Abstract:
The paper presents the design and the implementation of a reduced-size antipodal Vivaldi antenna with a reconfigurable band notch. The antenna could be mainly used for UWB applications since it covers a very wide frequency band. It is also suitable for Cognitive Radio (CR) systems because it is capable to sense the spectrum to determine the bands used by primary users, and to communicate pulses that ensure interference avoidance to primary users. For that, a reconfigurable band stop filter, based on three nested complementary split-ring resonators (CSRRs), is integrated on the ground plane. The band notch occurs at 3.5 GHz, 5.2 GHz or 7.3 GHz, and is controlled using electronic switches.