Inhomogeneous media characterization: a hybrid method of state space and frequency diversity

Baharian, Mohammad; Abdolali, Ali; Zarifi, Davoud

doi:10.1007/s00339-017-0999-x

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…On contrary, if the material will be characterized over a broadband frequency using a relatively accurate measurement method, then non-resonant methods are the first choice [7]- [49], [52]- [57]. Besides, frequencydomain [7]- [51] or time-domain [52]- [57] measurements could be carried to characterize the material under test. Timedomain measurements are based on the measurement of wave travel and attenuation of a short-duration pulse incident on the material.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…We comprehensively discussed the feasibility of the proposed approach through two different realization schemes and the uncertainty analysis. It should be noted that even though our demonstrations were presented for the X‐band waveguide setup, the proposed material characterization method can also be applied for sheet resistance extraction [ 63 ] and metasurface susceptibility derivation, [ 8 ] complex (anisotropic, inhomogeneous, and chiral) materials, [ 64–66 ] extended to free‐space configurations, and even, acoustic platforms. The time‐modulated material characterization technique was verified through both numerical and experimental procedures.…”

Section: Resultsmentioning

confidence: 99%

Time‐Modulated Metasurface‐Assisted Measurements

Ghasemi

Rajabalipanah

Tayarani

et al. 2021

Advanced Optical Materials

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This paper explores time‐modulated metasurface‐assisted waveguide setups for the unique and accurate permittivity and permeability extraction of lossy dispersive samples with phase‐less measurements. It is theoretically demonstrated that when the position of the short‐circuit termination is dynamically modulated in a predefined way, the phase information of the reflection S‐parameter manifests itself into the amplitude level of the emerging harmonics. Being insensitive to the calibration plane shifts and phase uncertainties in reflection measurements while bypassing a priori knowledge about the material under test (MUT) and also the transmission information, can be regarded as the main advantages of the proposed time‐modulated material characterization approach. Using a simple post‐processing step, several illustrative examples are presented to numerically verify the validity of the proposed approach for some applicable and practical types of homogeneous materials. Two possible realization schemes based on mechanical actuation and electrical phase control are comprehensively discussed. An uncertainty analysis to examine how realization tolerances can affect the accuracy of results is also performed. The effectiveness of the proposed method is further experimentally demonstrated using a programmable phase‐agile metasurface. By involving the temporal dimension, the proposed strategy takes a great step forward in the phase‐less reconstruction of electromagnetic parameters.

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“…The feasibility of the proposed approach was comprehensively discussed through two different realization schemes and the uncertainty analysis. We note that even though our demonstrations are presented for X-band waveguide setup, the proposed material characterization method can also be applied for sheet resistance extraction [53] and metasurface susceptibility derivation [6], complex (anisotropic, inhomogeneous, and chiral) materials [54][55][56], and extended to free-space configurations and even, acoustic platforms. The proposed concept sets a new stage for ε r and µ r determination in programmable time-modulated waveguides and may find the other potential applications such as efficient harmonic control for guided waves.…”

Section: Discussionmentioning

confidence: 99%

Time-modulated Measurements: Material Characterization Based on Scalar Reflection Data

Ghasemi,

Rajabalipanah,

Tayarani

et al. 2020

Preprint

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This paper explores the time-modulated waveguide setups for unique and accurate permittivity and permeability extraction of lossy dispersive samples with phase-less measurements. We theoretically demonstrate that when the position of the short-circuit termination is dynamically modulated in a predefined way, the phase information of the reflection S-parameter manifests itself into the amplitude level of the emerging harmonics. Being insensitive to the calibration plane shifts and phase uncertainties in reflection measurements while bypassing a priori knowledge about the material under test (MUT) and also the transmission coefficient, can be enumerated as the main advantages of the proposed time-modulated retrieval scheme. Moreover, the presented reconstruction algorithm offers a simple post-processing step to facilitate fast computations of εr and µr. Several illustrative examples at X-band frequencies have been presented to numerically verify the validity of the proposed approach for some applicable and practical types of homogeneous materials. Two possible realization and measurement configurations are suggested and discussed based on mechanical actuation and electrical phase control. We have also performed an uncertainty analysis to examine how the realization tolerances can affect the accuracy of results. By involving the temporal dimension, the proposed strategy takes a great step forwards in phase-less reconstruction of the electromagnetic parameters.

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Inhomogeneous media characterization: a hybrid method of state space and frequency diversity

Cited by 5 publications

References 31 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

Time‐Modulated Metasurface‐Assisted Measurements

Time-modulated Measurements: Material Characterization Based on Scalar Reflection Data

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