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    Öğe
    Calibration-free extraction of constitutive parameters of magnetically coupled anisotropic metamaterials using waveguide measurements
    (Amer Inst Physics, 2017) Hasar, Uğur Cem; Buldu, Gül; Bute, Musa; Muratoğlu, Abdurrahim
    A calibration-free method for extraction of electromagnetic properties of magnetically coupled anisotropic biaxial metamaterial (MM) slabs from waveguide measurements is proposed. It relies on three measurement steps (thru, empty line, and the same line arbitrarily loaded by the MM slab) to extract electromagnetic properties. It is evaluated against another calibration-dependent method for retrieval of electromagnetic properties of a MM slab constructed by C-shaped resonators. From evaluation analysis, we note that our method, as compared to the calibration-dependent method, not only accurately extracts electromagnetic properties without requiring the use of expensive calibration standards but also is reference-invariant. Published by AIP Publishing.
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    Öğe
    Reference-plane-invariant waveguide method for electromagnetic characterization of bi-axial bianisotropic metamaterials
    (Elsevier B.V., 2018) Hasar, Ugur Cem; Yildiz, Gul; Bute, Musa; Muratoglu, Abdurrahim
    In this paper, we investigate a reference-plane invariant (RPI) method for electromagnetic property extraction of bi-axial bianisotropic metamaterial (MM) slabs. In order to obtain unique properties, we applied the frequency varying technique in order to determine the location of the slab within its cell. For validation of the proposed method, we first simulated and then measured scattering parameters of a MM slab constructed by split-ring-resonators, next extracted its electromagnetic properties, and finally compared extracted properties by those retrieved by another method which requires reference-plane information. From the comparison, we noted that whereas our proposed method correctly retrieved electromagnetic properties without knowing the value of reference plane transformation factors, the accuracy of the tested method was seriously influenced by any inaccurate reference plane information. © 2018 Elsevier B.V.