Listar por autor "Palomares-Caballero, Ángel"
Mostrando ítems 1-12 de 12
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Broadband 1-bit Reconfigurable Intelligent Surface at Millimeter Waves: Overcoming PIN-Diode Degradation with Slotline Ring Topology.
Palomares-Caballero, Ángel; Pérez-Escribano, Mario
; Molero, Carlos; Padilla, Pablo; García-Vigueras, María; Gillard, Raphaël[et al.] (IEEE, 2025)
This paper explains the non-idealities that arise when using PIN diodes at millimeter-wave frequencies and the important limitations that they bring in classical configurations of 1-bit slotline reconfigurable unit cells. ... -
Broadband Frequency Selective Surface Absorber based on Laser-Induced Graphene for Applications from Ku-band to Q-band.
Ortiz Ruiz, Sergio; Pérez-Escribano, Mario; Moreno-Rodríguez, Salvador; Palomares-Caballero, Ángel; Valenzuela-Valdés, Juan Francisco; García-Ruiz, Francisco Javier; Molero, Carlos[et al.] (IEEE, 2025)
This work presents the design of a broadband frequency-selective surface absorber (FSSA) using laser-induced graphene (LIG). This type of resistive material composed of porous graphene has been analyzed, and its performance ... -
Broadband parasitic modeling of diodes in the millimeter-wave band
Pérez-Escribano, Mario; Palomares-Caballero, Ángel; Padilla, Pablo; Valenzuela-Valdés, Juan Francisco; Márquez-Segura, Enrique (Elsevier, 2024-03-06)
This paper presents the extraction of an equivalent circuit model for PIN diodes and varactors in the millimeter waves. This circuit model is handy for new communication applications involving, for example, electronic beam ... -
A Capacity-enhanced local search for the 5G cell switch-off problem
(2020-03-06)Network densification with deployments of many small base stations (SBSs) is a key enabler technology for the fifth generation (5G) cellular networks, and it is also clearly in conflict with one of the target design ... -
Contactless AF-SIW phase shifters based on periodic structures at mmWaves
Segura-Gómez, Cleofás; Pérez-Escribano, Mario; Biedma-Pérez, Andrés; Palomares-Caballero, Ángel; Padilla, Pablo (Elsevier, 2024)
This document presents different phase shifter designs implemented in contactless air-filled substrate-integrated waveguide (CLAF-SIW) technology. The phase shifters are based on unit cells that avoid leakage losses in ... -
Gain-Reconfigurable Hybrid Metal-Graphene Printed Yagi Antenna for Energy Harvesting Applications
(2019-04-26)This paper presents a hybrid metal-graphene printed Yagi antenna with reconfigurable gain that operates in the 5.5-GHz band. The balun and the driven elements are made of copper, while the directors are made of graphene. ... -
Glide-Symmetric Pin Phase Shifter implemented in Gap-Waveguide Technology
Palomares-Caballero, Ángel; Alex-Amor, Antonio; Valenzuela-Valdés, Juan Francisco; Luna-Valero, Francisco; Padilla-de-la-Torre, Pablo (2019-09-10)
This paper presents a compact and low-loss waveguide phase shifter based on a pin lattice in glide- symmetric configuration. There is a significant increase in provided phase shift when using a glide-symmetric pin distribution ... -
Metal-Only 3D Unit Cell for Reflectarrays with Independent Dual-Band Operation
Pérez-Escribano, Mario; Biedma-Pérez, Andrés; Parellada-Serrano, Ignacio; Palomares-Caballero, Ángel; Molero, Carlos; Rodríguez-Padilla, Pablo[et al.] (2024)
En este artículo se presenta un reflectarray solo metálico basado en una celda unidad tridimensional con capacidad de trabajar en doble banda. La celda unidad 3D es una guía de onda cuadrada cuyas paredes verticales incluyen ... -
Metal-Only 3D Unit Cell for Reflectarrays with Independent Dual-Band Operation.
Biedma-Pérez, Andrés; Pérez-Escribano, Mario; Parellada-Serrano, Ignacio; Palomares-Caballero, Ángel; Padilla, Pablo; García-Vigueras, María; Molero, Carlos[et al.] (IEEE, 2025)
This paper presents a metal-only reflectarray based on a 3D unit cell with dual-band capability. The 3D unit cell is a square waveguide whose vertical walls include resonator elements with independent frequency performance. ... -
Novel Frequency-Selective Surface Absorber based on Laser-Induced Graphene
Ortiz Ruiz, Sergio; Moreno-Rodríguez, Salvador; Pérez-Escribano, Mario; Palomares-Caballero, Ángel; Pasadas, Francisco; Valenzuela-Valdés, Juan Francisco; García-Ruiz, Francisco J.; Molero, Carlos[et al.] (URSI, 2024-09)
Este trabajo propone una técnica para el diseño de absorbedores de microondas y ondas milimétricas mediante la combinación de superficies selectivas en frecuencia (FSSs) y grafeno inducido por láser (LIG). En primera ... -
Optimized Varactor Parasitic Modelling in the Millimeter-Wave Band.
Pérez-Escribano, Mario; Palomares-Caballero, Ángel; Padilla, Pablo; Valenzuela-Valdés, Juan Francisco (2023)
This work explores the utilization of varactors in the millimeter-wave (mm-wave) band, specifically focusing on their application in voltage-controlled reconfigurable devices. Varactors, or variable capacitors, can adjust ... -
Phase Shifter for Millimeter-Wave Frequency Range Based on Glide Symmetric Structures
(2019-03-13)The use of glide symmetry in radiofrequency devices to introduce dispersive effects has been recently proposed and demonstrated. One of these effects is to control the propagation constant of the structure. Here, we propose ...