Reconfigurable of Palm Tree Vivaldi Antenna Using Square Ring Resonator for Cognitive Radio Applications

Cognitive radio is an innovation of ICT infrastructure to support antenna operation in Bluetooth, WLAN, and WiMax communications applications. This letter presents a developed palm tree Vivaldi antenna with dimensions of 250 × 250 mm that can operate at a frequency of 0.6–3.4 GHz. The reconfigurable technique is the SRR (Split Ring Resonator), which creates a gap in the antenna design. The SRR form in this letter is DSSR (Double Square Split Resonance) combined with the switching technique using diodes. There are four DSSR placed in the area of the spread path of the electromagnetic field at the tapper slot line. The diode switching technique provides two conditions on or off and diodes attached to the DSSR input. In this letter, there are four modes of diodes that produce frequency changes. The results simulation antennas can operate at 0.5-0.7 GHz, 1.6-2.0 GHz, 2.3-2.6 GHz, 2.5-3.1 GHz, 2.5-3.2 GHz, 3.3-3.4 GHz. The resulting return loss has a notch band area that reduces communication system interference when applied to cognitive radio in the area of WLAN, WiFI, and Bluetooth.