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Listar por palabra clave "Electromagnetic waves"

Mostrando ítems 1-8 de 8

Anisotropic Metamaterials as sensing devices in acoustics and electromagnetism

Sánchez-Dehesa Moreno-Cid, José; Torrent Martí, Daniel; Carbonell Olivares, Jorge (Society of Photo-optical Instrumentation Engineers (SPIE), 2012)

We analyze the properties of acoustic and electromagnetic metamaterials with anisotropic constitutive parameters. Particularly, we analyze the so-called Radial Wave Crystals, which are radially periodic structures verifying ...
Explicit finite-difference time-domain scheme for the simulation of 1-3 piezoelectric effect in axisymmetrical configurations

Ferri García, Marcelino; Camarena Femenia, Francisco; Redondo, Javier; Picó Vila, Rubén; Avis, Mark R. (Elsevier, 2012-09)

[EN] Numerical simulations are useful in the processes of design, development and optimization of transducers for non-destructive testing. In this work, a three-dimensional velocity-stress finite-difference model is presented ...
Modulation of electromagnetic waves by alternating currents through left-handed ferromagnetic microwires

García Miquel, Ángel Héctor; Carbonell Olivares, Jorge; Sánchez-Dehesa Moreno-Cid, José (American Institute of Physics (AIP), 2012)

We present experimental results of electromagnetic wave modulation by the application of AC currents along a ferromagnetic microwire at the frequency range where left-handed transmission is observed. It is demonstrated ...
Multidisciplinary approach to cylindrical anisotropic metamaterials

Carbonell Olivares, Jorge; Torrent Martí, Daniel; Díaz Rubio, Ana; Sánchez-Dehesa Moreno-Cid, José (IOP Publishing: Open Access Journals, 2011)

Anisotropic characteristics of cylindrically corrugated microstructures are analyzed in terms of their acoustic and electromagnetic (EM) behavior paying special attention to their differences and similarities. A simple ...
Multiple scattering formulation of two-dimensional acoustic and electromagnetic metamaterials

Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José (IOP Publishing: Open Access Journals, 2011-09-09)

A multiple scattering formulation of two-dimensional (2D) acoustic metamaterials is presented. This approach is comprehensive and can lead to frequency-dependent effective parameters (scalar bulk modulus and tensorial mass ...
Underwater Ad Hoc Wireless Communication for Video Delivery

Sendra, Sandra; Lloret, Jaime; Jimenez, Jose M.; Ghafoor, Kayhan Zrar (Springer-Verlag, 2017)

[EN] Due to the high attenuation of the water at high frequencies, underwater communications in freshwater are not being investigated so much. Many current underwater communication systems are based on acoustic or optical ...
Underwater communications for video surveillance systems at 2.4 GHz

Sendra, Sandra; Lloret, Jaime; Jimenez, Jose M.; Rodrigues, Joel José Puga Coelho (MDPI, 2016-10)

Video surveillance is needed to control many activities performed in underwater environments. The use of wired media can be a problem since the material specially designed for underwater environments is very expensive. In ...
Underwater Wireless Sensor Communications in the 2.4 GHz ISM Frequency Band

Lloret, Jaime; Sendra Compte, Sandra; Ardid Ramírez, Miguel; Puga Coelho Rodrigues, Joel José (MDPI, 2012-04)

One of the main problems in underwater communications is the low data rate available due to the use of low frequencies. Moreover, there are many problems inherent to the medium such as reflections, refraction, energy ...