We study on microstrip transmission lines loaded by SRR structures in various types, numbers and topologies. We basically observe the effects of SRR number, SRR geometry and the other design parameters on insertion loss (i.e., magnitude of S21 in dB). We present that SRR loaded transmission lines behave as a band stop filter and increasing number of elements decreases the insertion loss. Moreover, changing SRR design parameters effects the location of the resonance frequency.