Exploració per tema "Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Radiocomunicació i exploració electromagnètica::Circuits de microones, radiofreqüència i ones mil·limètriques"

Ara es mostren els items 1-20 de 285

    • 100 GHz MST retina for real time near field imaging 

      Garg, Vaibhav (Universitat Politècnica de Catalunya, 2012-06-26)
      Projecte Final de Màster Oficial
      Accés obert
      [ANGLÈS] For an imaging system, a good compromise is needed between the resolution of the image and the penetration ability of the electromagnetic wave. In order to obtain a good resolution, a high frequency system is ...

    • A case of acquisition, transmission and use of information to control a manufacturing process 

      Fernández Román, Laura (Universitat Politècnica de Catalunya, 2009-10-08)
      Projecte Final de Màster Oficial
      Accés obert

    • A general approach for the calculation of intermodulation distortion in cavities with superconducting endplates 

      Mateu Mateu, Jordi; Collado Gómez, Juan Carlos; Menéndez Nadal, Óscar; O'Callaghan Castellà, Juan Manuel (AMER INST PHYSICS, 2003-01-31)
      Article
      Accés obert
      We 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 high dynamic-range RF programmable-gain front end for G.hn RF-Coax in 65-nm CMOS 

      Trulls Fortuny, Xavier; Mateo Peña, Diego; Bofill, Adrià (IEEE Microwave Theory and Techniques Society, 2012-10)
      Article
      Accés restringit per política de l'editorial
      A high-dynamic-range programmable-gain inductorless RF front end suitable for the RF-coax bandplan of the G.hn recommendation is presented. A double-input RF programmable gain amplifier (DI-RFPGA) with switchable capacitive ...

    • A highly-repeatable, broadband 180º phase switch for integrated MEMS processes 

      Llamas Morote, Marco Antonio; Girbau Sala, David; Ribó, M.; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, S.; Coccetti, Favio; Aouba, Stephane (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A broadband 0º/180º phase switch based on a slotline-coplanar-waveguide cross loaded with two MEMS switches in opposed (ON/OFF or OFF/ON) states, is reported. The fabrication was made on high-resistivity silicon substrates ...

    • A low-power-consumption out-of-Plane electrothermal actuator 

      Girbau Sala, David; Llamas Morote, Marco Antonio; Casals Terré, Jasmina; Simó Selvas, Francisco Javier; Pradell i Cara, Lluís; Lázaro Guillén, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2007-06-30)
      Article
      Accés obert
      This paper proposes a new vertical electrothermal actuator. It can be considered as a hybrid between the traditional in-plane buckle-beam actuator and the vertical hot-cold actuator. It is here referred to as vertical ...

    • A method for characterizing coplanar waveguide-to-microstrip transitions, and its application to the measurement of microstrip devices with coplanar microprobes 

      Maya Sánchez, Mª del Carmen; Lázaro Guillén, Antoni; Pradell i Cara, Lluís; Paco, D. de (JOHN WILEY & SONS INC, 2003-12-31)
      Article
      Accés obert
      This paper presents a method for characterizing coplanar waveguide-to-microstrip (CPW-M) transitions by using on-wafer coplanar (CPW) microprobes. It is based on extracting the transmission matrix of the CPW-M transition ...

    • A Method for the Determination of a Distributed FET Noise-Model Based on Matched-Source Noise-Figure Measurements 

      Maya Sánchez, Mª del Carmen; Pradell i Cara, Lluís; Lázaro Guillén, Antoni (JOHN WILEY & SONS INC, 2004-05-31)
      Article
      Accés obert
      A new method for the determination of a distributed FET noise model is presented. It is based on the extraction of the intrinsic noise-correlation matrix of an elemental section of the device from the device's noise figure, ...

    • A multistate single-connection calibration for microwave microfluidics 

      Orloff, Nathan D.; Ma, Xiao; Little, Charles A. E.; Mateu Mateu, Jordi (IEEE Microwave Theory and Techniques Society, 2018-02)
      Article
      Accés obert
      With emerging medical, chemical, and biological applications of microwave-microfluidic devices, many researchers desire a fast and accurate calibration that can be achieved in a single connection. However, traditional ...

