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Mostrando ítems 1-14 de 14

    • 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 ...

    • 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 ...

    • Multifrequency and multifunction metamaterial-loaded printed antennas 

      Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel; Ugarte Muñoz, Eduardo; García Muñoz, Luis Enrique; González Posadas, Vicente (InTech Europe (Rijeka, Croacia), 01/04/2010)

    • Multifrequency printed antennas loaded with metamaterial particles 

      Segovia Vargas, Daniel; Herraiz Martínez, Francisco Javier; Ugarte Muñoz, Eduardo; Montero de Paz, Javier; González Posadas, Vicente; García Muñoz, Luis Enrique (01/06/2009)
      This paper provides a review of printed antennas loaded with metamaterial particles. This novel technique allows developing printed antennas with interesting features such as multifrequency (simultaneous operation over two ...

    • Multifrequency self-diplexed single patch antennas loaded with split ring resonators 

      Montero de Paz, Javier; Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; González Posadas, Vicente; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (01/03/2011)
      In this paper a novel approach to design multifrequency self-diplexed single patch antennas is proposed. This approach is based on a square microstrip patch antenna loaded with split ring resonators (SRRs). The working ...

    • Multifrequency single patch antennas loaded with split ring resonators 

      Montero de Paz, Javier; Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel (Sin editorial (Barcelona, España), 12/04/2010)
      Multifrequency antennas with low frequency ratio between frequencies would be desirable for systems that work on different frequency bands which are very close. In this paper multifrequency single patch antennas loaded ...

    • Patch antenna based on metamaterials for a RFID transponder 

      Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Segovia Vargas, Daniel (01/06/2008)
      In this paper a self-diplexed antenna is proposed for a RFID transponder application. The development cycle is divided into two stages: antenna design and filters design. The antenna is based on a square microstrip patch ...

    • Patch antennas partially filled with CRLH cells for self-diplexed antennas for RFID application 

      Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Segovia Vargas, Daniel (Sin editorial (Ámsterdam, España), 27/10/2008)
      In this paper two dual-frequency (2.45 GHz and 1.72 GHz) self-diplexed two-port antennas based on patches partially filled with CRLH cells are proposed. The polarization at both ports can be either equal or orthogonal ...

    • Planar superstrate for dual-frequency RHCP-LHCP array 

      Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; Montero de Paz, Javier; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (01/06/2011)
      Patch antennas are low profile, lightweight and most suitable for aerospace and mobile applications. In recent years Fabry-Pérot cavities and meta-surfaces have been used as superstrates to improve the radiation performance ...

    • Planar superstrate made with meta-material particles for dual-polarized dual-frequency antennas and circularly polarized antennas 

      Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; Montero de Paz, Javier; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (Sin editorial (Toronto, Canadá), 11/07/2010)
      In recent years, two-dimensional arrangements of metamaterial particles have been used as superstrates to overcome the main disadvantages of planar antennas (mainly patch antennas or printed dipoles) such as, low directivities ...

    • Quad-frequency linearly-polarized and dual-frequency circularly-polarized microstrip patch antennas with CRLH loading 

      Segovia Vargas, Daniel; Herraiz Martínez, Francisco Javier; Ugarte Muñoz, Eduardo; García Muñoz, Luis Enrique; González Posadas, Vicente (01/01/2013)
      In this paper, a novel technique to develop multifrequency microstrip patch antennas with polarization diversity or circular polarization is presented. The proposed approach consists of exciting modes with orthogonal ...

    • Self-diplexed antenna based on metamaterials for RFID application 

      Ugarte Muñoz, Eduardo; Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Segovia Vargas, Daniel (Sin editorial (Dubrovnik, Croacia), 24/09/2007)
      In this paper a self-diplexed antenna is proposed for a RFID transponder application. The development cycle is divided into two stages: antenna design and filters design. The antenna is based on a square microstrip patch ...

    • Self-diplexed patch antennas based on metamaterials for active RFID systems 

      Herraiz Martínez, Francisco Javier; Ugarte Muñoz, Eduardo; González Posadas, Vicente; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (01/05/2009)
      This paper presents a full duplex active RF identification system with arbitrary values for any of the two frequencies in the different radio links. First, the antennas proposed in this paper are based on linearly polarized ...

    • Sensitivity and stability analysis of non-foster matched two-port antennas 

      Ugarte Muñoz, Eduardo; Albarracín Vargas, Fernando; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel (Sin editorial (Gotemburgo, Suecia), 08/04/2013)
      During the last years, many researchers have been working in the active marching or non-Foster matching of one-port and two-port electrically small antennas (ESAs). In this paper we present new considerations for the design ...