Determination of Effective Constitutive Parameters of Inhomogeneous Metamaterials With Bianisotropy

Hasar, Uğur Cem; Buldu, Gul; Kaya, Yunus; Öztürk, Gökhan

doi:10.1109/tmtt.2018.2846726

Cited by 35 publications

(11 citation statements)

References 46 publications

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“…5(e) of the two-layer inhomogeneous structure and its simulated one. We suspect that the main reason for such a discrepancy is the coupling effect between resonating SRR-Wire and Omega MM slabs which effect the electromagnetic response of individual MM slabs as well as of the whole structure [31], [33]. Finally, the SRR-Wire MM slab and the Omega MM slab behave almost indistinguishable for the parallel polarization in terms of their extracted electromagnetic properties in Figs.…”

Section: B Simulation Resultsmentioning

confidence: 97%

“…PEC material (E t = 0) was located right at the end of each structure at z = The first inhomogeneous structure (m = 2) consists of a metamaterial (MM) unit cell consisting of split-ring resonators (SRRs) with wire and FR4 material (d 2 = 2.0 mm, ε r,F R4 = 4.4(1 − j0.02), and µ r,F R4 = 1). The geometry of the MM cell is identical to that considered in our previous study [33] except that the slit axis of SRRs is rotated by 90 degrees. The SRR MM slab will exhibit electric coupling when the electric field is normal to the slit axis (y axis in Figs.…”

Section: B Simulation Resultsmentioning

confidence: 99%

“…for the perpendicular polarization [31], [33] and denotes the overall reflection coefficient of a structure composed by the layer s + 1 to the short-circuit termination; Γ…”

Section: A Perpendicular Polarizationmentioning

confidence: 99%

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Method for Electromagnetic Property Extraction of Sublayers in Metal-Backed Inhomogeneous Metamaterials

et al. 2020

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A scattering (S-) parameter method has been proposed for electromagnetic property extraction of a target layer within metal-backed inhomogeneous metamaterial (MM) structures. It relies on recursive S-parameters for two different polarizations (parallel and perpendicular). Two different algorithms depending on the value of the incidence angles were proposed to add flexibility to our method. The algorithms were first validated by a metal-backed quasi-one-port method applicable only for one-layer (homogeneous) samples. Then, they were applied to extract electromagnetic properties of the split-ringresonator-wire MM slab of a metal-backed two-layer inhomogeneous structure and the Omega MM slab of a metal-backed four-layer inhomogeneous structure, and extracted properties by our algorithms were compared with those retrieved by different methods applicable for homogeneous samples only. The accuracy of our method was also examined when there was some noise in S-parameters, when there was a misalignment in incidence angles, and a when large value of iteration number was used. INDEX TERMS Metamaterials, inhomogeneous, recursive algorithm, retrieval, constitutive parameters, metal-backing.

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Section: B Simulation Resultsmentioning

confidence: 97%

Section: B Simulation Resultsmentioning

confidence: 99%

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Method for Electromagnetic Property Extraction of Sublayers in Metal-Backed Inhomogeneous Metamaterials

et al. 2020

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“…To extract the effective constitutive parameters of bianisotropic materials, various techniques such as stepwise method, S-parameters method, resonator method, coaxial probe method, free-space characterization method, rectangular waveguide measurements and recursive algorithms have been employed [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Complex Bianisotropy Effect on the Propagation Constant of a Shielded Multilayered Coplanar Waveguide Using Improved Full Generalized Exponential Matrix Technique

et al. 2020

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A theoretical study of the electromagnetic propagation in a complex medium suspended multilayer coplanar waveguide (CPW) is presented. The study is based on the generalized exponential matrix technique (GEMT) combined with Galerkin’s spectral method of moments applied to a CPW printed on a bianisotropic medium. The analytical formulation is based on a Full-GEMT, a method that avoids usual procedures of heavy and tedious mathematical expressions in the development of calculations and uses matrix-based mathematical expressions instead. These particularities are exploited to develop a mathematical model for the characterization of wave propagation in a three-layer shielded suspended CPW structure. This study is based on the development of mathematical formulations in full compact matrix-based expressions resulting in Green’s functions in a matrix form. The implemented method incorporates a new accelerating procedure developed in the GEMT which provides an initial value used to speed up searching for the exact solution in the principal computation code. This helped us to obtain accurate solutions with tolerable computing time. Good agreements have been achieved with the literature in terms of accuracy and rapid convergence. The results for different cases of bianisotropy have been investigated, and particularly, the effect on the dispersion characteristics is presented and compared with the isotropic case.

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“…To confirm their relationship, therefore, many researchers have dedicated themselves to studying the effective constitutive parameters of metasurfaces or metamaterials. Many extraction methods have been reported in the previous studies, [22][23][24][25][26][27][28][29][30][31] which promote the development of metasurfaces. The enormous number of the effective-parameters retrieval theories makes it possible to precisely manipulate the phase compensation of the unit cells in metasurfaces.…”

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confidence: 99%

Terahertz Near‐Field Metasurfaces: Amplitude–Phase Combined Steering and Electromagnetostatic Dual‐Field Superfocusing

Han

Liu

2020

Advanced Optical Materials

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Subwavelength resolution imaging entails a sharpened superfocusing to overcome the diffraction limit. However, conventional high‐numerical‐aperture superfocusing lenses are bulky and expensive. Relying on the abrupt amplitude and phase discontinuities, metasurfaces have been recently explored as an ultrathin platform to generate arbitrary wavefronts over subwavelength thicknesses. In this paper, a dual‐field superfocusing is demonstrated for terahertz wavelengths using a near‐field metasurface by simultaneously tailoring the amplitude and phase of the evanescent field, which satisfies both electrostatic and magnetostatic limits. A combined analytic theory is introduced to describe the physical mechanism and the entire design process of the near‐field metasurface. With three‐layer minuscule elements characterized by extremely small electric sizes, the metasurface can force both incident electric and magnetic fields to converge to a sharpened focus spot (0.066 and 0.045 wavelength focus spots at a distance of 0.073 wavelength) through radiationless electromagnetic interference. Practical implementations of these metasurfaces hold promise for near‐field terahertz beam steering, laser‐based microscopy, noncontact sensing, imaging, and lithography applications.

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Determination of Effective Constitutive Parameters of Inhomogeneous Metamaterials With Bianisotropy

Cited by 35 publications

References 46 publications

Method for Electromagnetic Property Extraction of Sublayers in Metal-Backed Inhomogeneous Metamaterials

Method for Electromagnetic Property Extraction of Sublayers in Metal-Backed Inhomogeneous Metamaterials

Complex Bianisotropy Effect on the Propagation Constant of a Shielded Multilayered Coplanar Waveguide Using Improved Full Generalized Exponential Matrix Technique

Terahertz Near‐Field Metasurfaces: Amplitude–Phase Combined Steering and Electromagnetostatic Dual‐Field Superfocusing

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