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Mostrando ítems 1-4 de 4

    • 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 ...

    • Left-handed wire antennas over ground plane with wideband tuning 

      Herraiz Martínez, Francisco Javier; Hall, Peter S.; Liu, Qing; Segovia Vargas, Daniel (01/05/2011)
      Tunable left-handed (LH) wire antennas over a ground plane are presented in this paper. These antennas are small and have a wide tuning bandwidth and are matched to 50 ? within the operation range. Two kinds of antennas ...

    • 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 ...

    • 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 ...