Experimental Retrieval of the Effective Parameters of Bi-Anisotropic Metamaterials

In order to realize various intriguing applications by metamaterials, it is essential to obtain the effective parameters of the micro-structures composing metamaterials. In this paper, we propose an experimental method to retrieve all of the 16 effective parameters of planar bi-anisotropic metamaterials. The relationship between the scattering matrix and the effective parameters is theoretically proposed and the experimental measurement for the scattering matrix is accomplished. We also show the validity of our retrieval method using two microstructures: the cross and the “wan” shaped microstructures. Compared with previous proposed experimental retrieval methods, our experimental method is more universal and can be applicable to any planar structures.