Switchable filtennas with sharp dual bandnotch using looped resonators

Abstract

This paper proposes a reconfigurable/switchable UWB filtenna with sharp dual bandnotch at WiMAX 3.5 GHz and WLAN 5.8 GHz bands. The filtenna is formed by placing three looped resonators in an UWB antenna. The resonators are fitted with Graphene based switches and PIN diodes which introduce reconfigurability. The filtenna was simulated and measured in switch OFF and ON states. Results show a measured passband from 2.8–11.97 GHz in OFF state and ON state results in sharp dual bandnotch within the passband at 3.49 GHz and 6.15 GHz at a return loss of 2.2–2.5 dB. The gain and efficiency in both states has also been given and is reduced in ON state at the dual bandnotch. Surface currents at the dual bandnotch and the radiation patterns in E- and H-planes have also been presented.