A Printed Fractal Based Slot Antenna for Multi-band Wireless Communication Applications

Difierent slot structures have been widely used in numerous designs to produce antennas with enhanced bandwidths. In this paper, a printed slot antenna has been introduced as a candidate for use in the multi-band wireless communication applications. The antenna slot structure has a rectangular shape with its width, from the side of feed, has been modifled in the form of Koch fractal curve of the second iteration. The antenna has been fed with 50Ohm mi- crostrip transmission line etched on the reverse side of the substrate. Modeling and performance evaluation of the proposed antenna design have been carried out using a method of moments based EM simulator, IE3D. Simulation results show that the resulting antenna exhibits a multi- resonant behavior making it suitable for a wide variety of multi-band wireless communication applications. The flrst resonant band, centered at 2.58GHz, extends from 2.40 to 2.89GHz. This band covers the 2.4GHz WLAN band (frequency range 2.4{2.483GHz) and the 2.5GHz mobile WiMAX operating band (frequency range 2.5{2.7GHz). The second resonant band, centered at 4.03GHz, extends from 3.40 to 4.50GHz. This band covers the 3.5GHz mobile WiMAX oper- ating band (frequency range 3.4{3.6GHz). While the third resonant band centered at 5.74GHz, extends from 5.42 to 6.18GHz. This band covers the U-NII mid-band (frequency range 5.47{ 5.725GHz) and U-NII high-band (frequency range 5.725{5.875GHz). Parametric study has been carried out to explore the efiect of varying the antenna feed line length on its performance.

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