Design of Stair cased Square Fractal Antenna for Multiband Applications

A novel design of fractal antenna is designed using Sierpinski carpet geometry and its various characteristics are investigated in this paper. Proposed antenna is designed on low cost easily available FR4 glass epoxy substrate with relative permittivity of 4.4 and a thickness of 1.6mm. The antenna is designed and simulated by using High Frequency Structure Simulator (HFSS) version 13. Basic structure of designed antenna is optimized by applying micro strip line feeding technique to achieve the high value of gain and return loss. Simulated results of proposed antenna revels that the antenna works on six frequency bands of operation such as 1.09GHz,3.63GHz,6.18GHz,7.18GHz and 9.18GHz with a value of return loss, gain and VSWR at acceptable level. Antenna is fabricated and tested using VNA (Vector Network Analyzer), which shows that the experimental results are in good agreement with the simulated results. Proposed antenna resonates at six different frequency bands including S band (2 – 4GHz) for WLAN and Bluetooth, High speed wireless Communications (5.92- 8.5GHz) and X band (8-12GHz) for satellite Communications etc. The maximum gain of the proposed fractal antenna can reach 9.08dB.