Browsing by Subject "Omega media"
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Item Open Access Experimental and numerical study of omega type bianisotropic metamaterials combined with a negative permittivity medium(Elsevier BV, 2008) Aydin, K.; Li, Z.; Bilge, S.; Özbay, EkmelWe report on the transmission properties of the omega (Ω) type metamaterials. Transmission through the periodic Ω-only and Ω-wire metamaterials are studied experimentally and numerically. A resonance band gap is observed for the periodic Ω medium around the resonance frequency of the single Ω unit cell. A transmission band is observed below the resonance band gap, when the periodic Ω structure is embedded in a negative permittivity medium composed of thin metallic wire arrays. We also studied the effect of periodicity on the transmission spectra of Ω type metamaterials.Item Open Access Retrieval of effective parameters for bianisotropic metamaterials with omega shaped metallic inclusions(Elsevier, 2011-11-18) Li, Z.; Aydin, K.; Özbay, EkmelBianisotropic metamaterials including Ω-shaped metallic elements are investigated experimentally and theoretically. A passband is observed for a composite metamaterial (CMM) based on an Ω-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 Ω-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.