A X-Band microstrip filter for the reduction of size, to improve the rejection in band using modified defected ground structure (DGS) is proposed. Here different types of uniform and non-uniform DGS and its equivalent lumped L-C circuit model are presented for the parametric relationship and the comparison of pass-band in-between the rejection bands. Then an improved defected ground structure (DGS) with compensated microstrip line is investigated for band pass filter (BPF) for the uplink frequency at X-band. © 2015 IEEE.