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Ara es mostren els items 133-146 de 146

    • S-parameter measurement of chip Ga As FETs up to 22 GHz using the TRL calibration technique 

      Pradell i Cara, Lluís; Artal, E; Sabater, C (Institute of Electrical and Electronics Engineers (IEEE), 1989)
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      In this paper, the design of a Microstrip Test Fixture for TRL calibration is described. Experimental results for S-parameters measurement of a GaAs FET chip in the 3-22 GHz frequency range are presented. Repeatability of ...

    • Sistema de medida de parametros de ruido de transitores chip en banda Ka 

      Pradell i Cara, Lluís (1991)
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      In this paper a full noise paramerers measuremenr sysrem is presenred for chip transistors clwracrerizarion in Ka band. The hardware involved is described jocusing in the elements indeed designed. Some accurate S-paramerers ...

    • Sistema de medida de paráemtros de ruido con generación automática de configuraciones de impedancia de fuente 

      Pradell i Cara, Lluís; Fauna, G; O'Callaghan Castellà, Juan Manuel; Lázaro Guillén, Antoni (1996)
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    • Sistema de medida de parámetros de ruido con generación automática de configuración de impedancia de fuente 

      Pradell i Cara, Lluís; FAURA, G; O'Callaghan Castellà, Juan Manuel; Lázaro Guillén, Antoni (J.M. PÁEZ BORRALLO, J.I. ALONSO MONTES SERVICIO PUBLICACIONES ETSIT - MADRID, 1996)
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    • Study of intermodulation in RF MEMS variable capacitors 

      Girbau Sala, David; Otegi Urdanpilleta, Nerea; Pradell i Cara, Lluís; Lázaro Guillén, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-03-31)
      Article
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      This paper provides a rigorous study of the causes and physical origins of intermodulation distortion (IMD) in RF microelectromechanical systems (MEMS) capacitors, its analytical dependence on the MEMS device design ...

    • TRL calibration applied to the measurement of chip transistor s-parameters up to 40 ghz 

      Pradell i Cara, Lluís; Sabater, C.; Artal, Eduardo; Comerón Tejero, Adolfo; Bará Temes, Francisco Javier; Corbella Sanahuja, Ignasi; Fortuny, J. (Institute of Electrical and Electronics Engineers (IEEE), 1990)
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    • Tunable dual-band filters based on capacitive-loaded stepped-impedance resonators 

      Girbau Sala, David; Lázaro Guillén, Antoni; Pérez, A.; Martínez, Ester; Pradell i Cara, Lluís; Villarino Villarino, Ramón (2009)
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      This paper proposes the design of tunable dual-band filters for multi-band multi-standard systems. The main objective is to provide frequency tunability in the second band while maintaining the first band fixed. To this ...

    • Tunable dual-band resonators for communication systems 

      Girbau Sala, David; Lázaro Guillén, Antoni; Obiols Pérez, Alberto; Martínez, Ester; Pradell i Cara, Lluís; Villarino Villarino, Ramón (2010-06-01)
      Article
      Accés restringit per política de l'editorial
      This paper proposes the design of tunable dual-band resonators for multi-band multi-standard systems. The main objective is to provide frequency tunability in the second resonance while maintaining the first resonance ...

    • U-Band micromachined coaxial filter 

      Jaimes Vera, Edith Aline; Llamas Garro, Ignacio; Ke, Maolong; Wang, Yi; Lancaster, Michael J.; Pradell i Cara, Lluís (IEEE, 2011)
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      This paper presents a micromachined filter for millimeter-wave applications operating at U-band. The structure was designed using a rectangular coaxial line with the center conductor suspended in air. The rectangular coaxial ...

    • UMTS-WiFi switchable bandpass filter 

      Brito Brito, Zabdiel; Llamas Garro, Ignacio; Navarro Muñoz, Guillem; Perruisseau Carrier, Julien; Pradell i Cara, Lluís (2009)
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      In this paper a reconfigurable bandpass filter able to switch between WiFi and UMTS transmit band standards is presented. The filter is designed in such a way that center frequency and bandwidth specifications are precisely ...

    • Unidad externa para una estación terrena del experimento CODE 

      Corbella Sanahuja, Ignasi; Bará Temes, Francisco Javier; Pradell i Cara, Lluís; Fortuny Guasch, Joaquim (1991)
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      In this paper, the design of an outdoor unit for aCODE earth station is presented. CODE is a communications experiment that uses satellite Olympus to link several user stations vi a a hub station in a star configuration . ...

    • Uniplanar bandpass filters based on multimodal immitance inverters and end-coupled slotline resonators 

      Contreras Lizarraga, Adrián Arturo; Ribó, Miquel; Pradell i Cara, Lluís; Blondy, Pierre (IEEE Microwave Theory and Techniques Society, 2013)
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      This paper presents the design and implementation of uniplanar bandpass filters that use end-coupled slotline resonators and a new kind of multimodal immitance inverter. These inverters are based on an asymmetric ...

    • Very Low-Noise Differential Radiometer at 30 GHz for the PLANCK LFI 

      Aja, Beatriz; Artal Latorre, Eduardo; Fuente, Luisa de la; Pascual, Juan Pablo; Mediavilla, Asier; Roddis, Neil; Kettle, Danielle; Winder, W. Frank; Pradell i Cara, Lluís; Paco Sánchez, Pedro Antonio de (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2005-06-30)
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      The PLANCK mission of the European Space Agency is devoted to produce sky maps of the cosmic microwave background radiation. The low-frequency instrument is a wide-band cryogenic microwave radiometer array operating at 30, ...

    • X-parameters based characterization of PIN diodes for reconfigurable antenna assessment 

      Ramírez Arroyave, Germán Augusto; Barlabe Dalmau, Antoni; Pradell i Cara, Lluís; Jofre Roca, Lluís (Íñigo Cuiñas Gómez, 2021)
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      This contribution presents the non-linear characterization up to 50 GHz of a PIN diode commonly used as switch for reconfigurable devices at microwave applications. Non-linear models are extracted by means of X-parameter ...