Herraiz Martínez, Francisco Javier
Hall, Peter S.
Liu, Qing
Segovia Vargas, Daniel
2017-12-21T15:44:35Z
2017-12-21T15:44:35Z
01/05/2011
0018-926X
http://hdl.handle.net/11531/24683
Artículos en revistas
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 have been developed: the monopole antenna and the half-loop antenna over ground plane. In both cases, the antennas are designed, manufactured and measured at fixed frequencies as a first step. After that, a study to replace some LH components with variable capacitors has been carried out for each antenna. Tunability over a wide bandwidth has been achieved. Finally, some prototypes of both antennas have been manufactured and measured. The tunable LH monopole antenna has been measured showing a monopolar radiation pattern with a 28% tuning bandwidth (695-924 MHz). Its radiation efficiency takes values between 50% and 70% within all the tuning bandwidth and the maximum dimension varies only between 0.11?0 at 695 MHz and 0.15?0 at 924 MHz. The tunable LH half-loop antenna over a ground plane has a radiation pattern with maximum radiation orthogonal to the ground plane. It has a 1.64:1 measured tuning bandwidth properly matched to 50 ? (considering |s11| <; -10 dB). Its measured radiation efficiency is always above 54% within the working bandwidth.
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Revista: IEEE Transactions on Antennas and Propagation, Periodo: 1, Volumen: 59, Número: 5, Página inicial: 1460, Página final: 1471
Instituto de Investigación Tecnológica (IIT)
Left-handed wire antennas over ground plane with wideband tuning
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/restrictedAccess
Left-handed materials, loop antenna, monopole antenna, reconfigurable antennas, tunable antennas.