A modified compact microstrip resonance cell (CMRC) low pass filter (LPF) with ultrawide and deep stopband using novel fractal patches is presented. The proposed filter has a low insertion loss in the passband, good selectivity, ultrawide and deep stopband. The experimental results show a 3-dB cutoff frequency of 2.85 GHz and out-of-band rejection up to 67 GHz with 181.5% relative stopband bandwidth Low pass microstrip filters, ultrawide band, compact microstrip resonance cell (CMRC), fractal.