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    • 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 ...

    • 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 ...

    • 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 ...

    • Reconfigurable antenna challenges for future radio systems 

      Hall, Peter S.; Gardner, P.; Kelly, James R.; Ebrahimi, Elham; Hamid, M. R.; Ghanem, Farid; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel (Sin editorial (Berlín, Alemania), 23/03/2009)
      Future radio systems, such as software defined radio and cognitive radio concepts give rise to significant challenges for antenna design and in particular reconfigurable antenna design. Whilst there are many possible ways ...

    • 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 ...

    • Small printed log-periodic array, matched with an active non-foster network 

      Albarracín Vargas, Fernando; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel (Sin editorial (París, Francia), 19/03/2017)
      The design of a small printed-log-periodic antenna, loaded with an active matching network, for multiband applications is presented. A well-known, low-cost and low-profile antenna is re-engineered for including an additional ...

    • Small printed log-periodic array, matched with an active non-foster network 

      Albarracín Vargas, Fernando; Herraiz Martínez, Francisco Javier; Segovia Vargas, Daniel
      The design of a small printed-log-periodic antenna, loaded with an active matching network, for multiband applications is presented. A well-known, low-cost and low-profile antenna is re-engineered for including an additional ...

    • 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 ...

    • Split-ring resonator-based sensor for thin-film sensing applications 

      Galindo Romera, Gabriel; Herraiz Martínez, Francisco Javier; Gil Barba, Marta; Martínez Martínez, José Juan; Segovia Vargas, Daniel
      A Split-Ring Resonator (SRR) based sensor for the detection of solid thickness is proposed. The structure is composed by a host microstrip transmission line loaded with two SRRs. The sensing principle is based on the ...

    • Submersible printed split-ring resonator -based sensor for thin-film detection and permittivity characterization 

      Galindo Romera, Gabriel; Herraiz Martínez, Francisco Javier; Martínez Martínez, José Juan; Segovia Vargas, Daniel (15/05/2016)
      A split-ring resonator (SRR)-based sensor for the detection of solid thickness and relative permittivity characterization of solid and liquid materials is proposed. The structure is composed of two SRRs hosted in a microstrip ...

    • Tunable left-handed monopole and loop antennas 

      Herraiz Martínez, Francisco Javier; Hall, Peter S.; Liu, Qing; Segovia Vargas, Daniel (Sin editorial (Charleston, Estados Unidos de América), 01/06/2009)
      Left-handed (LH) loading has been applied to printed wire antennas, such as dipole antennas and the loop antenna. These antennas are based on periodic LH cells. The resonant frequency depends on the components of the LH ...