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This paper presents a kind of wideband, low-loss left handed transmission line (LHTL). It is composed of a parallel meander inductance and a serial cutting capacitor based on the coplanar waveguide (CPW) transmission line (TL). A better method of parameter extraction is formulated based on a more accurate Nicolson–Ross–Weir (NRW) approach. According to medium theory, the complex effective parameters of permittivity and permeability have been extracted from transmission and reflection scattering matrix. Through extracting the β parameter of the CPW TL, the characteristics of LHTL have been verified. The effective bandwidth is about 100% from 11 GHz to 21 GHz with low loss.