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Ara es mostren els items 126-145 de 146

    • Reconfigurable multimodal bandpass filter based on RF-MEMS switchable CPW air-bridges 

      Contreras Bleda, Adrián; Casals Terré, Jasmina; Pradell i Cara, Lluís; Giacomozzi, Flavio; Iannacci, Jacopo; Ribó i Pal, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 2013)
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      In this paper, a uniplanar RF-MEMS secondorder bandpass filter with reconfigurable centre frequency is presented. It is based on quarter-wavelength slotline resonators and CPW-slotline multimodal immittance inverters (MIIs), ...

    • Reconfigurable uniplanar bandpass filter based on RF-MEMS switched capacitors 

      Contreras, Adrián; Pradell i Cara, Lluís; Casals Terré, Jasmina; Giacomozzi, Flavio; Iannacci, Jacopo; Ribó, Miquel (2013)
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      In this paper, an uniplanar RF-MEMS second-order bandpass filter with reconfigurable centre frequency is presented. It is based on half-wavelength slotline resonators, which are loaded using RF-MEMS switches connected ...

    • Reduced-length uniplanar bandpass filters based on coplanar-waveguide-slotline tees 

      Contreras Lizarraga, Adrián Arturo; Pradell i Cara, Lluís; Ribó i Pal, Miquel; Blondy, Pierre (Institute of Electrical and Electronics Engineers (IEEE), 2015)
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      This paper presents the design and implementation of multimodal uniplanar bandpass filters which use loaded coplanar-waveguide-slotline tees in the slotline resonators to reduce the filter length. The tees are theoretically ...

    • RF-MEMS switches designed for high-performance uniplanar microwave and mm-wave circuits 

      Pradell i Cara, Lluís; Girbau Sala, David; Ribó Pal, Miquel; Casals Terré, Jasmina; Lázaro Guillén, Antonio; Contreras Lizárraga, Adrián; Llamas Morote, Marco Antonio; Heredia Vega, Julio César; Giacomozzi, Flavio; Margesin, Benno (IntechOpen, 2018-07-18)
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      Radio frequency microelectromechanical system (RF-MEMS) switches have demonstrated superior electrical performance (lower loss and higher isolation) compared to semiconductor-based devices to implement reconigurable microwave ...

    • RF-MEMS switches for a full control of the propagating modes in uniplanar microwave circuits and their application to reconfigurable multimodal microwave filters 

      Contreras Lizarraga, Adrián Arturo; Casals Terré, Jasmina; Pradell i Cara, Lluís; Ribó i Pal, Miquel; Heredia Vega, Julio César; Giacomozzi, Flavio; Margesin, Benno (2017-03-29)
      Article
      Accés obert
      In this paper, new RF-MEMS switch configurations are proposed to enable control of the propagating (even and odd) modes in multimodal CPW transmission structures. Specifically, a switchable air bridge (a switchable ...

    • RF-MEMS uniplanar 180° phase switch based on a multimodal air-bridged CPW cross 

      Llamas Morote, Marco Antonio; Girbau Sala, David; Ribó, M.; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, S (2011-07)
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      Accés restringit per política de l'editorial
      In this paper, a new compact broadband uniplanar 180 phase switch, based on an air-bridged coplanar-waveguide (CPW) cross loaded with two capacitive-contact microelectromechancial systems (MEMS) switches in opposed (ON/OFF) ...

    • RF-MEMS uniplanar 180º Phase Switch based on switching between two out-of-phase paths 

      Llamas Morote, Marco Antonio; Pradell i Cara, Lluís; Girbau Sala, David; Ribó, Miquel; Lázaro Villa, José Antonio; Giacomozzi, Flavio; Margesin, Benno (2011)
      Article
      Accés restringit per política de l'editorial
      A phase switch based on switching between two twoport passive networks with a phase difference of 180º is reported. Two RF MEMS single-pole-double-throw structures are used to select the phase path. The fabrication is ...

    • 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
      Accés obert
      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)
      Article
      Accés restringit per política de l'editorial
      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)
      Article
      Accés obert
      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, ...