This paper presents the design and analysis of a star-shaped microstrip antenna for most of SHF bandapplications. The antenna size is 25x15 x1.524 mm. Multiple rectangular slots at one side of a partial ground plane were employed to enhance the bandwidth and gain of the antenna. The effect of changing slot length and width was studied. Good radiation properties over the frequency range from 3.9GHz to 24GHz were obtained. The antenna was designed and simulated using High Frequency Structure Simulator HFSS software packages.