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This paper presents software based analysis on single and dual substrate patch antenna. Using defected ground structure as basic technique, antenna is build up using fractal shape mounted with PI shape on its center. FR4 with relative permittivity of 4.3 is the first and basic substrate in single substrate patch. Air with relative permittivity of 1.00 is used as second substrate in dual patched antenna using stack configuration. In stacked configuration additional shortening pin technique is implemented between patches to enhance gain and directivity. Both in single and stacked feed patches antenna, good return loss, and gain and directivity results are achieved with multi band response. The proposed antennas’ can be used for GSM, GPRS and other communication systems.