This paper asserts the study of a square shaped micro-strip patch antenna with Ultra-wideband characteristics. The antenna is composed of micro-strip line fed tosquare patch and lopsided shaped substrate. Various dielectric substrates are examined for the better performance and eventually used FR4-lossy as a substrate. Gain parameter, far-field radiation patterns and Voltage Standing Wave Ratio values are calculated and graphically represented at frequencies 3 GHz and 10 GHz respectively. It is shown that proposed antenna with escalated dimensions and copper as dielectric substrate has very low Return losses and high gain parameter for a Impedance bandwidth of 3 to 10 GHz at VSWR=1 in CST Microwave studio 2014