A compact planar micro strip band pass filter with 3.1~10.6 GHz bandwidth is proposed. Filter with in band insertion loss of less than 1 dB, group delay of 0.2~0.6 ns and out band rejection above 10 dB is presented for ultra wideband (UWB) applications. The desired UWB band is realized by fabricating a defected ground structure (DGS) in the bottom of the coupled micro strip lines. A folded stepped impedance stub fabricated on the frontal surface of the micro strip lines and two slots slotted in the metal patches of the DGS offer two transmission zeros at both lower and upper edges of the pass band to improve the pass band selectivity and band rejection significantly. The simulated values and measured parameter values are in good agreement within experimental error.