• A Broadband Cavity-Backed Slot for Series-Fed Arrays 

      Hernández Escobar, Alberto (UMA Editorial, 2022-01-26)
      A pesar de que el diseño de antenas en el contexto de los sistemas de comunicaciones es uno de los desafíos más clásicos en la ingeniería de telecomunicación, las antenas para nuevas aplicaciones y servicios de reciente ...
    • Análisis Preliminar del Strip-slot Complementario en Tecnología Stripline 

      Hernández Escobar, Alberto; Abdo Sánchez, Elena; Camacho-Peñalosa, Carlos (2017-09-20)
      A stripline-fed slot antenna configuration is proposed using planar technology. Its main advantages are the broad impedance bandwidth available and the radiation in only one half-space, which are obtained with the use of ...
    • Barrido del haz en antena de onda de fuga basada en metasuperficie mediante cristales líquidos 

      Abdo Sánchez, 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 ...
    • A Broadband Bow-Tie Cavity-Backed Slot for Traveling-Wave Arrays in the Millimeter-Wave Band 

      Hernández Escobar, Alberto; Abdo Sánchez, Elena; Camacho-Peñalosa, Carlos (2019-05-07)
      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 Sánchez, 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 ...
    • Dual Beam Sinusoidally Modulated Reactance Surface Antenna 

      Abdo Sánchez, Elena; Pérez Aguilar, Lorena; Martin-Guerrero, Teresa Maria; Camacho-Peñalosa, Carlos (2020-09)
      In this work, a planar dual beam Sinusoidally Modulated Reactance Surface (SMRS) antenna is presented. Our method is based on the implementation of a surface impedance modulated by the superposition of two sinusoidal ...
    • Eigenstate equivalent circuit for bi-periodic surfaces: Application to three parallel dipoles 

      Hernández Escobar, Alberto; Abdo Sánchez, Elena; Esteban, Jaime; Martin-Guerrero, Teresa Maria; Camacho-Peñalosa, Carlos (2022-03-29)
      An equivalent circuit for the unit cell of bi-periodic surfaces is proposed. The equivalent circuit is general and simple. It is based on the decomposition of the eigenmodes of the structure and it takes into account the ...
    • Elemento radiante de banda ancha en microstrip cerrada para arrays alimentados en serie 

      Hernández Escobar, Alberto; Abdo Sánchez, Elena; Camacho-Peñalosa, Carlos (2018-09-07)
      A previous radiating element in transmission configuration proposed by the authors is alternatively implemented using enclosed microstrip configuration. The new implementation overcomes fabrication issues and improves its ...
    • Equivalent Circuit Modelling of Non-Symmetric Reciprocal Lossy Electromagnetic Structures 

      Abdo Sánchez, Elena; Martin-Guerrero, Teresa Maria; Esteban, Jaime; Camacho-Peñalosa, Carlos (2018-06-04)
      Lattice-network-based equivalent circuits of lossy symmetric reciprocal electromagnetic structures have shown superior performance when compared to other topologies like the T- or PI- networks. This is due to the realizability ...
    • Experimental Verification of a Leaky-Wave Antenna Based on Bianisotropic Huygens’ Metasurface 

      Abdo Sánchez, Elena; Chen, Michael; Epstein, Ariel; Eleftheriades, George V. (2019-05-06)
      Abstract—In this communication, the experimental verification of a leaky-wave antenna that uses a Huygens’ metasurface to have a control on the radiation parameters is addressed. The antenna consists of a parallel-plate ...
    • Implementación de antena leaky-wave basada en metasuperficie de Huygens 

      Abdo Sánchez, Elena; Epstein, Ariel; Eleftheriades, George V. (2018-09-07)
      In this communication, the implementation of a leaky-wave antenna based on bianisotropic Huygens’ metasurface is addressed. It consists of a parallel-plate waveguide in which the top plate is replaced by a metasurface. It ...
    • Measuring odd- and even-mode propagation constants of coupled-lines by means of the lattice network 

      Hernández-Escobar, Alberto; Abdo Sánchez, Elena; Esteban, Jaime; Martin-Guerrero, Teresa Maria; Camacho-Peñalosa, Carlos (2019-10-30)
      A classic method for measuring the propagation constant of transmission lines is the one proposed by Bianco and Parodi more than four decades ago [1]. It is based on the invariance of the cross ratio of four complex numbers ...
    • Non-homogeneous Fabry-Pérot Antenna Design at Ku-band 

      Mateos-Ruiz, Pablo; Abdo Sánchez, Elena; Camacho-Peñalosa, Carlos (2021-09-21)
      A novel technique to design Fabry-Pérot antennas with non-homogeneous PRS is described. It takes advantage of a transmission line circuit model to efficiently obtain all necessary unit cell designs that satisfy the cavity ...
    • Non-homogeneous Fabry-Pérot antenna design process to improve aperture efficiency 

      Mateos Ruíz, Pablo; Abdo Sánchez, Elena; Camacho-Peñalosa, Carlos (2022-03-27)
      A novel technique to design Fabry-Pérot antennas with non-homogeneous partially reflective surfaces (PRSs) is described. It uses a transmission line circuit model to efficiently obtain all necessary unit cell designs that ...
    • On the eigenstate equivalent circuit for lossy asymmetric two-ports and its applications 

      Esteban, Jaime; Hernández Escobar, Alberto; Abdo Sánchez, Elena; Mateos Ruíz, Pablo; Martin-Guerrero, Teresa Maria; [et al.] (2022)
      An equivalent-circuit topology for two-port lossy non-symmetric reciprocal networks is presented [1]. The circuit topology is based on the eigenstate decomposition. The proposed circuit consists of two immittances and two ...
    • On the use of bianisotropic huygens' metasurfaces to build leaky-wave antennas 

      Abdo Sánchez, Elena; Chen, M.; Epstein, Ariel; Eleftheriades, G. V. (2019-07-16)
      Huygens' metasurfaces are considered a powerful tool to achieve anomalous electromagnetic field transformations. They consist of an artifcial surface built of pairs of collocated electric and magetic dipoles that force ...
    • Performance analysis of equivalent-circuit topologies for periodic leaky-wave antenna rsymmetric Radiators 

      Hernández Escolar, Alberto; Abdo Sánchez, Elena; Mateos Ruíz, Pablo; Esteban, Jaime; Martin-Guerrero, Teresa Maria; [et al.] (2022-04)
      The traditional problem of broadside radiation degradation in leaky-wave antennas has been overcome in the past years with the introduction of some asymmetry in the radiator. This article analyses the performance of two ...