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Mostrando ítems 1-20 de 54

    • A dual band circularly polarized antenna based on a microstrip patch filled with left-handed structures 

      Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Segovia Vargas, Daniel (Sin editorial (Edimburgo, Reino Unido), 11/11/2007)
      Microstrip patches filled with left-handed structures are proposed to obtain dual band circularly polarized antennas. The proposed antennas have two modes at different frequencies with similar characteristics to the ...

    • A passive temperature sensor based on a printed magnetoinductive-wave (MIW) delay line 

      Herraiz Martínez, Francisco Javier; Martínez Cebrián, Javier; Segovia Vargas, Daniel (Sin editorial (París, Francia), 06/09/2015)
      Novel fully passive and electromagnetic sensors are proposed. These sensors are implemented with magnetoinductive-wave (MIW) delay lines. Such lines are composed of a periodic array of coupled square split ring resonators ...

    • 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 ...

    • Application of the left-handed half-ioop antenna with wideband tuning to a cognitive radio terminal 

      Herraiz Martínez, Francisco Javier; Hall, Peter S.; Segovia Vargas, Daniel (Sin editorial (Barcelona, España), 12/04/2010)
      A compact system for future communication terminals (Cognitive Radio) is presented in this paper. This system is based on two antennas printed on the same substrate board. The total dimensions of the board are 60 mm × 60 ...

    • Arrays of dual-band printed dipoles loaded with metamaterial particles 

      Herraiz Martínez, Francisco Javier; García Muñoz, Luis Enrique; Segovia Vargas, Daniel; González Ovejero, David; Craeye, Christophe (Sin editorial (Berlín, Alemania), 23/03/2009)
      Arrays of printed dipoles loaded with metamaterial particles are presented in this paper. The use of these loaded dipoles can improve the features of the arrays. Two applications are proposed: the miniaturization of the ...

    • 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 ...

    • Chipless RFID system based on magnetoinductive-wave (MIW) delay lines 

      Herraiz Martínez, Francisco Javier; Ugarte Muñoz, Eduardo; Segovia Vargas, Daniel; Paredes Marco, Ferran; Zamora González, Gerard; Martín Antolín, Ferran; Bonache Albacete, Jordi (Sin editorial (Nagoya, Japón), 29/10/2012)
      A novel fully passive and electromagnetic chipless radiofrequency identification (RFID) system is proposed. The system is based on printed tags implemented with magnetoinductive-wave (MIW) delay lines. Such lines are ...

    • Chipless RFID tags based on magneto-inductive or electro-inductive delay lines 

      Herraiz Martínez, Francisco Javier; González Moreno, Alvaro; Segovia Vargas, Daniel (Sin editorial (Dubrovnik, Croacia), 14/10/2013)
      Novel fully passive and electromagnetic chipless tags are proposed. These tags are implemented with magnetoinductive-wave (MIW) delay lines. Such lines are composed of a periodic array of coupled square split ring resonators ...

    • 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 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 ...