Retrieval of effective parameters for bianisotropic metamaterials with omega shaped metallic inclusions

Bianisotropic metamaterials including Omega-shaped metallic elements are investigated experimentally and theoretically. A passband is observed for a composite metamaterial (CMM) based on an Omega-medium below the plasmonic frequency of the corresponding closed CMM. The effective parameters (refractive index, impedances, permittivity, permeability, and magnetoelectric coupling coefficient) are retrieved for the Omega-medium and the CMM based on it. Our retrieval results show that the passband observed for the CMM is a band with positive refractive indices. Our retrieval results confirm the deductions of our previous reports. (C) 2011 Elsevier B.V. All rights reserved.