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Mostrando ítems 21-40 de 85

    • Design method for actively matched antennas with non-foster elements 

      Albarracín Vargas, Fernando; González Posadas, Vicente; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel (01/09/2016)
      The design of electrically small antennas (ESAs) loaded with active non-Foster elements is a topic whose interest has grown in the last years. In this communication, a new strategy for the design of actively matched antennas ...

    • Design of a low-cost wireless reader for an electromagnetic passive temperature sensor 

      Martínez Martínez, José Juan; Galindo Romera, Gabriel; Herraiz Martínez, Francisco Javier
      A low-cost wireless reader for a passive temperature sensor based on Magneto-Inductive Wave (MIW) delay lines is proposed in this paper. The sensor used is a time domain sensor working at 2.55 GHz. 10-ns width pulses are ...

    • Design of a low-cost wireless reader for an electromagnetic passive temperature sensor 

      Martínez Martínez, José Juan; Galindo Romera, Gabriel; Herraiz Martínez, Francisco Javier (IEEE Antennas and Propagation Society; Institute of Electrical and Electronics Engineers (San Diego, Estados Unidos de América), 09/07/2017)
      A low-cost wireless reader for a passive temperature sensor based on Magneto-Inductive Wave (MIW) delay lines is proposed in this paper. The sensor used is a time domain sensor working at 2.55 GHz. 10-ns width pulses are ...

    • Design of dual-frequency SRR-loaded dipole with equivalent circuit approach 

      González Posadas, Vicente; Jiménez Martín, Jose Luís; Herraiz Martínez, Francisco Javier; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (10/09/2009)
      An equivalent circuit approach to design dual-frequency printed dipoles is presented. This approach is based on magnetic coupled circuit characterising an antipodal printed dipole loaded with split ring resonators (SRRs). ...

    • Design techniques for circularly polarized antennas using metamaterial structures 

      Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; González Posadas, Vicente; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (Sin editorial (Roma, Italia), 29/09/2009)
      In this paper four multi-frequency circularly polarized antennas are proposed. The first one is a 4-ports self-diplexed multi-frequency RHCP-LHCP antenna. The second antenna is a single-feed short-circuited circular patch ...

    • Dual-band printed dipole antenna loaded with open complementary split-ring resonators for wireless applications 

      Herraiz Martínez, Francisco Javier; Paredes Marco, Ferran; Zamora González, Gerard; Martín Antolín, Ferran; Bonache Albacete, Jordi (01/04/2012)
      In this article, a printed dipole antenna loaded with open complementary split ring resonators is proposed. The integration of these particles inside the dipole structure provides dual-band behavior. Furthermore, a ...

    • Dual-band RFID tags based on folded dipole antennas loaded with spiral resonators 

      Paredes Marco, Ferran; Zamora González, Gerard; Herraiz Martínez, Francisco Javier; Martín Antolín, Ferran; Bonache Albacete, Jordi (Sin editorial (Tucson, Estados Unidos de América), 05/03/2012)
      The purpose of this paper is to demonstrate the possibility of implementing folded dipole antennas operative at two closely spaced frequencies of interest, for instance, in ultra-high-frequency radio frequency identification ...

    • Dual-band UHF-RFID tags based on meander-line antennas loaded with spiral resonators 

      Paredes Marco, Ferran; Zamora González, Gerard; Herraiz Martínez, Francisco Javier; Martín Antolín, Ferran; Bonache Albacete, Jordi (25/07/2011)
      The purpose of this letter is to implement dual-band tags for ultrahigh-frequency (UHF) radio frequency identification (RFID) applications operative in Europe and the US. Since the regulated bands of UHF-RFID in Europe ...

    • Dual-frequency printed dipole loaded with metamaterial particles 

      Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel; García Muñoz, Luis Enrique; González Posadas, Vicente (Sin editorial (San Diego, Estados Unidos de América), 05/07/2008)
      In this paper a dual-frequency printed dipole is presented. This antenna is made by loading a dipole printed on both sides of a FR-4 substrate with metamaterial resonant particles. First, a simplified model based on a ...

