Application of a Useful Uncertainty Analysis as a Metric Tool for Assessing the Performance of Electromagnetic Properties Retrieval Methods of Bianisotropic Metamaterials

Hasar, Uğur Cem; Barroso, Joaquim J.; Ertuğrul, Mehmet; Sabah, Cumalı; Çavuşoğlu, Bülent

doi:10.2528/pier12040802

Cited by 12 publications

(12 citation statements)

References 39 publications

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“…This effect of σ is in complete agreement with quality factor of resonating structures, where loss present inside them decreases their resonance behavior, since MM slabs in Fig. 1 can be considered as resonating structures [29,30]. In the dependencies in Figs.…”

Section: First Analytical Approach -Reference-plane Dependentsupporting

confidence: 73%

“…Whereas periodic boundary conditions are used along x-and y-directions, waveguide ports are assumed along z-direction. For more details about simulations, the reader can refer to [29]. For conciseness, simulated S-parameters over f = 2-5 GHz of the SRR and Composite MM slabs with substrate conductance (σ) of 0.0068 S/m and L 1 = 0 = L 2 are given in Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…d) Effects of offsets from true of L 1 and L 2 are generally lower near resonance region for Composite MM slabs than for SRR MM slabs (Figs. 5 and 6) because inclusion of metallic lossy cut wire decreases quality of the resonating Composite MM slab, reducing the frequency rate of change of S-parameters and thus ε r and µ r [29]. e) We note from Figs.…”

Section: First Analytical Approach -Reference-plane Dependentmentioning

confidence: 99%

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Retrieval of Effective Electromagnetic Parameters of Isotropic Metamaterials Using Reference-Plane Invariant Expressions

Hasar¹,

Barroso²,

Sabah³

et al. 2012

PIER

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Abstract-Three different techniques are applied for accurate constitutive parameters determination of isotropic split-ring resonator (SRR) and SRR with a cut wire (Composite) metamaterial (MM) slabs. The first two techniques use explicit analytical calibrationdependent and calibration-invariant expressions while the third technique is based on Lorentz and Drude dispersion models. We have tested these techniques from simulated scattering (S-) parameters of two classic SRR and Composite MM slabs with various level of losses and different calibration plane factors. From the comparison, we conclude that whereas the extracted complex permittivity of both slabs by the analytical techniques produces unphysical results at resonance regions, that by the dispersion model eliminates this shortcoming and retrieves physically accurate constitutive parameters over the whole analyzed frequency region. We argue that incorrect retrieval of complex permittivity by analytical methods comes from spatial dispersion effects due to the discreteness of conducting elements within MM slabs which largely vary simulated S-parameters in the resonance regions where the slabs are highly spatially dispersive.

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Section: First Analytical Approach -Reference-plane Dependentsupporting

confidence: 73%

Section: Simulation Resultsmentioning

confidence: 99%

Section: First Analytical Approach -Reference-plane Dependentmentioning

confidence: 99%

See 1 more Smart Citation

Retrieval of Effective Electromagnetic Parameters of Isotropic Metamaterials Using Reference-Plane Invariant Expressions

Hasar¹,

Barroso²,

Sabah³

et al. 2012

PIER

Self Cite

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“…This change in a resonance frequency (either to lower frequencies or higher frequencies) could also be an indication of bianisotropic property of the analyzed MM slab for the following reasons. First, any additional loss (wire strip) present inside a resonating structure, such as MM slabs decreases resonance frequency as well as quality factor of the resonating structure [50][51][52]. Second, a wire strip is effective in producing additional electric resonances [9] to the analyzed MM slab at microwave frequencies (see Figs.…”

Section: Cell Dimensions and Simulation Of S-parametersmentioning

confidence: 99%

Stepwise technique for accurate and unique retrieval of electromagnetic properties of bianisotropic metamaterials

et al. 2013

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Metamaterials (MMs) are artificial materials that have received attention recently because their built-in features create collective electromagnetic effects that are otherwise impossible, such as negative refraction, and because of their exotic electromagnetic applications, namely, perfect lens and invisibility cloaks. Depending on wave propagation characteristics, MMs possessing normally weak magneto-electric coupling coefficients start to exhibit stronger bianisotropic effects. Therefore, accurate electromagnetic characterization of these MMs is important. In this study, we adapt a stepwise method based on the Nicolson-Ross-Weir technique for accurate and unique retrieval of electromagnetic properties of bianisotropic MM slabs. For this goal, we have derived explicit expressions for unique retrieval of electromagnetic properties of these slabs and compared these expressions with those in the literature in the retrieval process. From the comparison, we note that derived expressions are appropriate for unique determination of electromagnetic properties of bianisotropic MM slabs. In the performance analysis of the stepwise method for different measurement scenarios, we considered different bianisotropic MM cell configurations (split-ring and Omega-shaped resonators as well as the same resonators with wire strips) and extracted their electromagnetic properties when measured/simulated scattering parameters have some thermal noise. We note that for most of the frequencies, the stepwise method retrieves correct electromagnetic properties even when a relatively higher normally distributed noise with zero mean value and with standard deviations of 0.015 is present. In addition to the influence of thermal noise on performance of the stepwise method, we also analyzed the effect of both increasing length slab and the frequency band on retrieved electromagnetic properties of the analyzed various bianisotropic MM slabs.

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“…MTMs have gained considerable attention [1][2][3][4][5][6][7][8][9][10] due to their unusual features and beneficial applications in numerous devices for different regimes of EM spectrum [11][12][13][14][15]. The concept was started by Veselago in 1968 [16] and continued with the studies of Pendry and his colleagues [17].…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Polarization Independent Metamaterial Absorber Based on Omega Resoanator and Octa-Star Strip Configuration

Dinçer¹,

Karaaslan²,

Ünal³

et al. 2013

PIER

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Abstract-Dual-band metamaterial absorber (MA) with polarization independency based on omega (Ω) resonator with gap and octastar strip (OSS) configuration is presented both numerically and experimentally. The suggested MA has a simple configuration which introduces flexibility to adjust its metamaterial (MTM) properties and easily re-scale the structure for other frequencies. In addition, the dualband character of the absorber provides additional degree of freedom to control the absorption band(s). Two maxima in the absorption are experimentally obtained around 99% at 4.0 GHz for the first band and 79% at 5.6 GHz for the second band which are in good agreement with the numerical simulations (99% and 84%, respectively). Besides, numerical simulations validate that the MA could achieve very high absorption at wide angles of incidence for both transverse electric (T E) and transverse magnetic (T M ) waves. The proposed MA and its variations enable myriad potential applications in medical technologies, sensors, modulators, wireless communication, and so on.

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Application of a Useful Uncertainty Analysis as a Metric Tool for Assessing the Performance of Electromagnetic Properties Retrieval Methods of Bianisotropic Metamaterials

Cited by 12 publications

References 39 publications

Retrieval of Effective Electromagnetic Parameters of Isotropic Metamaterials Using Reference-Plane Invariant Expressions

Retrieval of Effective Electromagnetic Parameters of Isotropic Metamaterials Using Reference-Plane Invariant Expressions

Stepwise technique for accurate and unique retrieval of electromagnetic properties of bianisotropic metamaterials

Dual-Band Polarization Independent Metamaterial Absorber Based on Omega Resoanator and Octa-Star Strip Configuration

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