Abstract: Reflected from anisotropic metamateiral slab, polarization states of electromagnetic wave can be ma- nipulated with great freedom, and may have complete polarization conversion under certain conditions. In this paper we present our designing and performing of an experiment aimed at measuring the polarization conversion of electro- magnetic wave, based on the laboratory＇s microwave system. We show the result of our experiment as we found con- siderable polarization conversion at certain frequencies. We also purpose a new approach to enhance the polarization conversion ratio （PCR） and have testified it through experiment. Numerical simulations are employed to compare with the experimental result.

Key words: metamaterial, anisotropy, polarization conversion