The scattering parameters of the micrometer sized split ring resonators (SRR) samples are measured in the frequency range of 0.1 to 2 THz. The incident wave with different polarization directions producs an single electric resonance or both electric and magnetic resonances simultaneously in the normal incidence case. The effect of the material conductivity on the resonant frequency of SRRs is discussed. Based on the simulation results, the relationship between the effective permeability and permittivity and the frequencies are shown, and the curve of resonance frequencies with respect to the different size enlargement factors (k) of the SRR unit is plotted. Both the experimental and the simulation results indicate that the electric and magnetic resonance frequencies linearly depend on 1/k.