    • A new laboratory radio frequency identification (RFID) system for behavioural tracking of marine organisms 

      Sardà Amills, Francesc; Aguzzi, Jacopo; Sbragaglia, Valerio; Sarriá Gandul, David; García, José Antonio; Costa, Corrado; Río Fernandez, Joaquín del; Manuel Lázaro, Antonio; Menesatti, Paolo (2011-10-11)
      Article
      Accés obert
      Radio frequency identification (RFID) devices are currently used to quantify several traits of animal behaviour with potential applications for the study of marine organisms. To date, behavioural studies with marine ...

    • A new tracking system to study the behaviour of species 

      Sarriá Gandul, David; Río Fernandez, Joaquín del; Manuel Lázaro, Antonio; Roset Juan, Francesc Xavier; Aguzzi, Jacopo; Sardà, Francesc (2009)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A tracking system with RFID technology has been developed to measure the activity and behaviour of species in laboratory. It consists of different controllers which handle different RFID antennas. The controllers send the ...

    • A novel approach to MISO interference networks under maximum receive-power regulation 

      Pérez Neira, Ana Isabel; Vázquez Oliver, Miguel Ángel; Lagunas Hernandez, Miguel A. (WSEAS Press, 2018-07-01)
      Article
      Accés obert
      An aggressive frequency reuse is expected within the next years in order to increase the spectral ef¿ciency. Multiuser interference by all in-band transmitters can create a communication bottleneck and, therefore, it is ...

    • A novel RFI detection method for microwave radiometers using multilag correlators 

      Díez García, Raúl; Camps Carmona, Adriano José (Institute of Electrical and Electronics Engineers (IEEE), 2021-02-10)
      Article
      Accés obert
      Radio frequency interference (RFI) is an increasing problem in microwave radiometry, particularly for Earth observation, because the antennas are pointing toward the Earth. RFI has been observed at the L-band in European ...

    • A novel tunable multimodal bandpass filter 

      Contreras Lizarraga, Adrián Arturo; Pradell i Cara, Lluís; Ribó, M. (2011)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents a novel uniplanar tunable bandpass filter. In this filter, each resonator can be reconfigured easily using PIN diodes or MEMS switches. Design equations are derived from a simple circuit model which ...

    • A recursive digital predistorter for linearizing RF power amplifiers with memory effects 

      Gilabert Pinal, Pere Lluís; Montoro López, Gabriel; Cesari Bohigas, Albert (2006-12)
      Comunicació de congrés
      Accés obert
      A nonlinear auto-regressive moving average (ARMA) structure capable of compensating nonlinear memory effects in RF power amplifiers is here presented. Results on the linearity improvement, in both in-band and out-of-band ...

    • A RF generator based on a FPGA system 

      Puertas Molina, Eduard (Universitat Politècnica de Catalunya, 2014-03-06)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Beijing hang kong hang tian da xue
      [ANGLÈS] This work is part of ongoing research conducted at Beihang University relating to signal generating. The primary objective of this thesis was to develop a flexible, high-performance Radio Frequency (RF) generator ...

    • A RF-MEMS switchable CPW air-bridge 

      Contreras, Adrián; Casals Terré, Jasmina; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina; Iannacci, Jacopo; Ribó, Miquel (2012)
      Comunicació de congrés
      Accés obert
      This work presents a new shunt-type ohmic contact RF-MEMS switch specifically designed as a switchable CPW air bridge. The switch can be used in coplanar waveguide (CPW) reconfigurable multimodal circuits, for a selective ...

    • A transient model for RF cavity analysis under beam loading 

      Hassanzadegan, Hooman; Griñó Cubero, Robert (2010-04)
      Article
      Accés restringit per política de l'editorial
      There are two important considerations in the development of an electrical model for RF cavities to be used for system analysis or LLRF loop design, being: transient response and cavity impedance mismatch. In the literature, ...

    • A vector approach for noise parameter fitting and selection of source admittances 

      O'Callaghan Castellà, Juan Manuel; Mondal, J. P. (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1991-08-31)
      Article
      Accés obert
      Simple 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 wideband detector for the 30 Ghz channel of the Planck mission low frequency instrument 

      Paco Sánchez, Pedro Antonio de; Lázaro Guillén, Antoni; Pradell i Cara, Lluís (GORDON BREACH SCI PUBL LTD, 2000-05-31)
      Article
      Accés obert
      Design considerations of a 30 GHz detector prototype for the Planck Low Frequency Instrument (LFI) are presented. A simple detector configuration based on a commercial Schottky diode is used, featuring a good linearity and ...