Now showing items 1-20 of 33

  • A computational multiscale homogenization framework accounting for inertial effects: application to acoustic metamaterials modelling 

    Roca Cazorla, David; Lloberas Valls, Oriol; Cante Terán, Juan Carlos; Oliver Olivella, Xavier (2018-03)
    Article
    Open Access
    A framework, based on an extended Hill–Mandel principle accounting for inertial effects (Multiscale Virtual Work principle), is developed for application to acoustic problems in the context of metamaterials modelling. The ...
  • Al2O3/TiO2 inverse opals from electrosprayed self-assembled templates 

    Coll, Arnau; Bermejo Broto, Sandra; Hernández, David; Castañer Muñoz, Luis María (2018-01-19)
    Article
    Open Access
    The fabrication of high optical quality inverse opals is challenging, requiring large size, three-dimensional ordered layers of high dielectric constant ratio. In this article, alumina/TiO2–air inverse opals with a 98.2% ...
  • Analysis of PIFA antenna coupling in nearby traces and reduction with CSRRs in PCB at 2.45 GHz 

    Gil Galí, Ignacio; Fernández García, Raúl (Institute of Electrical and Electronics Engineers (IEEE), 2015)
    Conference report
    Open Access
    The electromagnetic coupling of a conventional planar inverted-F antenna (PIFA) antenna in the nearby layout traces is investigated in the 2.45 GHz industrial, scientific and medical radio band. The impact of a complementary ...
  • A simple and effective microwave invisibility cloak based on frequency selective surfaces 

    Yuste, Pedro; Rius Casals, Juan Manuel; Romeu Robert, Jordi; Blanch Boris, Sebastián; Heldring, Alexander; Úbeda Farré, Eduard (Institute of Electrical and Electronics Engineers (IEEE), 2017)
    Conference lecture
    Open Access
    This paper presents the design, simulation, manufacturing and testing of a simple invisibility cloak based on a frequency selective surface (FSS). The work is focused on cloaking an electrically thin dielectric cylinder ...
  • Characterization and modelling of switchable stop-band filters based on RF-MEMS and complementary split ring resonators 

    Gil Galí, Ignacio; Morata Cariñena, Marta; Fernández García, Raúl; Rottenberg, Xavier; De Raedt, Walter (2010-08-13)
    Article
    Open Access
    In this work, we present the characterization and electrical modelling of a reconfigurable stop-band filter based on RF microelectromechanical systems (RF-MEMS) combined with metamaterial structures. The device consists ...
  • Characterization of EMI filters based on metamaterials 

    Gil Galí, Ignacio; Fernández García, Raúl; Vives, Yolanda; Jauregui Tellería, Ricardo; Silva Martínez, Fernando (2009-06)
    Conference lecture
    Open Access
    This paper analyzes the behavior of EMI filters based on metamaterials. The filters are developed by means of sub-wavelength resonators and designed to have notch-type attenuation in the 2.45 GHz band. Two types of filters ...
  • Computational design of locally resonant acoustic metamaterials 

    Roca Cazorla, David; Yago Llamas, Daniel; Cante Terán, Juan Carlos; Lloberas Valls, Oriol; Oliver Olivella, Xavier (2019-03)
    Article
    Restricted access - publisher's policy
    The so-called Locally Resonant Acoustic Metamaterials (LRAM) are considered for the design of specifically engineered devices capable of stopping waves from propagating in certain frequency regions (bandgaps), this making ...
  • Computational material design for acoustic cloaking 

    Méndez, Carlos Alberto; Podestá, J.M.; Lloberas Valls, Oriol; Toro, Sebastian; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier (John Wiley & Sons, 2017-12)
    Article
    Open Access
    A topology optimization technique based on the topological derivative and the level set function is utilized to design/synthesize the micro-structure of a pentamode material for an acoustic cloaking device. The technique ...
  • Computing and communications for the software-defined metamaterial paradigm: a context analysis 

    Abadal Cavallé, Sergi; Liaskos, Christos; Tsioliaridou, Ageliki; Ioannidis, Sotiris; Pitsillides, Andreas; Solé Pareta, Josep; Alarcón Gallo, Eduardo; Cabellos Aparicio, Alberto (Institute of Electrical and Electronics Engineers (IEEE), 2017-01-01)
    Article
    Open Access
    Metamaterials are artificial structures that have recently enabled the realization of novel electromagnetic components with engineered and even unnatural functionalities. Existing metamaterials are specifically designed ...
  • Differential and common-mode filters based on metamaterial resonators 

