Listar IC - Contribuciones a congresos científicos por título
Mostrando ítems 40-59 de 288
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Backing off from rayleigh and rice: Achieving perfect secrecy in wireless fading channels
(Escuela Técnica Superior de Ingeniería de Telecomunicación de la UMA, 2020-09)We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatter- ers, it is possible to achieve perfect secrecy even in the presence of a passive eavesdropper for which no ... -
Barrido del haz en antena de onda de fuga basada en metasuperficie mediante cristales líquidos
Abdo-Sanchez, Maria Elena
; Epstein, Ariel; Eleftheriades, George V. (Iñigo Cuiñas Gómez, 2021-09-23)
In this communication, the reconfigurability mechanisms for beam steering at a fixed frequency in a leakywave antenna based on Huygens metasurfaces are reviewed. A preliminary design for a forward-to-backward scanning ... -
Bricked and evanescently-coupled topologies: expanding the portfolio of subwavelength metamaterial silicon photonic devices
Wanguemert-Perez, Juan Gonzalo; Pérez-Armenta, Carlos; Ginel-Moreno, Pablo; Luque-González, Jose Manuel; Hadij-ElHouati, Abdelfettah; Sánchez-Postigo, Alejandro; de-Oliva Rubio, José; Ortega-Moñux, Alejandro; Halir, Robert; Schmid, Jens H.; Cheben, Pavel; Molina-Fernández, Iñigo[et al.] (SPIE, 2023-02)
We present two novel topologies of subwavelength grating (SWG) waveguides: the bricked-SWG and the evanescently-coupled-SWG. The bricked topology enables accurate control of waveguide anisotropy while maintaining the index ... -
Bricked subwavelength structures: a flexible metamaterial topology
Luque-González, José Manuel; Ortega-Moñux, Alejandro; Halir, Robert; Molina-Fernandez, Iñigo; Wanguemert-Perez, Juan Gonzalo; Cheben, Pavel; Schmid, Jens H.[et al.] (2021)
Subwavelength gratings (SWG) are periodic structures that synthesize lithography tailorable metamaterials with desired permittivity, dispersion, and anisotropy, enabling the design of a myriad of high-performance devices. ... -
A Broadband Bow-Tie Cavity-Backed Slot for Traveling-Wave Arrays in the Millimeter-Wave Band
The use of bow-tie geometries to enhance the characteristics of a radiating element previously proposed by the authors is presented. The previous element consisted of a broadband cavity-backed slot in transmission ... -
Building Arrays with the Unidirectional-Radiating Complementary Strip-Slot
Hernández Escobar, Alberto; Abdo-Sanchez, Maria Elena; Camacho-Peñalosa, Carlos (Iñigo Cuíñas Gómez, 2021-09)
An upgraded version of the complementary stripslot radiating element is reviewed. The original radiating element consists in a microstrip-fed slot in transmission configuration. In the proposed modification, the slot is ... -
Building high-performance integrated optical devices using subwavelength grating metamaterials
Sánchez-Postigo, Alejandro; Ginel-Moreno, Pablo; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert; Pereira-Martín, Daniel; Hadij-ElHouati, Abdelfettah; Schmid, Jens H.; Wang, Shurui; Vachon, Martin; Xu, Dan-Xia; Ye, Winnie N.; Soler-Penades, Jordi; Nedeljkovic, Milos; Mashanovich, Goran Z.; Cheben, Pavel; Molina-Fernandez, Iñigo[et al.] (2021-09)
The use of subwavelength grating structures in silicon waveguides have fuelled the development of integrated optical components with superior performance. By a judicious lithographic pattern of the grating, the optical ... -
Butler Matrix Based Six-port Passive Junction
Moscoso Mártir, Álvaro; Ávila Ruiz, Jose Manuel; Durán Valdeiglesias, Elena; Moreno-Pozas, Laureano; Molina-Fernandez, Iñigo; Ortega-Moñux, Alejandro; De-Oliva-Rubio, Jose[et al.] (2014-02-03)
In this work we propose the utilization of the Butler matrix as a six-port I/Q demodulator. The inherent symmetry of its topology allows to overcome the intrinsic amplitude and phase imbalances of the traditional approaches ... -
Calibración de los parámetros del modelo de directividad de los transductores de la Ecosonda Simrad EK60
Cordoba Selles, Pilar; Iglesias Marroig, Magdalena; Nava-Baro, Enrique; Miquel Batle, Joan; Clemente-Medina, Maria del Carmen (2015-11-18)
La ecosonda científica Simrad EK60 se utiliza para cuantificar los recursos pesqueros en campañas de investigación oceanográfica, utilizando diferentes canales de frecuencias (de 18KHz a 200KHz) mediante transductores ... -
Calidad de transmisión de vídeo en redes de comunicaciones submarinas
