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Mostrando ítems 1-20 de 21

    • 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 ...

    • 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 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-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 ...

    • 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 ...

    • Hexagonal metallo-dielectric periodic structure: characterization and application 

      Segovia Vargas, Daniel; Herraiz Martínez, Francisco Javier; Iñigo Villacorta, Fernando; González Posadas, Vicente (Sin editorial (Edimburgo, Reino Unido), 11/11/2007)
      A hexagonal metallo-dielectric periodic structure is studied to see the propagation modes in the pass bandwidth. The pass bandwidth is constituted by several resonances that are not associated to the same propagation mode. ...

    • Low-cost approach based on an eigenfrequency method to obtain the dispersion diagram in CRLH structures 

      Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Iñigo Villacorta, Fernando; Segovia Vargas, Daniel (08/01/2007)
      A novel method to obtain the dispersion diagram of a composite right/left-handed (CRLH) unit-cell is presented. This method is based on CRLH transmission-line (TL) theory and on the structure eigenfrequencies. First, it ...

    • Multi-frequency and dual mode patch antennas partially filled with left-handed structures 

      Herraiz Martínez, Francisco Javier; González Posadas, Vicente; García Muñoz, Luis Enrique; Segovia Vargas, Daniel (05/08/2008)
      Multifrequency microstrip patch antennas partially filled with left-handed (LH) structures are presented. The presence of LH structures also enables miniaturized antennas. Thus, multifrequency, dual-mode, and miniaturized ...

    • Multi-frequency microstrip patch antennas based on metamaterial structures 

      Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Segovia Vargas, Daniel (Sin editorial (Honolulu, Estados Unidos de América), 09/06/2007)
      In this paper, CRLH TL based antennas and microstrip patches concepts are merged to design multi-frequency antennas. The proposed antenna works at four different frequencies with non-whole ratio between them. This is ...

    • Multi-frequency printed dipoles loaded with metamaterial particles 

      Herraiz Martínez, Francisco Javier; García Muñoz, Luis Enrique; González Posadas, Vicente; Segovia Vargas, Daniel (Sin editorial (Praga, República Checa), 23/04/2008)
      Multi-frequency printed dipoles based on antipodal printed dipoles loaded with metamaterial particles are presented. Split ring resonators (SRRs) are used as metamaterial particles in order to obtain fully printed and ...

    • 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 ...

    • Multifunction patch antennas filled with metamaterial structures 

      Herraiz Martínez, Francisco Javier; González Posadas, Vicente; Segovia Vargas, Daniel (Sin editorial (Múnich, Alemania), 09/10/2007)
      Microstrip patch antennas filled with metamaterial structures are presented. Multiple operation over several frequencies is shown from transmission line model. The proposed antennas present two dipolar modes (similar to ...

    • 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 ...

    • 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 ...