3-D Imaging of Inhomogeneous Materials Loaded in a Rectangular Waveguide

Kılıç, Emre; Akleman, Funda; Esen, Bayram; Ozaltin, Duygu Merve; Ozdemir, Özgür; Yapar, Ali

doi:10.1109/tmtt.2010.2045528

Cited by 20 publications

(16 citation statements)

References 25 publications

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“…Scattered field for the problem depicted in Fig. 1 can be formulated as [3] IS = iWJk, f C(;';:;)Je)dv' (1) rEI) 978-1-4673-4480-7/12/$31.00 ©2012 IEEE where G(r, r') and l(r) are the dyadic Green's function and volume current density function, respectively.…”

Section: Formulation Of Direct Scattering Problemmentioning

confidence: 99%

“…It is required to determine the electrical parameters of arbitrarily shaped, inhomogeneous lossy dielectrics in a wide range of electromagnetic applications, such as fabrication of multilayered structures, non-destructive testing, biomedical applications, material test and measurements, microwave device analysis and design problems, etc [1]. It is possible to classify the solution techniques for the determination electrical parameters of a lossy dielectric into two basic categories as free space and waveguide methods.…”

mentioning

confidence: 99%

“…It is possible to classify the solution techniques for the determination electrical parameters of a lossy dielectric into two basic categories as free space and waveguide methods. In [1], it has been shown that a dyadic Green's function (DGF) based reconstruction algorithm is effective for the determination of three dimensional inhomogeneity of a lossy dielectric object loaded in a rectangular cross-section waveguide.…”

mentioning

confidence: 99%

“…In order to apply the similar approach used in [1], ftrst it is required to solve the direct scattering problem using dyadic Green's function of circular empty waveguide in order to validate the solution of the equation which is also used in the inverse algorithm. In literature, direct scattering problem is analyzed in circular waveguide for open metal objects [2] and to our knowledge, no existing research addresses the direct scattering problem for lossy dielectric objects, partially loaded in circular waveguide.…”

mentioning

confidence: 99%

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Validation of mom-based direct scattering analysis in circular waveguide for appropriate mesh-type decision

Aydoğan

Akleman

2012

2012 International Conference on Mathematical Methods in Electromagnetic Theory

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The general formulae and algorithms for direct scattering analysis of inhomogeneous lossy dielectric objects, arbitrarily loaded inside a circular waveguide is given by means of a dyadic Green's function (DGF) concept.The numerical results are based on the Method of Moments discretization for electric type DGF representation of empty circular waveguide. l. INTRODUCTIONIt is required to determine the electrical parameters of arbitrarily shaped, inhomogeneous lossy dielectrics in a wide range of electromagnetic applications, such as fabrication of multilayered structures, non-destructive testing, biomedical applications, material test and measurements, microwave device analysis and design problems, etc [1]. It is possible to classify the solution techniques for the determination electrical parameters of a lossy dielectric into two basic categories as free space and waveguide methods. In [1], it has been shown that a dyadic Green's function (DGF) based reconstruction algorithm is effective for the determination of three dimensional inhomogeneity of a lossy dielectric object loaded in a rectangular cross-section waveguide.In this study, a basis for a similar algorithm is proposed for the inhomogeneous objects loaded in circular waveguide. In order to apply the similar approach used in [1], ftrst it is required to solve the direct scattering problem using dyadic Green's function of circular empty waveguide in order to validate the solution of the equation which is also used in the inverse algorithm. In literature, direct scattering problem is analyzed in circular waveguide for open metal objects [2] and to our knowledge, no existing research addresses the direct scattering problem for lossy dielectric objects, partially loaded in circular waveguide.

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Section: Formulation Of Direct Scattering Problemmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Validation of mom-based direct scattering analysis in circular waveguide for appropriate mesh-type decision

Aydoğan

Akleman

2012

2012 International Conference on Mathematical Methods in Electromagnetic Theory

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“…Due to their relative simplicity, non-resonant waveguide coaxial transmission/reflection methods are presently the most widely used broadband measurement techniques [8]. Various non-resonant transmission-reflection methods have been proposed for electrical characterization of low-, medium-, and high-loss materials [9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

An Artificial Nerve Network Realization in the Measurement of Material Permittivity

Chen¹,

Huang²,

Yang³

et al. 2011

PIER

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Abstract-Effective complex permittivity measurements of materials are important in microwave engineering and microwave chemistry. Artificial neural network (ANN) computational module has been used in microwave technology and becomes a useful tool recently. A neural network can be trained to learn the behavior of an effective permittivity of material under microwave irradiation in a test system, and it can provide a fast and accurate result for the permittivity measurement of material. Thus, an on-line measurement has been realized. This paper presents a simple and convenient reconstruction algorithm for determining the dielectric properties of materials. First, a measurement system is designed, and the reflection coefficient is calculated by employing full-wave simulations. Second, an artificial nerve network has been applied, and adequate simulated materials are utilized to train the networks. Last, the trained network is employed to reconstruct the effective permittivity of several organic solvents using the measured scattering parameters, and the reconstructed results for several organic solvents agree well with reference data and the relative errors between them are less than 5%.

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Material characterization in partially filled waveguides using inverse scattering and multiple sample orientations

Sjöberg

Larsson

2015

Radio Sci.

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We present a method aimed at reducing uncertainties and instabilities when characterizing materials in waveguide setups. The method is based on measuring the S parameters for three different orientations of a rectangular sample block in a rectangular waveguide. The corresponding geometries are modeled in a commercial full-wave simulation program, taking any material parameters as input. The material parameters of the sample are found by minimizing the squared distance between measured and calculated S parameters. The information added by the different sample orientations is quantified using the Cramér-Rao lower bound. The flexibility of the method allows the determination of material parameters of an arbitrarily shaped sample that fits in the waveguide.

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3-D Imaging of Inhomogeneous Materials Loaded in a Rectangular Waveguide

Cited by 20 publications

References 25 publications

Validation of mom-based direct scattering analysis in circular waveguide for appropriate mesh-type decision

Validation of mom-based direct scattering analysis in circular waveguide for appropriate mesh-type decision

An Artificial Nerve Network Realization in the Measurement of Material Permittivity

Material characterization in partially filled waveguides using inverse scattering and multiple sample orientations

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