    Gil Galí, Ignacio; Fernández García, Raúl (2013)
    Conference lecture
    Open Access
    Two different techniques based on metamaterials for mitigating both the differential and common-mode propagation in differential signaling are addressed. The proposed filters are implemented by means of complementary ...
  • Differential- and common-mode radiofrequency interference filters based on complementary split ring resonators: a conduction and radiation impact analysis 

    Gil Galí, Ignacio; Fernández García, Raúl (2015-01-22)
    Article
    Open Access
    This paper aims to analyse the design techniques of differential transmission lines loaded with metamaterials. Specifically, complementary split-ring resonators were etched on the ground plane of a microstrip transmission ...
  • Diseño de celdas metamateriales usando tecnología monolítica multicapas 

    Cassany Viladomat, David (Universitat Politècnica de Catalunya, 2010)
    Master thesis (pre-Bologna period)
    Open Access
    Castellano: En este trabajo se estudia e investiga el diseño de celdas metamateriales en un sustrato multicapa monolítico, tal y como ya sugiere el título. El objetivo es usar un sustrato con Benzocyclbutene (BCB) como ...
  • Diseño de filtros modo común para sistemas balanceados basados en metamateriales 

    Pachón Muñoz, Arturo (Universitat Politècnica de Catalunya, 2010)
    Master thesis (pre-Bologna period)
    Open Access
    Los actuales servcios de radiofrecuencia presentan una mayor dificultad, desde el punto de vista de compatibilidad electromagnética, debido a la necesidad de compactarlos lo máximo posible. Para mitigar los efectos que ...
  • Embroidered metamaterial antenna for optimized performance on wearable applications 

    Gil Galí, Ignacio; Seager, Rob; Fernández García, Raúl (2018-08-16)
    Article
    Restricted access - publisher's policy
    In this work, an embroidered metamaterial monopole antenna based on a split ring resonator electromagnetic bandgap shielding structure is designed, simulated, and tested. This work investigates the impact of different types ...
  • E-Textile embroidered metamaterial transmission line for signal propagation control 

    Moradi, Bahareh; Fernández García, Raúl; Gil Galí, Ignacio (2018-06-05)
    Article
    Open Access
    In this paper, the utilization of common fabrics for the manufacturing of e-textile metamaterial transmission lines is investigated. In order to filter and control the signal propagation in the ultra-high frequency (UHF) ...
  • Flat lensing by periodic loss-modulated materials 

    Pradeep Kumar, Nikhil; Herrero Simon, Ramon; Botey Cumella, Muriel; Staliunas, Kestutis (2013-09-23)
    Article
    Open Access
    We propose a flat lensing effect using a periodic loss-modulated material. In particular, we consider a two-dimensional square and rhombic arrangement of lossy cylinders embedded in a host media with the same refractive ...
  • Frequency and bandwidth control of switchable microstrip bandpass filters using RF-MEMS ohmic switches 

    Brito Brito, Zabdiel; Llamas, Ignacio; Pradell i Cara, Lluís; Giacomozzi, Flavio; Colpo, Sabrina (2013)
    Conference report
    Restricted access - publisher's policy
    In this paper a reconfigurable bandpass filter is designed using ohmic-contact cantilever-type Micro Electro Mechanical Systems (MEMS) switches., Tthe filter can switch between two different states with a center frequency ...
  • Hybrid modulator for power converters in parallel topology 

    Mon González, Juan; González Díez, David; Balcells Sendra, Josep; Gago Barrio, Javier; Bogónez Franco, Francisco (2012)
    Conference lecture
    Open Access
    This paper presents a new mixed modulator that combines interleaving and spread-spectrum techniques in order to achieve the lowest level of conducted EMI generation. This modulator is addressed to power converters in ...
  • Liquid crystal hyperbolic metamaterial for wide-angle negative-positive refraction and reflection 

    Pawlik, Grzegorz; Tarnowski, Karol; Walasik, Wiktor; Mitus, Antoni C.; Khoo, Lamchoon (2014-04-01)
    Article
    Open Access
    We show that nanosphere dispersed liquid crystal (NDLC) metamaterial can be characterized in near IR spectral region as an indefinite medium whose real parts of effective ordinary and extraordinary permittivities are ...
  • Material design of elastic structures using Voronoi cells 

    Podestá, J.M.; Méndez, C. G.; Toro, S.; Huespe, Alfredo Edmundo; Oliver Olivella, Xavier (John Wiley & sons, 2018-07)
    Article
    Restricted access - publisher's policy
    New tools for the design of metamaterials with periodic microarchitectures are presented. Initially, a two-scale material design approach is adopted. At the structure scale, the material effective properties and their ...