    • Dual-frequency printed dipole loaded with split ring resonators 

      Herraiz Martínez, Francisco Javier; García Muñoz, Luis Enrique; González Ovejero, David; González Posadas, Vicente; Segovia Vargas, Daniel (09/01/2009)
      A novel approach to design dual-frequency printed dipoles is presented. This approach is based on an antipodal printed dipole loaded with split ring resonators (SRRs). This technique allows the choice of any pair of working ...

    • Dyson conical quad-spiral array for VLBI2010 

      Rivera Lavado, Alejandro; Llorente Romano, Sergio; Herraiz Martínez, Francisco Javier; García Muñoz, Luis Enrique; López Fernández, Jose Antonio; López Pérez, Jose Antonio; Tercero Martínez, Felix; Segovia Vargas, Daniel (Sin editorial (La Haya, España), 06/04/2014)
      A new topology that potentially can open new solutions for covering the new VLBI2010 configuration and its frequency bands associated is presented in this manuscript. In this approach a single band from 2 to 14 GHz is ...

    • Electrónica 

      Alonso Rivas, Eduardo; Campoy Cervera, Luis Miguel; Casado Pérez, Pablo; Casatejada Herrera, Pedro; Cucala García, Luis; de Juana López, Esther; de la Peña Llerandi, Jaime; Domínguez Ferreiro, Ramón; Giannetti, Romano; Herraiz Martínez, Francisco Javier; Herranz Jiménez, Jose Luis; Lizón Martínez, Santiago; López Angulo, Antonio José; Maroto Carro, Juan Carlos; Muñoz Frías, José Daniel; Muñoz Hernández, Alfonso; Rico Cabrera, Javier; Rodríguez Gómez, Diego; Velasco Valencia, Raúl (09/01/2024)

    • Electrónica de Comunicaciones 

      Giannetti, Romano; Herraiz Martínez, Francisco Javier; Lorenzo Ros, Sara; Rodríguez Pecharromán, Ramón (23/07/2019)

    • Electrónica de comunicaciones 

      Herraiz Martínez, Francisco Javier; Rodríguez Marrero, José Luis (31/08/2017)

    • Electrónica de Comunicaciones 

      Giannetti, Romano; Hernández González, Clara; Herraiz Martínez, Francisco Javier; Rodríguez Pecharromán, Ramón (17/07/2021)

    • Electrónica de Comunicaciones 

      Giannetti, Romano; Hernández González, Clara; Herraiz Martínez, Francisco Javier; Rodríguez Pecharromán, Ramón (26/07/2020)

    • Electrónica de Comunicaciones 

      Giannetti, Romano; Hernández González, Clara; Herraiz Martínez, Francisco Javier (08/07/2022)

    • Electrónica de Comunicaciones 

      Giannetti, Romano; Herraiz Martínez, Francisco Javier; Herrera Alzu, Ignacio (18/07/2023)

    • Filtering lens structure based on SRRs in the low THz band 

      Andrés García, Belén; García Muñoz, Luis Enrique; González Posadas, Vicente; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel (01/05/2009)
      A filtering lens for conical horns based on Metamaterials is presented. The paper focuses on a millimeter wave application. The metamaterial structure is composed of a printed layer of Split Ring Resonators (SRRs) on a ...

    • Free-space and on-metal dual-band tag for UHF-RFID applications in Europe and USA 

      Paredes Marco, Ferran; Zamora González, Gerard; Zuffanelli, Simone; Herraiz Martínez, Francisco Javier; Martín Antolín, Ferran; Bonache Albacete, Jordi (01/09/2013)
      In this paper, we present an UHF-RFID tag mountable on metallic surfaces and capable to operate in the assigned frequency bands in Europe (866-869 MHz) and USA (902-928 MHz). Due to the proximity of these frequency bands, ...