Browsing by Subject "Ones electromagnètiques"

Now showing items 1-20 of 105

    • 5G Evaluation platform for connected and autonomous vehicles 

      Romero Garrido, Alejandro (Universitat Politècnica de Catalunya, 2021-10-25)
      Bachelor thesis
      Open Access
      La nueva generación de comunicaciones móviles, es decir, 5G, promete una capacidad sin precedentes, vínculos y flexibilidad para admitir una amplia variedad de casos de uso. Se espera que la mejora en rendimiento en términos ...

    • A high-performance electromagnetic vibration energy harvester based on ring magnets with Halbach configuration 

      Ordóñez Izquierdo, Víctor Hugo; Arcos Villamarín, Robert; Romeu Garbí, Jordi (Elsevier, 2022-12-01)
      Article
      Open Access
      This paper proposes and studies a ring-shaped architecture with Halbach configuration for electromagnetic vibration energy harvesters. The proposed transducer consists of three ring magnets with a linear Halbach array that ...

    • A procedure to design wide-band electromagnetically-coupled stacked microstrip antennas based on a simple network model 

      Anguera Pros, Jaume; Puente Baliarda, Carles; Borja, C. (Institute of Electrical and Electronics Engineers (IEEE), 1999)
      Conference report
      Restricted access - publisher's policy
      It is well known that microstrip patch antennas have a poor bandwidth due to the small spacing between the patch and the ground plane. A stacked patch configuration has been demonstrated experimentally as a feasible solution, ...

    • ABSense: sensing electromagnetic waves on metasurfaces via ambient compilation of full absorption 

      Liaskos, Christos; Pyrialakos, Georgios; Pitilakis, Alexandros; Abadal Cavallé, Sergi; Tsioliaridou, Ageliki; Tasolamprou, Anna; Tsilipakos, Odysseas; Kantartzis, Nikolaos V.; Ioannidis, Sotiris; Alarcón Cot, Eduardo José; Cabellos Aparicio, Alberto; Kafesaki, Maria; Pitsillides, Andreas; Kossifos, Kypros; Georgiou, Julius; Akyildiz, Ian (Association for Computing Machinery (ACM), 2019)
      Conference report
      Open Access
      Metasurfaces (MS) constitute effective media for manipulating and transforming impinging EM waves. Related studies have explored a series of impactful MS capabilities and applications in areas such as wireless communications, ...

    • Active control of Alfvén eigenmodes inmagnetically confined toroidal plasmas 

      Garcia Muñoz, Manuel; Shaparov, Sergei; Zeeland, Michael A, Van; Ascasibar, Enrique; Cappa, Álvaro; Chen, L; Ferreira, J; Galdon Quiroga, Joaquin; Geiger, Benedikt; González Martin, J; Heidbrink, William W.; Johnson, T; Lauber, Phillipp; Mantsinen, Mervi; Melkinov, Alexander; Nabais, F; Rivero Rodríguez, Juan Francisco; Sanchis Sanchez, Lucía; Schneider, P; Stober, Jörg; Suttrop, Wolfgang; Todo, Yasushi; Vallejos, Pablo; Zonca, Fulvio; AUG and MST1 Teams (IOP Publishing, 2019-03)
      Article
      Open Access
      Alfvén waves are electromagnetic perturbations inherent to magnetized plasmas that can be driven unstable by a free energy associated with gradients in the energetic particles' distribution function. The energetic particles ...

    • Aliasing of the Schumann resonance background signal by sprite-associated Q-bursts 

      Guha, Anirban; Williams, Earle R.; Boldi, Robert; Satori, Gabriella; Nagy, Tamás; Bór, József; Montañá Puig, Juan; Ortega, Pascal (2017-12)
      Article
      Open Access
      The Earth's naturally occurring Schumann resonances (SR) are composed of a quasi-continuous background component and a larger-amplitude, short-duration transient component, otherwise called ‘Q-burst’ (Ogawa et al., 1967). ...

    • Anomalies study in VTEC from SMOS data 

      Roura Garcés, Sergi (Universitat Politècnica de Catalunya, 2023-07-06)
      Bachelor thesis
      Open Access
      The main goal is to analyze the SMOS measurements and determine if there is any sign on them that could determine the possible effects of these natural phenomena on the ionosphere.

    • BEXUS30 – ELFI: Measuring Schumann resonances in the atmosphere 

      Jelonek, Jonas; Stephan, Jonas; Bochmann, David; Gebken, Lars (Universitat Politècnica de Catalunya, 2022-04-29)
      Conference lecture
      Open Access
      The ELFI project was one of nine BEXUS experiments carried in two stratospheric balloons in 2021. The aim of the experiment was to develop a system for the non-stationary measurement of electromagnetic waves in the extremely ...

