The main objective of this article is to design, realize and measure the performance of a reconfigurable antenna for wireless applications. The designed antenna will be able to switch among several modes, from the ultra-wideband mode (UWB mode) to narrow band mode (NB mode) and then to dual-band mode (Bi-bands mode) and vice versa in order to combine the maximum functionality. BBy incorporating two resonators into the octagonal antenna, the initial antenna can be covered by one wideband (UWB mode), one narrow sub-band (NB mode), or two narrow sub-bands (Bi-bands mode). The ultra-wideband mode is obtained by deactivating the two resonators (so the antenna operates as a classical octagonal antenna), while the one narrow band mode is obtained by activating just one resonator. In the bi-bands mode, the two resonators are activated at a time to be used as a couplingbridge to very narrow frequency bands. To present the work, simulated and measured results are given and discussed.

A reconfigurable octagonal antenna with a capability to operate in ultra-wideband (UWB), narrowband (NB) or bi-bands is presented. By incorporating two resonators, computation between the proposed modes becomes possible using the PIN diode switches. The UWB mode is obtained by deactivated the two resonators, while the one NB mode, is gotten by activated just one resonator. In the case of the activation of the two resonators at the same time, the antenna will be operating in the bi-bands mode. The prototype has been simulated and measured. Both simulation and measurement have shown the same results and characterize a reconfigurable behavior, necessary for wireless applications.