An octagonal star shaped flexible UWB antenna with band-notched characteristics for WLAN applications

In this paper, a flexible UWB antenna with band notched characteristics for high speed WLAN applications is presented. The flexibility of the designed antenna is achieved by developing the antenna on a flexible Teflon substrate. The proposed antenna primarily consists of a slot loaded octagonal star-shaped patch with a partial ground plane for wide operating bandwidth. A split ring resonator (SRR) based stop band filter is embedded in the ground plane to realize a rejection band characteristic to mitigate the interference impact from wireless local area network (WLAN) IEEE802.11n (5.725-5.825 GHz) band. The measured result shows that the suggested antenna operates over 3.25 to 13 GHz with a fractional bandwidth of about 120% with a peak gain of 6.7 dBi. The measurement results also confirm the presence of the rejection band from 5.7-6.2 GHz. Also, in terms of flexibility, the antenna provides high robustness in the performance for different types of bending conditions. The obtained results depict that the proposed antenna is suitable for mounting on all types of surface area with band rejection characteristics.