Exploració per tema "Radio frequency"

Ara es mostren els items 1-20 de 193

    • 5G multi-antenna vehicle scattering characterization 

      Dumre, Kushal (Universitat Politècnica de Catalunya, 2019-06-20)
      Projecte Final de Màster Oficial
      Accés obert
      In today's era of internet, everything is tending to be intelligent enough to be managed by itself. Following the same line, vehicles are more than vehicular machines. They are tending to be autonomously driven, able to ...

    • A battery-less, self-sustaining RF energy harvesting circuit with TFETs for µW power applications 

      Nunes Cavalheiro, David Manuel; Moll Echeto, Francisco de Borja; Valtchev, Stanimir (Institute of Electrical and Electronics Engineers (IEEE), 2016)
      Text en actes de congrés
      Accés obert
      This paper proposes a Tunnel FET (TFET) power management circuit for RF energy harvesting applications. In contrast with conventional MOSFET technologies, the improved electrical characteristics of TFETs promise a better ...

    • 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 compact noise model for carbon nanotube FETs 

      Landauer, Gerhard Martin; González Jiménez, José Luis (Institute of Electrical and Electronics Engineers (IEEE), 2012)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper focuses on the development of a compact noise model for radiofrequency (RF) carbon nanotube field-effect transistors (CNFET). The noise mechanisms in these devices are discussed and the impact of the different ...

    • 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 High-Efficiency RF Harvester with Maximum Power Point Tracking 

      Gasulla Forner, Manuel; Robert Sanxis, Francesc Josep; Jordana Barnils, José; Ripoll Vercellone, Edgar; Berenguer Sau, Jordi; Reverter Cubarsí, Ferran (Multidisciplinary Digital Publishing Institute (MDPI), 2018)
      Text en actes de congrés
      Accés obert
      This paper presents the implementation of a high-efficiency radiofrequency (RF) harvester, which consists of a rectenna and a maximum power point tracker (MPPT). The rectenna was characterized from -30 dBm to -10 dBm at ...

    • A low-power RF front-end for 2.5 GHz receivers 

      Moreno Boronat, Lidia Ana; Gómez, D; González Jiménez, José Luis; Mateo Peña, Diego; Aragonès Cervera, Xavier; Berenguer, R; Solar, H (Institute of Electrical and Electronics Engineers (IEEE), 2008)
      Text en actes de congrés
      Accés obert
      This paper presents a low power and low cost front end for a direct conversion 2.5 GHz ISM band receiver composed of a 16 kV HBM ESD protected LNA, differential Gilbert-cell mixers, and high-pass filters for DC offset ...

    • 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 reconstruction algorithm for the improvement of SMOS brightness temperatures 

      González Gambau, Veronica; Turiel, Antonio; Martinez, Justino; Olmedo, Edson; Corbella Sanahuja, Ignasi (Institute of Electrical and Electronics Engineers (IEEE), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      RFI (Radio Frequency Interference) sources, Sun signal and even land-sea transitions may generate large sidelobes that corrupt SMOS brightness temperature products and therefore, the quality of the soil moisture and sea ...

    • A review of RFI mitigation techniques in microwave radiometry 

      Querol, Jorge; Pérez Portero, Adrián; Camps Carmona, Adriano José (Multidisciplinary Digital Publishing Institute (MDPI), 2019-12-17)
      Article
      Accés obert
      Radio frequency interference (RFI) is a well-known problem in microwave radiometry (MWR). Any undesired signal overlapping the MWR protected frequency bands introduces a bias in the measurements, which can corrupt the ...

    • 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, ...

    • Absorptive frequency selective limiter for multiplexers 

      Hueltes Escobar, Alberto (Universitat Politècnica de Catalunya, 2012-07-05)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      RF & Microwave Receivers are used to detect low level signals. Therefore require high gain and low noise sensitive circuits at the input. These circuits (most of all LNA) are often susceptible to damage if exposed to ...

    • Actualización, adaptación y evolución del sistema de automedidas de receptores analógicos de TV 

      Domínguez González, Raúl (Universitat Politècnica de Catalunya, 2016-08)
      Projecte/Treball Final de Carrera
      Accés obert
      Realitzat a/amb:   Sony
      El proyecto consiste en la elaboración de un programa en entorno LabView para realizar medidas automáticas de sintonizadores de TV para la empresa Sony. Partimos de un programa básico de medidas semi-automáticas con la ...

    • Adjustment of Xia - Bertoni's propagation model for planning urban mobile environments through campaign results measurement 

      Deitx Roca, Ferran (Universitat Politècnica de Catalunya, 2010-07-23)
      Projecte Final de Màster Oficial
      Accés obert

    • Aging in CMOS RF linear power amplifiers: an experimental study 

      Aragonès Cervera, Xavier; Barajas Ojeda, Enrique; Crespo Yepes, Albert; Mateo Peña, Diego; Rodríguez Martínez, Rosana; Martin Martínez, Javier; Nafría Maqueda, Montserrat (IEEE Microwave Theory and Techniques Society, 2021-02-01)
      Article
      Accés obert
      An extensive experimental analysis of the hot carrier injection (HCI) and bias temperature instability (BTI) aging effects on RF linear power amplifiers (PAs) is presented in this article. Two different 2.45-GHz PA topologies ...

    • An in-band frequency agility modem imlemented with a DSP device 

      Dalmau, J; Delgado, J; Serrat Fernández, Juan; Valle Alarcón, Rafael (Institute of Electrical and Electronics Engineers (IEEE), 1989)
      Text en actes de congrés
      Accés obert
      The authors present a modem with in-band frequency agility that has been implemented with the TMS 32010 signal processor. A strategy based on embedded real-time channel estimation (RTCE) has been adopted to manage the ...

    • An interference analysis on cellular mobile radiocommunications using CAD/CAE techniques 

      Marti, Javier; Cardona, Narcís; Ferrando Bataller, Miquel (Institute of Electrical and Electronics Engineers (IEEE), 1992)
      Comunicació de congrés
      Accés obert
      The cochannel interference in a base-station's receiver of one cell produced by a mobile in another cell that uses the same frequency is studied. An OMNISYS simulation model of channel-plus-receiver is proposed and used ...

    • Analysis of optical communications in the O3b satellite constellation 

      Ramírez Romero, Marc (Universitat Politècnica de Catalunya, 2024-05-13)
      Treball Final de Grau
      Accés obert
      Satellite communications are of great importance in providing, for example, access to the Internet for a large part of the population. These communications are based on radio frequency links. In recent years, however, given ...