The radar backscatter from the sea surface plays an important role in ocean observation. Many theoretical models have been developed to accurately estimate the scattering coefficient over the past few decades. A comparison between simulations of different scattering models with three roughness spectra and field measurements in Ku, C, and L bands and several empirical functions is obtained, demonstrating the behavior of normalized radar cross section (NRCS) for different incidence angles, wind speeds, azimuth angles, and frequencies. The verification of RADARSAT-2 measurements to these combinations suggests that NRCS values can be best reproduced in VV polarization by the CB model when the E spectrum is imported, and best in HH and VH polarizations by the SSA2 model with the H2 and E spectra, with a root mean square error (RMSE) of 1.62, 1.57 and 2.10 dB, respectively.