HEXAGONALSLOTANTENNAWITHDUALBANDNOTCHEDCHARACTERISTICSFOR UWBAPPLICATIONS

Printed hexagonal slot antenna with dual band stop characteristicsforultra widebandapplications is presented in this paper. The basic antenna comprises U-shape radiating patch and ground plane with hexagonal slot. By proper alignment and use of hexagonal slot additional resonances and much wider impedance bandwidth isobtained. By embedding invertedL-shape parasitic stubs at the upper edge at the hexagonal slot,obtain the desired band rejection characteristics for WiMAX and WLAN respectively. The operating frequency of proposed antenna is ranged from 2.76~ 11.07GHz with a dual band rejection from 3~4GHz (for WiMAX) and 5~6GHz (for WLAN).The designed antenna is fabricated on a FR-4 glass epoxy substrate having dielectric constant of 4.4 with overall dimensions of 28 x 28 x 1.6mm3. Parametric studies have been conducted by changing length ofinverted L-shape parasitic stubsand it is conducted using CADFEKO 7.0 simulation software. Designed antenna exhibits good radiation pattern, efficiency greater than 75% within the entire ultra wideband except for WiMAX and WLAN frequency.