151 research outputs found
Seismic Waveguide of Metamaterials
We have developed a new method of an earthquake-resistant design to support
conventional aseismic designs using acoustic metamaterials. We suggest a simple
and practical method to reduce the amplitude of a seismic wave exponentially.
Our device is an attenuator of a seismic wave. Constructing a cylindrical
shell-type waveguide that creates a stop-band for the seismic wave, we convert
the wave into an evanescent wave for some frequency range without touching the
building we want to protect.Comment: 4 pages, 4 figure
Quasi-discrete microwave solitons in a split ring resonator-based left-handed coplanar waveguide
We study the propagation of quasi-discrete microwave solitons in a nonlinear
left-handed coplanar waveguide coupled with split ring resonators. By
considering the relevant transmission line analogue, we derive a nonlinear
lattice model which is studied analytically by means of a quasi-discrete
approximation. We derive a nonlinear Schr{\"o}dinger equation, and find that
the system supports bright envelope soliton solutions in a relatively wide
subinterval of the left-handed frequency band. We perform systematic numerical
simulations, in the framework of the nonlinear lattice model, to study the
propagation properties of the quasi-discrete microwave solitons. Our numerical
findings are in good agreement with the analytical predictions, and suggest
that the predicted structures are quite robust and may be observed in
experiments
Wave Energy Amplification in a Metamaterial based Traveling Wave Structure
We consider the interaction between a particle beam and a propagating
electromagnetic wave in the presence of a metamaterial. We show that the
introduction of a metamaterial gives rise to a novel dispersion curve which
determines a unique wave particle relationship, via the frequency dependence of
the metamaterial and the novel ability of metamaterials to exhibit simultaneous
negative permittivity and permeability. Using a modified form of Madey's
theorem we find that the novel dispersion of the metamaterial leads to a
amplification of the EM wave power
L'utilisation des SIG dans la modélisation en hydrologie de surface
From a methodological point of view, hydrological modelling
appears to offer a great potential for spatial analysis. However
among classes of models, only physical models consider the
spatial dimension as a variable. The topography and the land
cover are the two major spatial components involved in that
type of models. The production of a relevant DTM requires the
use of iterative interpolation procedures. Land cover and its
changes can be monitored and entered into modelling from
remote sensing images through a normalized Vegetation index. The GIS approach can be integrated at different levels
within hydrological modelling, with object oriented GIS seen
as the highest level
Three-Dimensional Nanotransmission Lines at Optical Frequencies: A Recipe for Broadband Negative-Refraction Optical Metamaterials
Here we apply the optical nanocircuit concepts to design and analyze in
detail a three-dimensional (3-D) plasmonic nanotransmission line network that
may act as a negative-refraction broadband metamaterial at infrared and optical
frequencies. After discussing the heuristic concepts at the basis of our
theory, we show full-wave analytical results of the expected behavior of such
materials, which show increased bandwidth and relative robustness to losses.
The possibility and constraints of getting a 3-D fully isotropic response is
also explored and conditions for minimal losses and increased bandwidth are
discussed. Full-wave analytical results for some design examples employing
realistic plasmonic materials at infrared and optical frequencies are also
presented, and a case of sub-wavelength imaging system using a slab of this
material is numerically investigated.Comment: 70 pages, 15 figure
Miniaturisation of artificial magnetic conductors: comparison methodology and realisation of compact unit cell
Automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs) through aggressive space mapping (ASM)
This paper is focused on the application of space mapping optimization to the automated synthesis of
transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs). These structures are of interest for the implementation of resonant-type metamaterial transmission lines and for the design of planar microwave circuits based on such complementary resonators. The paper presents a method to generate the layouts of CSRR- and
OCSRR-loaded microstrip lines from the elements of their equivalent circuit models. Using the so-called aggressive space mapping, a specific implementation that uses quasi-Newton type iteration, we have developed synthesis algorithms that are able to provide the topology of these CSRR and OCSRR-loaded lines in few steps. The most relevant aspect, however, is that this synthesis process is completely
automatic, i.e., it does not require any action from the designers, other than initiating the algorithm. Moreover, this technique can be translated to other electrically small planar elements described by lumped element equivalent circuit models.This work has been partially supported by MICIIN-Spain (Projects TEC2010-17512 METATRANSFER, TEC2010-21520-C04-01 AVANSAT, CONSOLIDER EMET CSD2008-00066, and Grant AP2008-04707), Generalitat de Catalunya (Project 2009SGR-421), and MITyC-Spain (Project TSI-020100-2010-169 METASINTESIS). Ferran Martin is in debt to ICREA for supporting his work through an ICREA Academia Award (calls 2008 and 2013).Selga, J.; Rodríguez Pérez, AM.; Orellana, M.; Boria Esbert, VE.; Martín, F. (2014). Automated synthesis of transmission lines loaded with complementary split ring resonators (CSRRs) and open complementary split ring resonators (OCSRRs) through aggressive space mapping (ASM). 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