In this paper, a compact, wide fractional bandwidth bandpass fllter using a new open slot split ring resonator (OSSRR) defected ground structure and compact microstrip resonating cell (CMRC) is presented. OSSRR is the modifled and dual version of the open split ring resonator (OSRR). The band pass fllter (BPF) is constructed by cascading lowpass and highpass sections designed using CMRCs and OSSRR respectively. The designed BPF has wide fractional bandwidth of 74%, sharp passband to stopband transition and low passband insertion loss of less than 1dB. The simulated results are well validated by the experimental results.