Multiple fractal-shaped slots-based UWB antenna with triple-band notch functionality

A planar elliptical shape band-notched UWB antenna with multiple fractal-shaped slots and a Sierpinski fractal curve-shaped ring resonator at the back of the substrate is introduced in this paper. The proposed antenna exhibits a triple-band notch characteristic. Koch fractal slot etched from the radiator is responsible for creating notched band centred at 5.5GHz for wireless local area network rejection. The Minkowski fractal slots in the ground planes create rejection characteristics at 8.1GHz to avoid interference with X-band uplink satellite communication systems. The RFID rejection band centred at 6.8GHz is achieved by using a Sierpinski fractal curve-shaped ring resonator at the back of the substrate. Sierpinski fractal slot of third iteration on the radiator contributes to an impedance bandwidth of 2.8-12GHz with VSWR<2 by improving matching at lower frequencies except at three notched bands. The antenna gain varies from 1.5 to 4dBi over the band. Stable radiation patterns are obtained throughout its operating frequency. The antenna has a compact size of 41mmx45mm.