The aim of this paper is to design a micro strip antennas suitable for Wi-Max based application centered at 5.8 GHz. The antenna must operate within the unlicensed 5.8 GHz band. This band is currently being used for the IEEE 802.11c standard and other industrial, medical and scientific applications. A equilateral triangular micro strip antenna designed with slits, achieved 14.5 percent bandwidth and 3dBi directivity. The antenna covers the 5.8GHz band for Wi-Max with the bandwidth from 5.28GHz to 6 GHz. The antenna designed on FR4 substrate, that had a relative dielectric constant, εr = 4.4, a loss tangent tan δ = 0.009 and thickness, h of 1.59 mm.
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