An Ultra-wideband Printed Monopole Antenna with Dual Band-Notched Characteristics Using DGS and SRR

An ultra-wideband printed monopole antenna with dual band-notched characteristics is presented. The antenna consists of a split ring resonator (SRR) on the circular patch and defected ground structure (DGS) and symmetrical-slits in the coplanar ground plane. It is designed for avoiding interference with Worldwide Interoperability for Microwave Access (Wi-Max) (3.4 – 3.69 GHz) and Wireless Local Area Networks (WLAN) (5.15 – 5.825 GHz). Predicted impedance bandwidth of antenna is 2.70 – 10.67 GHz, for VSWR < 2. Incorporation of DGS and SRR results in dual band-notched bandwidth from 3.30 GHz – 3.86 GHz and 5.28 – 5.89 GHz respectively. The gain of antenna varies 2.48 dBi to 4.72 dBi over the operating bandwidth. In the band notched regions, the gain reduces from its normal value to about 7.94 dBi at 3.64 GHz while it reduces by 4.27 dBi at 5.67 GHz.