristóf; Krkotic, Patrick; Costa Pinto, Pedro; Gibbons Díaz-Rato, Eduardo; Pfeiffer, Stephan; Vollenberg, Wilhelmus; Calatroni, Sergio; Barna, Dániel; Pont Montaner, Montserrat; O'Callaghan Castellà, Juan Manuel (American Physical Society (APS), 2023-08)
Article
Accés obertWe measured the surface resistance of titanium, amorphous carbon, and nonevaporable getter (NEG) coatings on copper samples, representative of surface treatments of beam-facing components in the High-Luminosity Large Hadron ... -
Direct extraction of all four transistor noise parameters from 50 noise figure measurements
Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Beltrán, A.; O'Callaghan Castellà, Juan Manuel (IEE, 1998-02-05)
Article
Accés obertA new method for measuring the four noise parameters (NPs) of a transistor is presented. It is based on the determination of its intrinsic noise matrix elements (C11INT, C22INT, Re(C12INT), Im(C12INT)) by fitting the ...