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A new design of a coplanar waveguide (CPW)-fed folded slot antenna is presented which is suitable for ultra-wide band application. Antenna impedance and bandwidth are studied as function of slot parameters, substrate dielectric constant, and substrate thickness. Wideband operation is achieved by designing an adjacent semicircular slot to a folded slot antenna. A prototype antenna was fabricated on RO4003 (εr = 3.38, substrate thickness = 7.5 mm) and measured for VSWR characteristics. The antenna can operate in the 4.1-7.7 GHz frequency range and has a bandwidth of 61% within 2:1 VSWR.