29 citations · 203 across the 14 of their papers we have counts for
14 papers
Analytical Framework to Model Reconfigurable Metasurfaces including Lumped Elements
Mario Pérez-Escribano, Salvador Moreno-Rodríguez, Carlos Molero +3
This paper presents an analytical framework, based on Floquet modal expansions of the electromagnetic fields and equivalent circuits, to model reconfigurable metasurfaces loaded wi…
Three-Dimensional Fully Metallic Dual Polarization Frequency Selective Surface Design Using Coupled-Resonator Circuit Information
Ignacio Parellada-Serrano, Mario Pérez-Escribano, Carlos Molero +2
This work employs a new approach to analyze coupled-resonator circuits to design and manufacture a fully metallic dual polarization frequency selective surface (FSS). The proposed…
Joint Ultra-wideband Characterization of Azimuth, Elevation and Time of Arrival with Toric Arrays
Alejandro Ramírez-Arroyo, Antonio Alex-Amor, Rubén Medina +2
In this paper, we present an analytical framework for the joint characterization of the 3D direction of arrival (DoA), i.e., azimuth and elevation components, and time of arrival (…
Analytical Equivalent Circuits for Three-dimensional Metamaterials and Metagratings
Antonio Alex-Amor, Salvador Moreno-Rodríguez, Pablo Padilla +2
In recent times, three-dimensional (3D) metamaterials have undergone a revolution driven mainly by the popularization of 3D-printing techniques, which has enabled the implementatio…
Time-periodic Metallic Metamaterials defined by Floquet Circuits
Salvador Moreno-Rodríguez, Antonio Alex-Amor, Pablo Padilla +2
In this paper, we study the scattering and diffraction phenomena in time-modulated metamaterials of metallic nature by means of Floquet equivalent circuits. Concretely, we focus on…
Joint Direction-of-Arrival and Time-of-Arrival Estimation with Ultra-wideband Elliptical Arrays
Alejandro Ramírez-Arroyo, Antonio Alex-Amor, Pablo Padilla +1
This paper presents a general technique for the joint Direction-of-Arrival (DoA) and Time-of-Arrival (ToA) estimation in multipath environments. The proposed ultra-wideband techniq…
Diffraction Phenomena in Time-varying Metal-based Metasurfaces
Antonio Alex-Amor, Salvador Moreno-Rodriguez, Pablo Padilla +2
This paper presents an analytical framework for the analysis of time-varying metal-based metamaterials. Concretely, we particularize the study to time-modulated metal-air interface…
Cross-polarization Control in FSSs by means of an Equivalent Circuit Approach
Carlos Molero, Antonio Alex-Amor, Francisco Mesa +2
This paper presents an efficient equivalent circuit approach (ECA), based on a Floquet modal expansion, for the study of the co- and cross-polarization in frequency selective surfa…
Generalized Director Approach for Liquid-Crystal-Based Reconfigurable RF Devices
Antonio Alex-Amor, Angel Palomares-Caballero, Antonio Palomares +3
This letter presents a closed-form integral-equation formulation that models the director tilting in nematic liquid crystals. The proposed formulation is computationally efficient…
Glide-Symmetric Metallic Structures with Elliptical Holes for Lens Compression
Antonio Alex-Amor, Fatemeh Ghasemifard, Guido Valerio +4
In this paper, we study the wave propagation in a metallic parallel-plate structure with glide-symmetric elliptical holes. To perform this study, we derived a mode-matching techniq…
Dispersion and Filtering Properties of Rectangular Waveguides Loaded With Holey Structures
Ángel Palomares-Caballero, Antonio Alex-Amor, Pablo Padilla +1
This paper analyzes thoroughly the dispersion and filtering features of periodic holey waveguides in the millimeter-wave frequency range. Two structures are mainly studied dependin…
Exploring the Potentials of the Multi-modal Equivalent Circuit Approach for Stacks of 2-D Aperture Arrays
Antonio Alex-Amor, Francisco Mesa, Ángel Palomares-Caballero +2
Many frequency selective surface (FSS) structures are based on the use of a single periodic array of slot/apertures in a conducting sheet embedded in a layered medium. However, it…
Dispersion Analysis of Periodic Structures in Anisotropic Media: Application to Liquid Crystals
Antonio Alex-Amor, Angel Palomares-Caballero, Francisco Mesa +2
This paper presents an efficient method to compute the dispersion diagram of periodic and uniform structures with generic anisotropic media. The method takes advantage of the abili…
Low-Loss Reconfigurable Phase Shifter in Gap-Waveguide Technology for mm-Wave Applications
Á. Palomares-Caballero, A. Alex-Amor, P. Escobedo +2
In this brief, we present a low-loss mechanically reconfigurable phase shifter implemented in gap-waveguide technology for mm-wave frequencies. The proposed design gives a practica…