    • Caracterització optoelectrònica del grafè a altes freqüències i anàlisi dels efectes produïts en el grafè degut a diferents substrats 

      Gabriel Cortes, Daniel (Universitat Politècnica de Catalunya, 2015-07-22)
      Master thesis (pre-Bologna period)
      Open Access
      This project represents the continuation of the previous study about the analysis graphene optical and electronic properties over a wide frequency range: terahertz, near-infrared, visible band and near-ultraviolet. In this ...

    • Compression of the MoM matrix using macrobasis functions with a full-controlable accuracy 

      Tamayo Palau, José María; Heldring, Alexander; Rius Casals, Juan Manuel (EurAPP, 2009)
      Conference report
      Open Access
      A new accuracy-controlable method for compressing the MoM impedance matrix of an electromagnetic problem based on a basis change plus a truncation with a threshold is presented here. The idea is to switch to singular basis ...

    • Computational Techniques for LED Optical Microcavities 

      García Santiago, Xavier (Universitat Politècnica de Catalunya, 2015-06-03)
      Master thesis (pre-Bologna period)
      Restricted access - confidentiality agreement

    • COMSOL Simulation for Adaptive Massive MIMO Systems in the Terahertz Band 

      Rul·lan Palou De Comasema, Francisco (Universitat Politècnica de Catalunya, 2014-12-19)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   Georgia Institute of Technology
      [ANGLÈS] The communications in the Terahertz Band (0.06-10 THz) are a promising new paradigm for wireless communications in the next decade. Their large available bandwidth, combined with the development of graphene antennas, ...

    • Contact-Free Measurement of Cardiac and Respiratory Activities by Using Thermal Imaging 

      Vilà Calopa, Chantal (Universitat Politècnica de Catalunya, 2014-04-15)
      Master thesis (pre-Bologna period)
      Open Access
      Covenantee:   Rheinisch-Westfälische Technische Hochschule Aachen
      [ANGLÈS] Motivation: Real time measurements of respiratory and heart rates are crucial in neonatal intensive care units. The actual technology is based on contact methods that require close-proximity sensing and subject’s ...

    • Cylindrical geometry: a further step in active microwave tomography 

      Broquetas Ibars, Antoni; Jofre Roca, Lluís; Cardama Aznar, Ángel; Elias Fusté, Antoni; Rius Casals, Juan Manuel; Romeu Robert, Jordi (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1991-05-01)
      Article
      Open Access
      A prototype imaging system for active microwave tomography using cylindrical geometry has been developed, making it possible to obtain images of the dielectric properties of biological targets at 2.45 GHz. This configuration ...

    • Database of "in vivo" measurements for quantitative microwave imaging and reconstruction algorithms available 

      Mallorquí Franquet, Jordi Joan; Joachimowicz, N.; Bolomey, J. C. (Jean-Charles); Broquetas Ibars, Antoni (IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 1995-10-01)
      Article
      Open Access
      Reconstruction algorithms and equipment have been developed for microwave imaging, with emphasis on noninvasive control of deep hyperthermia treatments. Tomographic reconstruction algorithms have also been developed for ...

    • Debye frequency-extended waveguide permittivity extraction for high complex permittivity materials. Concrete setting process characterization 

      Gonzalez, Giselle; Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís (2019-12)
      Article
      Open Access
      A waveguide with central frequency 868 MHz is used in transmission/reflection operation regime to accurately measure the behaviour of the complex permittivity of high complex permittivity granular materials and it has been ...

    • Desarrollo de un cabezal de microondas para a detección de frecuencia Doppler 

      Rubino, Roselena (Universitat Politècnica de Catalunya, 2010-10)
      Master thesis (pre-Bologna period)
      Open Access
      Este proyecto tiene como finalidad realizar un prototipo de un radar implementado como un cabezal de microondas que pueda detectar frecuencia Doppler a 10,525 GHz en una placa de Microstrip con un sustrato de la empresa ...

    • Design of a leaky-wave antenna based on Goubau line for imaging applications 

      Bock Filella, Roger (Universitat Politècnica de Catalunya, 2022-07-05)
      Bachelor thesis
      Open Access
      En ingeniería de antenas, uno de los aspectos más apreciados es la capacidad de apuntar el haz principal electrónicamente. Una de las técnicas más ampliamente usadas para conseguirlo es el escaneo mediante agrupaciones de ...

    • Detección por microondas de una única micropartícula 

      Rodriguez Gargallo, Marta (Universitat Politècnica de Catalunya, 2021-07-08)
      Bachelor thesis
      Open Access
      Project carried out at the MicroCommFlow Lab which is a group specialized in interaction with microorganisms. We need to interact with the living world and most of the time this is done applying some kind of physical ...

    • Diagnóstico de arrays. Estudio comparativo entre campo próximo rectangular y cilíndrico 

      Blanch Boris, Sebastián; Romeu Robert, Jordi; Jofre Roca, Lluís (Unión Científica Internacional de Radio (URSI), 1990)
      Conference report
      Open Access