A reconfigurable band-rejection filtenna using open stub for ultra wideband (UWB) applications

In this paper, design of a filtenna with reconfigurable band-rejection for Ultra Wideband (UWB) communication applications is presented. The proposed antenna is a simple circular radiation patch structure with half ground plane. The band-rejection characteristics is achieved by integrating straight open stub in the feed line to overcome the interference Wireless Local Area Network (WLAN) that operated in the UWB frequency band. One RF switches is mounted at the open stub to active and deactivate the corresponding band-notch and hence band-rejection reconfigurability is achieved. Two reconfigurable states are achieved in the UWB frequency band which during the ON state the presented antenna is capable to operate in the WLAN band-rejection mode while during the OFF state it is capable to operate in full FCC band. The proposed antenna shows the wide impedance bandwidth with WLAN band rejection and multifunction switchable properties.