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Mostrando ítems 1-17 de 17

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 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 ...

    • 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 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 ...

    • Some Spanish contributions to UHF dense arrays (SKA project) and THz imaging arrays 

      Segovia Vargas, Daniel; Herraiz Martínez, Francisco Javier; García Muñoz, Luis Enrique; García Castillo, Luis Emilio; Acedo Gallardo, Pablo; Ederra, Iñigo; Palacios, Inés; Gonzalo García, Ramón (Sin editorial (Nagoya, Japón), 29/10/2012)
      The current paper presents some of the most important contribution to antenna arrays for radioastronomy, biology and security applications in Spain from the Universidad Carlos III de Madrid and the Universidad Publics de ...