Hexagonal boundary Sierpinski carpet fractal shaped compact ultrawideband antenna with band rejection functionality

Abstract: In this paper a second iteration Sierpinski carpet fractal shape UWB antenna with hexagonal boundary is presented. The antenna covers the frequency band from 3GHz to 12GHz (VSWR≤2). The proposed antenna has the capability to reject 5.15–5.825GHz band assigned for IEEE802.11a and HIPERLAN/2 which is achieved by embedding a ‘Y’ shaped slot in the radiator that extends to the central conductor of the CPW feed as well. A fabricated prototype is developed where the simulation and experimental results are in good agreement. Measured peak antenna gain varies from 1.25dBi to 6dBi within the band. The proposed antenna has a compact size of 33mm×32mm that includes the substrate around the radiating element. Time domain characteristic reveal that the antenna is non-dispersive with a variation of measured group delay within 0.5ns over the entire band. [Copyright &y& Elsevier]