Poncela-Gonzalez, Javier; Moreno, Jose Miguel (2015-11-24)
La adquisición de imágenes submarinas plantea en la actualidad importantes dificultades especialmente en términos de coste y/o retardo en la disponibilidad de la información. Las transmisiones de vídeo a través de redes ... -
Caracterización de modelos no-lineales casi-estáticos a partir de las formas de onda en régimen de gran señal
Perez-Parras, Sergio Luis; Martin-Guerrero, Teresa Maria; Baños-Polglase, Juana Daphne; Camacho-Peñalosa, Carlos (2018-09-07)
A method to extract the conduction and displacement components of nonlinear quasi-static current sources controlled by two variables is concisely described. The method is numerically tested by means of two different ... -
Caracterización de UWB y WiFi FTM en obras
Álvarez-Merino, Carlos S.; Luo Chen, Hao Qiang; Llanes Michel, Joel; Khatib, Emil J.; Barco-Moreno, Raquel (2022-09)
The construction industry is one of the largest sectors not having a major movement towards digitalisation. For this reason, in recent years, there is an effort for stimulating innovation in the construction site mainly ... -
Caracterización en banda ancha de la constante de propagación de materiales de impresión 3D
Perez-Escribano, Mario; Márquez-Segura, Enrique (2020-09-21)
In this work, a method for the characterization of the relative permittivity in broadband of 3D printing materials is proposed. It uses microstrip lines of different lengths covered with the material to be characterized. ... -
Caracterización estadística del desvanecimiento inducido por dispersión en sistemas de comunicación óptica inalámbrica submarina
Salcedo-Serrano, Pedro; Boluda-Ruiz, Ruben; Garrido-Balsells, José María; García-Zambrana, Antonio (2021)
An accurate underwater channel characterization is necessary for underwater optical wireless communication (UOWC) in order to improve its current limitations. This paper presents a new statistical model to characterize the ... -
Caracterización no-lineal de dispositivos de un puerto basada en el principio de distorsión poli-armónica
Martin-Guerrero, Teresa Maria; Entrambasaguas-Muñoz, José Tomás; Camacho-Peñalosa, Carlos (2017-09-13)
In this contribution the computation of a nonlinear diode model based on the Poly-Harmonic Distortion principle is described. The diode is composed of a non-linear conductance shunt connected to a non-linear capacitance, ... -
Caracterización y Simulación de un Diodo Schottky de Microondas
Moreno-Pozas, Laureano; Durán Valdeiglesias, Elena; Ávila Ruiz, Juan Manuel; Molina-Fernandez, Iñigo (2013-09)
Microwave diode models included in commercial simulators use a large set of parameters, so they are often difficult to set up in order to match the actual response of a specific device. In this paper a simple model for a ... -
Challenges In Video Quality Assessment For Underwater Wireless Sensor Networks
Poncela-Gonzalez, Javier (2017)
Underwater Networks poses as a challenging environment for video transmissions mainly because of an extremely limited available bitrate. In such constrained conditions, it is crucial to know the opinion of users which will ... -
Circuito equivalente del strip-slot complementario como red asimétrica con pérdidas
Esteban, Jaime; Abdo-Sanchez, Maria Elena; Martin-Guerrero, Teresa Maria; Camacho-Peñalosa, Carlos (2017-09-26)
The complementary strip-slot can be successfully modeled by means of a lattice equivalent circuit, with realizable immittances. In the case of the misaligned complementary stripslot, useful in series fed arrays, the lattice ... -
Close detection robotic platform for Search And Rescue missions based on Bluetooth Low Energy
Cantizani Estepa, Juan; Bravo Arrabal, Juan; Fernández-Lozano, Juan Jesús; Fortes-Rodriguez, Sergio; Barco-Moreno, Raquel; Garcia-Cerezo, Alfonso J.[et al.] (2022-02)
Improvements in telecommunications and digitalization directly improve the efficacy of a wide variety of processes. Recently, detection systems have received considerable attention because of the importance of tracking ... -
Comparación de servicios de video streaming de YouTube
Jiménez, Luis Roberto; Solera-Delgado, Marta; Toril-Genoves, Matias (2019-09-12)
YouTube is one of the most popular services on the Internet, enabling easy streaming of a video (conventional or live) with acceptable video quality. In March 2015, YouTube added 360o video streaming service which provides ...