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Título:	Low-cost mechanism to reconfigure the operating frequency band of a Vivaldi antenna for cognitive radio and spectrum monitoring applications
Autor/a:	Borda Fortuny, Cristina; Tong, Kin-Fai; Chetty, Kevin
Abstract:	A frequency agile Vivaldi antenna whose operating frequency band can be switched between two selected bands is proposed in this study for spectrum monitoring and cognitive radio applications. A radiofrequency (RF) switch is introduced into the back-slot of a Vivaldi antenna to allow switching of the operational band. The realised gains of the antenna are 10.5 dBi in the low band around 3.1 GHz, and 12 dBi in high band around 4.1 GHz. The radiation pattern is stable and its direction is consistent across the two bands. This design can be applied to multiple reconfigurable bands by using more RF switches to tune the desired operating frequency. A set of reliable design equations has been provided as well. This reconfigurable antenna offers improved gain and isolation over multiple, wideband and multiband antennas without increasing the cost and size when compared with those designs reported.
Materia(s):	-Wideband multiband antennas -Radiofrequency switch -Frequency agile Vivaldi antenna -Spectrum monitoring applications -Cognitive radio -Operating frequency band
Derechos:	This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) http://creativecommons.org/licenses/by/3.0/
Tipo de documento:	Artículo Artículo - Versión publicada
Editor:	Institution of Engineering and Technology (IET)
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