Now showing items 1-20 of 42

    • A contactless dielectric constant sensing system based on a split-ring resonator-loaded monopole 

      Carnerero Cano, Javier; Galindo Romera, Gabriel; Martínez Martínez, José Juan; Herraiz Martínez, Francisco Javier (01/06/2018)
      In this paper, a low-cost contactless passive sensor is designed and manufactured. The structure consists of a short-circuited printed monopole antenna coupled to two split-ring resonators. The permittivity of the materials ...
    • A contactless RFID system based on chipless MIW tags 

      Martínez Martínez, José Juan; Herraiz Martínez, Francisco Javier; Galindo Romera, Gabriel (01/10/2018)
      In this paper, a contactless RFID system formed by chipless tags based on the magneto-inductive wave (MIW) delay lines is proposed. In order to carry out the reading process, two reader probes have been designed, manufactured, ...
    • An IoT reader for wireless passive electromagnetic sensors 

      Galindo Romera, Gabriel; Carnerero Cano, Javier; Martínez Martínez, José Juan; Herraiz Martínez, Francisco Javier (01/04/2017)
      In the last years, many passive electromagnetic sensors have been reported. Some of these sensors are used for measuring harmful substances. Moreover, the response of these sensors is usually obtained with laboratory ...
    • Bandwidth limitations of ultra high frequency-radio frequency identification tags 

      Zamora González, Gerard; Paredes Marco, Ferran; Herraiz Martínez, Francisco Javier; Martín Antolín, Ferran; Bonache Albacete, Jordi (16/07/2013)
      Fundamental bandwidth limitations on the design of ultra high frequency (UHF) radio frequency identification (RFID) tags are investigated. This study was conducted by considering the optimum equivalent-circuit network ...
    • Campos Electromagnéticos 

      Herraiz Martínez, Francisco Javier (08/01/2018)
    • Campos Electromagnéticos 

      Centeno Hernáez, Efraim; Fernández Bernal, Fidel; Herraiz Martínez, Francisco Javier; Malagón Luque, Constantino; Rodríguez Marrero, José Luis (06/09/2019)
    • Campos Electromagnéticos 

      Fernández Bernal, Fidel; Herraiz Martínez, Francisco Javier (06/09/2019)
    • Design and characterization of a passive temperature sensor based on a printed MIW delay line 

      Martínez Martínez, José Juan; Herraiz Martínez, Francisco Javier; Galindo Romera, Gabriel (15/11/2016)
      A passive electromagnetic temperature sensor based on a magneto-inductive wave (MIW) delay line is presented. The working principle is the following: a reader sends a pulse in the time domain to the sensor, which produces ...
    • 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 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). ...
    • 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 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 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 ...
    • Electrónica de comunicaciones 

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

      Giannetti, Romano; Herraiz Martínez, Francisco Javier; Lorenzo Ros, Sara; Rodríguez Pecharromán, Ramón (23/07/2019)
    • 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, ...
    • Fundamental mode leaky-wave-antenna (LWA) using slot line and split-ring-resonator(SRR)-based metamaterials 

      Zamora González, Gerard; Zuffanelli, Simone; Paredes Marco, Ferran; Herraiz Martínez, Francisco Javier; Martín Antolín, Ferran; Bonache Albacete, Jordi (28/10/2013)
      A new composite right/left-handed (CRLH) slotline leaky-wave antenna (LWA) is proposed. The antenna, implemented by loading a slotline with split-ring resonators (SRRs), is designed to exhibit a balanced dispersion relation, ...
    • Left-handed wire antennas over ground plane with wideband tuning 

      Herraiz Martínez, Francisco Javier; Hall, Peter S.; Liu, Qing; Segovia Vargas, Daniel (01/05/2011)
      Tunable left-handed (LH) wire antennas over a ground plane are presented in this paper. These antennas are small and have a wide tuning bandwidth and are matched to 50 ? within the operation range. Two kinds of antennas ...