Exploració per tema "Metamaterials"
Ara es mostren els items 1-20 de 81
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A computational multiscale homogenization framework accounting for inertial effects: application to acoustic metamaterials modelling
(2018-03)
Article
Accés obertA 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 ... -
A simple and effective microwave invisibility cloak based on frequency selective surfaces
(Institute of Electrical and Electronics Engineers (IEEE), 2017)
Comunicació de congrés
Accés obertThis 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 ... -
ABSense: sensing electromagnetic waves on metasurfaces via ambient compilation of full absorption
(Association for Computing Machinery (ACM), 2019)
Text en actes de congrés
Accés obertMetasurfaces (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, ... -
Acoustic metamaterials with controllable transmission: from complete sound attenuation to a transparent state
(Universitat Politècnica de Catalunya, 2020-04-24)
Projecte Final de Màster Oficial
Accés restringit per decisió de l'autor
Realitzat a/amb: Rijksuniversiteit GroningenThis project deals with the design and analysis of sound scattering in acoustic metamaterials with the aim to realize a controllable transmission response. First, a so-called stealth acoustic metamaterial is studied. This ... -
Al2O3/TiO2 inverse opals from electrosprayed self-assembled templates
(2018-01-19)
Article
Accés obertThe 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% ... -
All-dielectric self-cloaked structures
(2018-03-17)
Article
Accés obertA general procedure to design objects that are intrinsically invisible (without the necessity of an external cloak) has not been demonstrated so far. Here we propose a flexible method to design such self-cloaked objects ... -
An equivalent lattice-modified model of interfering Bragg bandgaps and Locally Resonant Stop Bands for phononic crystal made from Locally Resonant elements
(2023-08-01)
Article
Accés obertThe design and development of advanced devices based on metamaterials to control the transmission of acoustic waves is a hot topic. An important class of these metamaterials is based on phononic crystals with Locally ... -
Analysis of PIFA antenna coupling in nearby traces and reduction with CSRRs in PCB at 2.45 GHz
(Institute of Electrical and Electronics Engineers (IEEE), 2015)
Text en actes de congrés
Accés obertThe 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 ... -
Broadband and Intense Sound Transmission Loss by a Coupled-Resonance Acoustic Metamaterial
(2021-11-01)
Article
Accés obertThe advent of acoustic metamaterials has opened up an emerging frontier in the control of sound transmission. A key limitation, however, is that an acoustic metamaterial based on a single local resonator in the unit cell ... -
Building metamaterials
(Universitat Politècnica de Catalunya, 2019-10)
Projecte Final de Màster Oficial
Accés restringit per acord de confidencialitatThis thesis shows the work done to design, fabricate and characterise the formation of nanostructures built with polystyrene nanospheres (295 nm, 522 nm and 836 nm diameter size) in an attempt to develop all dielectric ... -
Characterization and modelling of switchable stop-band filters based on RF-MEMS and complementary split ring resonators
(2010-08-13)
Article
Accés obertIn 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
(2009-06)
Comunicació de congrés
Accés obertThis 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 ... -
Coiled phononic crystal with periodic rotational locking: subwavelength bragg band gaps
(American Physical Society (APS), 2022-07-15)
Article
Accés obertPhononic crystals (PnC) are spatially periodic materials with band gaps that form by Bragg scattering of elastic waves. Within the frequency range of a band gap, wave propagation is not admitted. A long-standing limitation ... -
Computational design of locally resonant acoustic metamaterials
(2019-03)
Article
Accés obertThe 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
(John Wiley & Sons, 2017-12)
Article
Accés obertA 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 ... -
Computational Material design study of acoustic metamaterials and structures by topology optimization
(Universitat Politècnica de Catalunya, 2016-06)
Projecte Final de Màster Oficial
Accés restringit per decisió de l'autorAcoustic metamaterials are artificially designed and manufactured structures with dy-namical properties that are not typically found in naturally-occurring materials. The design of acoustic metamaterials is considered to ... -
Computational modelling of flexoelectricity-based 2D metamaterials
(Universitat Politècnica de Catalunya, 2021-07)
Projecte Final de Màster Oficial
Accés obertWe propose a methodology to impose generalised periodicity to the solution of the flexoelectric problem in the two-dimensional metamaterials design setting. To achieve this goal, we leverage an existing model for ... -
Computing and communications for the software-defined metamaterial paradigm: a context analysis
(Institute of Electrical and Electronics Engineers (IEEE), 2017-01-01)
Article
Accés obertMetamaterials are artificial structures that have recently enabled the realization of novel electromagnetic components with engineered and even unnatural functionalities. Existing metamaterials are specifically designed ... -
Conformal transformation of Dyakonov surface waves into bound states of cylindrical metamaterials
(American Physical Society (APS), 2019-11-05)
Article
Accés obertWe put forward the use of transformation optics to map surface waves that exist as one-dimensional modes supported by anisotropic structures into bound states in two-dimensional geometries. Specifically, we show the conformal ... -
Design of woven meta-materials for electronic textiles for functional applications
(2023)
Article
Accés obertIn this paper, woven wearable metamaterials are developed. For this purpose, several frequency selective surface (FSS) textile absorbers are proposed. The main structure of the FSS consists of a fabric with different patch ...