Browsing by Author "O'Callaghan Castellà, Juan Manuel"
Now showing items 1-20 of 124
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3-D printed UWB microwave bodyscope for biomedical measurements
(2019-02-15)
Article
Open AccessIn this letter, a three-dimensional (3-D) printed compact ultrawideband (UWB) extended gap ridge horn (EGRH) antenna designed to be used for biological measurements of the human body is described. The operational frequency ... -
A general approach for the calculation of intermodulation distortion in cavities with superconducting endplates
(AMER INST PHYSICS, 2003-01-31)
Article
Open AccessWe report on a general procedure to calculate intermodulation distortion in cavities with superconducting endplates that is applicable to the dielectric-loaded cavities currently used for measurement of surface resistance ... -
A General approach for the calculation of intermodulation distortion in cavities with superconducting endplates
(2003-01)
Article
Open AccessWe report on a general procedure to calculate intermodulation distortion in cavities with superconducting endplates that is applicable to the dielectric-loaded cavities currently used for measurement of surface resistance ... -
A general electromagnetic simulation tool to predict the microwave nonlinear response of planar, arbitrarily-shaped HTS structures
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2001-03-31)
Article
Open AccessThis 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 ... -
A large signal nonlinear MODFET model from small signal S-parameters
(Institute of Electrical and Electronics Engineers (IEEE), 1989)
Conference report
Open AccessA general technique for predicting the MODFET large signal performance has been developed. The technique is based entirely on experimental data (small signal S-parameters at different biased points) and therefore is ... -
A large signal nonlinear MODFET model from small signal S-parameters
(1989)
Conference report
Open AccessA general technique for predicting the MODFET large signal performance has been developed. The technique is based entirely on experimental data (small signal S-parameters at different biased points) and therefore is ... -
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 ... -
A submillimeter wave parabolic reflector by additive manufacturing
(Institute of Electrical and Electronics Engineers (IEEE), 2018)
Conference report
Restricted access - publisher's policyThe manufacturing of prototype of an offset parabolic reflector to operate at 120 GHz is presented. The paper describes the different metallization options to achieve a good performance. -
A vector approach for noise parameter fitting and selection of source admittances
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1991-08-31)
Article
Open AccessSimple vector concepts can be used in the determination of noise parameters from measured data. The use of such concepts leads to a simplification in the least-square fitting algorithm, complete determination of the ... -
A Vector Approach for Noise Parameter Fitting and Selection of Source Admittances
(IEEE Microwave Theory and Techniques Society, 1991-08)
Article
Open AccessSimple vector concepts can be used in the determination of noise parameters from measured data. The use of such concepts leads to a simplification in the least-square fitting algorithm, complete determination of the ... -
Absorptive limiter for frequency-selective circuits
(2014-06-01)
Article
Restricted access - publisher's policyThis letter describes a novel absorptive limiter for frequency-selective circuits. The proposed circuit allows the design of absorptive limiters based on a bi-state phase shifter, which is appropriate for integration into ... -
Accuracy considerations in microstrip surface impedance measurements
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1997-06-30)
Article
Open AccessAn approach is proposed for the design, measurement and data extraction of superconducting microstrip resonators used in determination of surface resistance and penetration depth. Major sources of error are analyzed and ... -
Accuracy considerations in surface impedance measurements
(1997-06)
Article
Open AccessAn approach is proposied for the design, measurement and data extraction of superconducting microstrip resonators used in determination of surface resistance and penetration depth. Major sources of error are analyzed and ... -
Accurate determination of dielectric properties in small, high-permittivity dielectric cylinders
(Institute of Electrical and Electronics Engineers (IEEE), 2022)
Conference lecture
Open AccessWe describe a method for performing cryogenic permittivity and loss tangent measurements of small (few mm), high-permittivity dielectric cylinders used in surface impedance measurement of superconductors. We combine the ... -
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 ... -
Analysis and Simulation of Distributed Nonlinearities in Ferroelectrics and superconductors for Microwave Applications
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-03-31)
Article
Open AccessThis 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
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-03-31)
Article
Open AccessThis 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 ... -
Analysis of dielectric-loaded cavities for characterization of the nonlinear properties of high temperature superconductors
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2003-06-30)
Article
Open AccessThis 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
(1993-03)
Article
Open AccessEthylenediamine 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
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1993-03-31)
Article
Open AccessEthylenediamine 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 ...
